lp.c File Reference

Detailed Description

LP management methods and data structures.

Author

Tobias Achterberg

Timo Berthold

Marc Pfetsch

Kati Wolter

Gerald Gamrath

In LP management, we have to differ between the current LP and the SCIP_LP stored in the LP solver. All LP methods affect the current LP only. Before solving the current LP with the LP solver or setting an LP state, the LP solvers data has to be updated to the current LP with a call to lpFlush().

Definition in file lp.c.

#include "lpi/lpi.h"
#include "scip/clock.h"
#include "scip/cons.h"
#include "scip/event.h"
#include "scip/intervalarith.h"
#include "scip/lp.h"
#include "scip/misc.h"
#include "scip/prob.h"
#include "scip/pub_lp.h"
#include "scip/pub_message.h"
#include "scip/pub_misc.h"
#include "scip/pub_misc_sort.h"
#include "scip/pub_var.h"
#include "scip/set.h"
#include "scip/sol.h"
#include "scip/solve.h"
#include "scip/stat.h"
#include "scip/struct_event.h"
#include "scip/struct_lp.h"
#include "scip/struct_prob.h"
#include "scip/struct_set.h"
#include "scip/struct_stat.h"
#include "scip/struct_var.h"
#include "scip/var.h"
#include <string.h>

Go to the source code of this file.

Macros
#define	debugRowPrint(x, y)
#define	debugColPrint(x, y)
#define	checkRow(row)
#define	checkRowSqrnorm(row)
#define	checkRowSumnorm(row)
#define	checkRowObjprod(row)
#define	checkLinks(lp)
#define	lpCutoffDisabled(set)   (set->lp_disablecutoff == 1 || (set->nactivepricers > 0 && set->lp_disablecutoff == 2))
#define	DIVESTACKINITSIZE   100
#define	MAXNUMTROUBLELPMSGS   10
#define	FEASTOLTIGHTFAC   0.001
#define	DIVESTACKGROWFACT   1.5

Functions
static SCIP_RETCODE	ensureChgcolsSize (SCIP_LP *lp, SCIP_SET *set, int num)
static SCIP_RETCODE	ensureChgrowsSize (SCIP_LP *lp, SCIP_SET *set, int num)
static SCIP_RETCODE	ensureLpicolsSize (SCIP_LP *lp, SCIP_SET *set, int num)
static SCIP_RETCODE	ensureLpirowsSize (SCIP_LP *lp, SCIP_SET *set, int num)
static SCIP_RETCODE	ensureColsSize (SCIP_LP *lp, SCIP_SET *set, int num)
static SCIP_RETCODE	ensureSoldirectionSize (SCIP_LP *lp, int num)
static SCIP_RETCODE	ensureLazycolsSize (SCIP_LP *lp, SCIP_SET *set, int num)
static SCIP_RETCODE	ensureRowsSize (SCIP_LP *lp, SCIP_SET *set, int num)
static SCIP_RETCODE	colEnsureSize (SCIP_COL *col, BMS_BLKMEM *blkmem, SCIP_SET *set, int num)
static SCIP_RETCODE	lpStoreSolVals (SCIP_LP *lp, SCIP_STAT *stat, BMS_BLKMEM *blkmem)
static SCIP_RETCODE	lpRestoreSolVals (SCIP_LP *lp, BMS_BLKMEM *blkmem, SCIP_Longint validlp)
static SCIP_RETCODE	colStoreSolVals (SCIP_COL *col, BMS_BLKMEM *blkmem)
static SCIP_RETCODE	colRestoreSolVals (SCIP_COL *col, BMS_BLKMEM *blkmem, SCIP_Longint validlp, SCIP_Bool freebuffer)
static SCIP_RETCODE	rowStoreSolVals (SCIP_ROW *row, BMS_BLKMEM *blkmem, SCIP_Bool infeasible)
static SCIP_RETCODE	rowRestoreSolVals (SCIP_ROW *row, BMS_BLKMEM *blkmem, SCIP_Longint validlp, SCIP_Bool freebuffer, SCIP_Bool infeasible)
SCIP_RETCODE	SCIProwEnsureSize (SCIP_ROW *row, BMS_BLKMEM *blkmem, SCIP_SET *set, int num)
static void	recomputeLooseObjectiveValue (SCIP_LP *lp, SCIP_SET *set, SCIP_PROB *prob)
static void	recomputePseudoObjectiveValue (SCIP_LP *lp, SCIP_SET *set, SCIP_PROB *prob)
static void	recomputeGlbPseudoObjectiveValue (SCIP_LP *lp, SCIP_SET *set, SCIP_PROB *prob)
static SCIP_Real	getFiniteLooseObjval (SCIP_LP *lp, SCIP_SET *set, SCIP_PROB *prob)
static SCIP_Real	getFinitePseudoObjval (SCIP_LP *lp, SCIP_SET *set, SCIP_PROB *prob)
	SCIP_DECL_SORTPTRCOMP (SCIProwComp)
static void	colSortLP (SCIP_COL *col)
static void	colSortNonLP (SCIP_COL *col)
static void	rowSortLP (SCIP_ROW *row)
static void	rowSortNonLP (SCIP_ROW *row)
static int	colSearchCoefPart (SCIP_COL *col, const SCIP_ROW *row, int minpos, int maxpos)
static int	colSearchCoef (SCIP_COL *col, const SCIP_ROW *row)
static int	rowSearchCoefPart (SCIP_ROW *row, const SCIP_COL *col, int minpos, int maxpos)
static int	rowSearchCoef (SCIP_ROW *row, const SCIP_COL *col)
static void	colMoveCoef (SCIP_COL *col, int oldpos, int newpos)
static void	colSwapCoefs (SCIP_COL *col, int pos1, int pos2)
static void	rowMoveCoef (SCIP_ROW *row, int oldpos, int newpos)
static void	rowSwapCoefs (SCIP_ROW *row, int pos1, int pos2)
static SCIP_RETCODE	rowEventCoefChanged (SCIP_ROW *row, BMS_BLKMEM *blkmem, SCIP_SET *set, SCIP_EVENTQUEUE *eventqueue, SCIP_COL *col, SCIP_Real oldval, SCIP_Real newval)
static SCIP_RETCODE	rowEventConstantChanged (SCIP_ROW *row, BMS_BLKMEM *blkmem, SCIP_SET *set, SCIP_EVENTQUEUE *eventqueue, SCIP_Real oldval, SCIP_Real newval)
static SCIP_RETCODE	rowEventSideChanged (SCIP_ROW *row, BMS_BLKMEM *blkmem, SCIP_SET *set, SCIP_EVENTQUEUE *eventqueue, SCIP_SIDETYPE side, SCIP_Real oldval, SCIP_Real newval)
static void	coefChanged (SCIP_ROW *row, SCIP_COL *col, SCIP_LP *lp)
static SCIP_RETCODE	rowAddCoef (SCIP_ROW *row, BMS_BLKMEM *blkmem, SCIP_SET *set, SCIP_EVENTQUEUE *eventqueue, SCIP_LP *lp, SCIP_COL *col, SCIP_Real val, int linkpos)
static SCIP_RETCODE	colAddCoef (SCIP_COL *col, BMS_BLKMEM *blkmem, SCIP_SET *set, SCIP_EVENTQUEUE *eventqueue, SCIP_LP *lp, SCIP_ROW *row, SCIP_Real val, int linkpos)
static SCIP_RETCODE	colDelCoefPos (SCIP_COL *col, SCIP_SET *set, SCIP_LP *lp, int pos)
static SCIP_RETCODE	colChgCoefPos (SCIP_COL *col, SCIP_SET *set, SCIP_LP *lp, int pos, SCIP_Real val)
static void	rowAddNorms (SCIP_ROW *row, SCIP_SET *set, SCIP_COL *col, SCIP_Real val, SCIP_Bool updateidxvals)
static void	rowDelNorms (SCIP_ROW *row, SCIP_SET *set, SCIP_COL *col, SCIP_Real val, SCIP_Bool forcenormupdate, SCIP_Bool updateindex, SCIP_Bool updateval)
static SCIP_RETCODE	rowDelCoefPos (SCIP_ROW *row, BMS_BLKMEM *blkmem, SCIP_SET *set, SCIP_EVENTQUEUE *eventqueue, SCIP_LP *lp, int pos)
static SCIP_RETCODE	rowChgCoefPos (SCIP_ROW *row, BMS_BLKMEM *blkmem, SCIP_SET *set, SCIP_EVENTQUEUE *eventqueue, SCIP_LP *lp, int pos, SCIP_Real val)
static SCIP_RETCODE	rowSideChanged (SCIP_ROW *row, SCIP_SET *set, SCIP_LP *lp, SCIP_SIDETYPE sidetype)
static SCIP_RETCODE	colLink (SCIP_COL *col, BMS_BLKMEM *blkmem, SCIP_SET *set, SCIP_EVENTQUEUE *eventqueue, SCIP_LP *lp)
static SCIP_RETCODE	colUnlink (SCIP_COL *col, BMS_BLKMEM *blkmem, SCIP_SET *set, SCIP_EVENTQUEUE *eventqueue, SCIP_LP *lp)
static SCIP_RETCODE	rowLink (SCIP_ROW *row, BMS_BLKMEM *blkmem, SCIP_SET *set, SCIP_EVENTQUEUE *eventqueue, SCIP_LP *lp)
static SCIP_RETCODE	rowUnlink (SCIP_ROW *row, SCIP_SET *set, SCIP_LP *lp)
static SCIP_RETCODE	lpSetIntpar (SCIP_LP *lp, SCIP_LPPARAM lpparam, int value, SCIP_Bool *success)
static SCIP_RETCODE	lpSetBoolpar (SCIP_LP *lp, SCIP_LPPARAM lpparam, SCIP_Bool value, SCIP_Bool *success)
static SCIP_RETCODE	lpSetRealpar (SCIP_LP *lp, SCIP_LPPARAM lpparam, SCIP_Real value, SCIP_Bool *success)
static SCIP_RETCODE	lpCheckIntpar (SCIP_LP *lp, SCIP_LPPARAM lpparam, int value)
static SCIP_RETCODE	lpCheckBoolpar (SCIP_LP *lp, SCIP_LPPARAM lpparam, SCIP_Bool value)
static SCIP_RETCODE	lpCheckRealpar (SCIP_LP *lp, SCIP_LPPARAM lpparam, SCIP_Real value)
static SCIP_RETCODE	lpSetObjlim (SCIP_LP *lp, SCIP_SET *set, SCIP_Real objlim, SCIP_Bool *success)
static SCIP_RETCODE	lpSetFeastol (SCIP_LP *lp, SCIP_Real feastol, SCIP_Bool *success)
static SCIP_RETCODE	lpSetDualfeastol (SCIP_LP *lp, SCIP_Real dualfeastol, SCIP_Bool *success)
static SCIP_RETCODE	lpSetBarrierconvtol (SCIP_LP *lp, SCIP_Real barrierconvtol, SCIP_Bool *success)
static SCIP_RETCODE	lpSetFromscratch (SCIP_LP *lp, SCIP_Bool fromscratch, SCIP_Bool *success)
static SCIP_RETCODE	lpSetFastmip (SCIP_LP *lp, int fastmip, SCIP_Bool *success)
static SCIP_RETCODE	lpSetScaling (SCIP_LP *lp, int scaling, SCIP_Bool *success)
static SCIP_RETCODE	lpSetThreads (SCIP_LP *lp, int threads, SCIP_Bool *success)
static SCIP_RETCODE	lpSetPresolving (SCIP_LP *lp, SCIP_Bool presolving, SCIP_Bool *success)
static SCIP_RETCODE	lpSetRowrepswitch (SCIP_LP *lp, SCIP_Real rowrepswitch, SCIP_Bool *success)
static SCIP_RETCODE	lpSetIterationLimit (SCIP_LP *lp, int itlim)
static SCIP_RETCODE	lpSetPricing (SCIP_LP *lp, SCIP_PRICING pricing)
static SCIP_RETCODE	lpSetPricingChar (SCIP_LP *lp, char pricingchar)
static SCIP_RETCODE	lpSetLPInfo (SCIP_LP *lp, SCIP_Bool lpinfo)
static SCIP_RETCODE	lpSetConditionLimit (SCIP_LP *lp, SCIP_Real condlimit, SCIP_Bool *success)
static SCIP_RETCODE	lpSetMarkowitz (SCIP_LP *lp, SCIP_Real threshhold, SCIP_Bool *success)
static SCIP_RETCODE	lpSetTiming (SCIP_LP *lp, SCIP_CLOCKTYPE timing, SCIP_Bool enabled, SCIP_Bool *success)
static SCIP_RETCODE	lpSetRandomseed (SCIP_LP *lp, int randomseed, SCIP_Bool *success)
static SCIP_RETCODE	lpSetSolutionPolishing (SCIP_LP *lp, SCIP_Bool polishing, SCIP_Bool *success)
static SCIP_RETCODE	lpSetRefactorInterval (SCIP_LP *lp, int refactor, SCIP_Bool *success)
SCIP_RETCODE	SCIPcolCreate (SCIP_COL **col, BMS_BLKMEM *blkmem, SCIP_SET *set, SCIP_STAT *stat, SCIP_VAR *var, int len, SCIP_ROW **rows, SCIP_Real *vals, SCIP_Bool removable)
SCIP_RETCODE	SCIPcolFree (SCIP_COL **col, BMS_BLKMEM *blkmem, SCIP_SET *set, SCIP_EVENTQUEUE *eventqueue, SCIP_LP *lp)
void	SCIPcolPrint (SCIP_COL *col, SCIP_MESSAGEHDLR *messagehdlr, FILE *file)
void	SCIPcolSort (SCIP_COL *col)
SCIP_RETCODE	SCIPcolAddCoef (SCIP_COL *col, BMS_BLKMEM *blkmem, SCIP_SET *set, SCIP_EVENTQUEUE *eventqueue, SCIP_LP *lp, SCIP_ROW *row, SCIP_Real val)
SCIP_RETCODE	SCIPcolDelCoef (SCIP_COL *col, BMS_BLKMEM *blkmem, SCIP_SET *set, SCIP_EVENTQUEUE *eventqueue, SCIP_LP *lp, SCIP_ROW *row)
SCIP_RETCODE	SCIPcolChgCoef (SCIP_COL *col, BMS_BLKMEM *blkmem, SCIP_SET *set, SCIP_EVENTQUEUE *eventqueue, SCIP_LP *lp, SCIP_ROW *row, SCIP_Real val)
SCIP_RETCODE	SCIPcolIncCoef (SCIP_COL *col, BMS_BLKMEM *blkmem, SCIP_SET *set, SCIP_EVENTQUEUE *eventqueue, SCIP_LP *lp, SCIP_ROW *row, SCIP_Real incval)
static SCIP_RETCODE	insertColChgcols (SCIP_COL *col, SCIP_SET *set, SCIP_LP *lp)
static SCIP_Bool	isNewValueUnreliable (SCIP_SET *set, SCIP_Real newvalue, SCIP_Real oldvalue)
static void	lpUpdateObjNorms (SCIP_LP *lp, SCIP_SET *set, SCIP_Real oldobj, SCIP_Real newobj)
SCIP_RETCODE	SCIPcolChgObj (SCIP_COL *col, SCIP_SET *set, SCIP_LP *lp, SCIP_Real newobj)
SCIP_RETCODE	SCIPcolChgLb (SCIP_COL *col, SCIP_SET *set, SCIP_LP *lp, SCIP_Real newlb)
SCIP_RETCODE	SCIPcolChgUb (SCIP_COL *col, SCIP_SET *set, SCIP_LP *lp, SCIP_Real newub)
SCIP_Real	SCIPcolCalcRedcost (SCIP_COL *col, SCIP_Real *dualsol)
static SCIP_Real	colCalcInternalRedcost (SCIP_COL *col)
SCIP_Real	SCIPcolGetRedcost (SCIP_COL *col, SCIP_STAT *stat, SCIP_LP *lp)
SCIP_Real	SCIPcolGetFeasibility (SCIP_COL *col, SCIP_SET *set, SCIP_STAT *stat, SCIP_LP *lp)
SCIP_Real	SCIPcolCalcFarkasCoef (SCIP_COL *col, SCIP_Real *dualfarkas)
static SCIP_Real	colCalcInternalFarkasCoef (SCIP_COL *col)
SCIP_Real	SCIPcolGetFarkasCoef (SCIP_COL *col, SCIP_STAT *stat, SCIP_LP *lp)
SCIP_Real	SCIPcolGetFarkasValue (SCIP_COL *col, SCIP_STAT *stat, SCIP_LP *lp)
SCIP_RETCODE	SCIPlpStartStrongbranch (SCIP_LP *lp)
SCIP_RETCODE	SCIPlpEndStrongbranch (SCIP_LP *lp)
void	SCIPcolSetStrongbranchData (SCIP_COL *col, SCIP_SET *set, SCIP_STAT *stat, SCIP_LP *lp, SCIP_Real lpobjval, SCIP_Real primsol, SCIP_Real sbdown, SCIP_Real sbup, SCIP_Bool sbdownvalid, SCIP_Bool sbupvalid, SCIP_Longint iter, int itlim)
void	SCIPcolInvalidateStrongbranchData (SCIP_COL *col, SCIP_SET *set, SCIP_STAT *stat, SCIP_LP *lp)
SCIP_RETCODE	SCIPcolGetStrongbranch (SCIP_COL *col, SCIP_Bool integral, SCIP_SET *set, SCIP_STAT *stat, SCIP_PROB *prob, SCIP_LP *lp, int itlim, SCIP_Bool updatecol, SCIP_Bool updatestat, SCIP_Real *down, SCIP_Real *up, SCIP_Bool *downvalid, SCIP_Bool *upvalid, SCIP_Bool *lperror)
SCIP_RETCODE	SCIPcolGetStrongbranches (SCIP_COL **cols, int ncols, SCIP_Bool integral, SCIP_SET *set, SCIP_STAT *stat, SCIP_PROB *prob, SCIP_LP *lp, int itlim, SCIP_Real *down, SCIP_Real *up, SCIP_Bool *downvalid, SCIP_Bool *upvalid, SCIP_Bool *lperror)
void	SCIPcolGetStrongbranchLast (SCIP_COL *col, SCIP_Real *down, SCIP_Real *up, SCIP_Bool *downvalid, SCIP_Bool *upvalid, SCIP_Real *solval, SCIP_Real *lpobjval)
SCIP_Longint	SCIPcolGetStrongbranchLPAge (SCIP_COL *col, SCIP_STAT *stat)
void	SCIPcolMarkNotRemovableLocal (SCIP_COL *col, SCIP_STAT *stat)
static void	rowCalcNorms (SCIP_ROW *row, SCIP_SET *set)
static void	rowCalcIdxsAndVals (SCIP_ROW *row, SCIP_SET *set)
static SCIP_Bool	isIntegralScalar (SCIP_Real val, SCIP_Real scalar, SCIP_Real mindelta, SCIP_Real maxdelta, SCIP_Real *intval)
static SCIP_RETCODE	rowScale (SCIP_ROW *row, BMS_BLKMEM *blkmem, SCIP_SET *set, SCIP_EVENTQUEUE *eventqueue, SCIP_STAT *stat, SCIP_LP *lp, SCIP_Real scaleval, SCIP_Bool integralcontvars, SCIP_Real minrounddelta, SCIP_Real maxrounddelta)
SCIP_RETCODE	SCIProwCreate (SCIP_ROW **row, BMS_BLKMEM *blkmem, SCIP_SET *set, SCIP_STAT *stat, const char *name, int len, SCIP_COL **cols, SCIP_Real *vals, SCIP_Real lhs, SCIP_Real rhs, SCIP_ROWORIGINTYPE origintype, void *origin, SCIP_Bool local, SCIP_Bool modifiable, SCIP_Bool removable)
SCIP_RETCODE	SCIProwFree (SCIP_ROW **row, BMS_BLKMEM *blkmem, SCIP_SET *set, SCIP_LP *lp)
void	SCIProwPrint (SCIP_ROW *row, SCIP_MESSAGEHDLR *messagehdlr, FILE *file)
void	SCIProwCapture (SCIP_ROW *row)
SCIP_RETCODE	SCIProwRelease (SCIP_ROW **row, BMS_BLKMEM *blkmem, SCIP_SET *set, SCIP_LP *lp)
void	SCIProwLock (SCIP_ROW *row)
void	SCIProwUnlock (SCIP_ROW *row)
SCIP_RETCODE	SCIProwAddCoef (SCIP_ROW *row, BMS_BLKMEM *blkmem, SCIP_SET *set, SCIP_EVENTQUEUE *eventqueue, SCIP_LP *lp, SCIP_COL *col, SCIP_Real val)
SCIP_RETCODE	SCIProwDelCoef (SCIP_ROW *row, BMS_BLKMEM *blkmem, SCIP_SET *set, SCIP_EVENTQUEUE *eventqueue, SCIP_LP *lp, SCIP_COL *col)
SCIP_RETCODE	SCIProwChgCoef (SCIP_ROW *row, BMS_BLKMEM *blkmem, SCIP_SET *set, SCIP_EVENTQUEUE *eventqueue, SCIP_LP *lp, SCIP_COL *col, SCIP_Real val)
SCIP_RETCODE	SCIProwIncCoef (SCIP_ROW *row, BMS_BLKMEM *blkmem, SCIP_SET *set, SCIP_EVENTQUEUE *eventqueue, SCIP_LP *lp, SCIP_COL *col, SCIP_Real incval)
SCIP_RETCODE	SCIProwChgConstant (SCIP_ROW *row, BMS_BLKMEM *blkmem, SCIP_SET *set, SCIP_STAT *stat, SCIP_EVENTQUEUE *eventqueue, SCIP_LP *lp, SCIP_Real constant)
SCIP_RETCODE	SCIProwAddConstant (SCIP_ROW *row, BMS_BLKMEM *blkmem, SCIP_SET *set, SCIP_STAT *stat, SCIP_EVENTQUEUE *eventqueue, SCIP_LP *lp, SCIP_Real addval)
SCIP_RETCODE	SCIProwChgLhs (SCIP_ROW *row, BMS_BLKMEM *blkmem, SCIP_SET *set, SCIP_EVENTQUEUE *eventqueue, SCIP_LP *lp, SCIP_Real lhs)
SCIP_RETCODE	SCIProwChgRhs (SCIP_ROW *row, BMS_BLKMEM *blkmem, SCIP_SET *set, SCIP_EVENTQUEUE *eventqueue, SCIP_LP *lp, SCIP_Real rhs)
SCIP_RETCODE	SCIProwChgLocal (SCIP_ROW *row, SCIP_Bool local)
SCIP_RETCODE	SCIProwCalcIntegralScalar (SCIP_ROW *row, SCIP_SET *set, SCIP_Real mindelta, SCIP_Real maxdelta, SCIP_Longint maxdnom, SCIP_Real maxscale, SCIP_Bool usecontvars, SCIP_Real *intscalar, SCIP_Bool *success)
SCIP_RETCODE	SCIProwMakeIntegral (SCIP_ROW *row, BMS_BLKMEM *blkmem, SCIP_SET *set, SCIP_EVENTQUEUE *eventqueue, SCIP_STAT *stat, SCIP_LP *lp, SCIP_Real mindelta, SCIP_Real maxdelta, SCIP_Longint maxdnom, SCIP_Real maxscale, SCIP_Bool usecontvars, SCIP_Bool *success)
void	SCIProwSort (SCIP_ROW *row)
static void	rowMerge (SCIP_ROW *row, SCIP_SET *set)
void	SCIProwDelaySort (SCIP_ROW *row)
void	SCIProwForceSort (SCIP_ROW *row, SCIP_SET *set)
void	SCIProwRecalcLPActivity (SCIP_ROW *row, SCIP_STAT *stat)
SCIP_Real	SCIProwGetLPActivity (SCIP_ROW *row, SCIP_SET *set, SCIP_STAT *stat, SCIP_LP *lp)
SCIP_Real	SCIProwGetLPFeasibility (SCIP_ROW *row, SCIP_SET *set, SCIP_STAT *stat, SCIP_LP *lp)
SCIP_Real	SCIProwGetRelaxFeasibility (SCIP_ROW *row, SCIP_SET *set, SCIP_STAT *stat)
SCIP_Real	SCIProwGetNLPFeasibility (SCIP_ROW *row, SCIP_SET *set, SCIP_STAT *stat)
void	SCIProwRecalcPseudoActivity (SCIP_ROW *row, SCIP_STAT *stat)
SCIP_Real	SCIProwGetPseudoActivity (SCIP_ROW *row, SCIP_SET *set, SCIP_STAT *stat)
SCIP_Real	SCIProwGetPseudoFeasibility (SCIP_ROW *row, SCIP_SET *set, SCIP_STAT *stat)
SCIP_Real	SCIProwGetSolActivity (SCIP_ROW *row, SCIP_SET *set, SCIP_STAT *stat, SCIP_SOL *sol)
SCIP_Real	SCIProwGetSolFeasibility (SCIP_ROW *row, SCIP_SET *set, SCIP_STAT *stat, SCIP_SOL *sol)
static void	rowCalcActivityBounds (SCIP_ROW *row, SCIP_SET *set, SCIP_STAT *stat)
SCIP_Real	SCIProwGetMinActivity (SCIP_ROW *row, SCIP_SET *set, SCIP_STAT *stat)
SCIP_Real	SCIProwGetMaxActivity (SCIP_ROW *row, SCIP_SET *set, SCIP_STAT *stat)
SCIP_Bool	SCIProwIsRedundant (SCIP_ROW *row, SCIP_SET *set, SCIP_STAT *stat)
SCIP_Real	SCIProwGetMaxval (SCIP_ROW *row, SCIP_SET *set)
SCIP_Real	SCIProwGetMinval (SCIP_ROW *row, SCIP_SET *set)
int	SCIProwGetMaxidx (SCIP_ROW *row, SCIP_SET *set)
int	SCIProwGetMinidx (SCIP_ROW *row, SCIP_SET *set)
int	SCIProwGetNumIntCols (SCIP_ROW *row, SCIP_SET *set)
SCIP_Real	SCIProwGetLPSolCutoffDistance (SCIP_ROW *row, SCIP_SET *set, SCIP_STAT *stat, SCIP_SOL *sol, SCIP_LP *lp)
SCIP_Real	SCIProwGetLPEfficacy (SCIP_ROW *row, SCIP_SET *set, SCIP_STAT *stat, SCIP_LP *lp)
SCIP_Bool	SCIProwIsLPEfficacious (SCIP_ROW *row, SCIP_SET *set, SCIP_STAT *stat, SCIP_LP *lp, SCIP_Bool root)
SCIP_Real	SCIProwGetSolEfficacy (SCIP_ROW *row, SCIP_SET *set, SCIP_STAT *stat, SCIP_SOL *sol)
SCIP_Bool	SCIProwIsSolEfficacious (SCIP_ROW *row, SCIP_SET *set, SCIP_STAT *stat, SCIP_SOL *sol, SCIP_Bool root)
SCIP_Real	SCIProwGetRelaxEfficacy (SCIP_ROW *row, SCIP_SET *set, SCIP_STAT *stat)
SCIP_Real	SCIProwGetNLPEfficacy (SCIP_ROW *row, SCIP_SET *set, SCIP_STAT *stat)
SCIP_Real	SCIProwGetScalarProduct (SCIP_ROW *row1, SCIP_ROW *row2)
static int	SCIProwGetDiscreteScalarProduct (SCIP_ROW *row1, SCIP_ROW *row2)
SCIP_Real	SCIProwGetParallelism (SCIP_ROW *row1, SCIP_ROW *row2, char orthofunc)
SCIP_Real	SCIProwGetOrthogonality (SCIP_ROW *row1, SCIP_ROW *row2, char orthofunc)
SCIP_Real	SCIProwGetObjParallelism (SCIP_ROW *row, SCIP_SET *set, SCIP_LP *lp)
SCIP_RETCODE	SCIProwCatchEvent (SCIP_ROW *row, BMS_BLKMEM *blkmem, SCIP_SET *set, SCIP_EVENTTYPE eventtype, SCIP_EVENTHDLR *eventhdlr, SCIP_EVENTDATA *eventdata, int *filterpos)
SCIP_RETCODE	SCIProwDropEvent (SCIP_ROW *row, BMS_BLKMEM *blkmem, SCIP_SET *set, SCIP_EVENTTYPE eventtype, SCIP_EVENTHDLR *eventhdlr, SCIP_EVENTDATA *eventdata, int filterpos)
void	SCIProwMarkNotRemovableLocal (SCIP_ROW *row, SCIP_STAT *stat)
static void	markColDeleted (SCIP_COL *col)
static SCIP_RETCODE	lpFlushDelCols (SCIP_LP *lp)
static void	computeLPBounds (SCIP_LP *lp, SCIP_SET *set, SCIP_COL *col, SCIP_Real lpiinf, SCIP_Real *lb, SCIP_Real *ub)
static SCIP_RETCODE	lpFlushAddCols (SCIP_LP *lp, BMS_BLKMEM *blkmem, SCIP_SET *set, SCIP_EVENTQUEUE *eventqueue)
static void	markRowDeleted (SCIP_ROW *row)
static SCIP_RETCODE	lpFlushDelRows (SCIP_LP *lp, BMS_BLKMEM *blkmem, SCIP_SET *set)
static SCIP_RETCODE	lpFlushAddRows (SCIP_LP *lp, BMS_BLKMEM *blkmem, SCIP_SET *set, SCIP_EVENTQUEUE *eventqueue)
static SCIP_RETCODE	lpFlushChgCols (SCIP_LP *lp, SCIP_SET *set)
static SCIP_RETCODE	lpFlushChgRows (SCIP_LP *lp, SCIP_SET *set)
static SCIP_RETCODE	lpCopyIntegrality (SCIP_LP *lp, SCIP_SET *set)
SCIP_RETCODE	SCIPlpFlush (SCIP_LP *lp, BMS_BLKMEM *blkmem, SCIP_SET *set, SCIP_EVENTQUEUE *eventqueue)
SCIP_RETCODE	SCIPlpMarkFlushed (SCIP_LP *lp, SCIP_SET *set)
static void	colUpdateAddLP (SCIP_COL *col, SCIP_SET *set)
static void	rowUpdateAddLP (SCIP_ROW *row)
static void	colUpdateDelLP (SCIP_COL *col, SCIP_SET *set)
static void	rowUpdateDelLP (SCIP_ROW *row)
static SCIP_RETCODE	allocDiveChgSideArrays (SCIP_LP *lp, int initsize)
static SCIP_RETCODE	reallocDiveChgSideArrays (SCIP_LP *lp, int minsize, SCIP_Real growfact)
static void	freeDiveChgSideArrays (SCIP_LP *lp)
SCIP_RETCODE	SCIPlpCreate (SCIP_LP **lp, SCIP_SET *set, SCIP_MESSAGEHDLR *messagehdlr, SCIP_STAT *stat, const char *name)
SCIP_RETCODE	SCIPlpFree (SCIP_LP **lp, BMS_BLKMEM *blkmem, SCIP_SET *set, SCIP_EVENTQUEUE *eventqueue, SCIP_EVENTFILTER *eventfilter)
SCIP_RETCODE	SCIPlpReset (SCIP_LP *lp, BMS_BLKMEM *blkmem, SCIP_SET *set, SCIP_STAT *stat, SCIP_EVENTQUEUE *eventqueue, SCIP_EVENTFILTER *eventfilter)
SCIP_RETCODE	SCIPlpAddCol (SCIP_LP *lp, SCIP_SET *set, SCIP_COL *col, int depth)
SCIP_RETCODE	SCIPlpAddRow (SCIP_LP *lp, BMS_BLKMEM *blkmem, SCIP_SET *set, SCIP_EVENTQUEUE *eventqueue, SCIP_EVENTFILTER *eventfilter, SCIP_ROW *row, int depth)
static void	checkLazyColArray (SCIP_LP *lp, SCIP_SET *set)
SCIP_RETCODE	SCIPlpShrinkCols (SCIP_LP *lp, SCIP_SET *set, int newncols)
SCIP_RETCODE	SCIPlpShrinkRows (SCIP_LP *lp, BMS_BLKMEM *blkmem, SCIP_SET *set, SCIP_EVENTQUEUE *eventqueue, SCIP_EVENTFILTER *eventfilter, int newnrows)
SCIP_RETCODE	SCIPlpClear (SCIP_LP *lp, BMS_BLKMEM *blkmem, SCIP_SET *set, SCIP_EVENTQUEUE *eventqueue, SCIP_EVENTFILTER *eventfilter)
void	SCIPlpMarkSize (SCIP_LP *lp)
void	SCIPlpSetSizeMark (SCIP_LP *lp, int nrows, int ncols)
SCIP_RETCODE	SCIPlpGetBasisInd (SCIP_LP *lp, int *basisind)
SCIP_RETCODE	SCIPlpGetBase (SCIP_LP *lp, int *cstat, int *rstat)
SCIP_RETCODE	SCIPlpGetBInvRow (SCIP_LP *lp, int r, SCIP_Real *coef, int *inds, int *ninds)
SCIP_RETCODE	SCIPlpGetBInvCol (SCIP_LP *lp, int c, SCIP_Real *coef, int *inds, int *ninds)
SCIP_RETCODE	SCIPlpGetBInvARow (SCIP_LP *lp, int r, SCIP_Real *binvrow, SCIP_Real *coef, int *inds, int *ninds)
SCIP_RETCODE	SCIPlpGetBInvACol (SCIP_LP *lp, int c, SCIP_Real *coef, int *inds, int *ninds)
SCIP_RETCODE	SCIPlpSumRows (SCIP_LP *lp, SCIP_SET *set, SCIP_PROB *prob, SCIP_Real *weights, SCIP_REALARRAY *sumcoef, SCIP_Real *sumlhs, SCIP_Real *sumrhs)
SCIP_RETCODE	SCIPlpGetState (SCIP_LP *lp, BMS_BLKMEM *blkmem, SCIP_LPISTATE **lpistate)
SCIP_RETCODE	SCIPlpSetState (SCIP_LP *lp, BMS_BLKMEM *blkmem, SCIP_SET *set, SCIP_EVENTQUEUE *eventqueue, SCIP_LPISTATE *lpistate, SCIP_Bool wasprimfeas, SCIP_Bool wasprimchecked, SCIP_Bool wasdualfeas, SCIP_Bool wasdualchecked)
SCIP_RETCODE	SCIPlpFreeState (SCIP_LP *lp, BMS_BLKMEM *blkmem, SCIP_LPISTATE **lpistate)
SCIP_RETCODE	SCIPlpGetNorms (SCIP_LP *lp, BMS_BLKMEM *blkmem, SCIP_LPINORMS **lpinorms)
SCIP_RETCODE	SCIPlpSetNorms (SCIP_LP *lp, BMS_BLKMEM *blkmem, SCIP_LPINORMS *lpinorms)
SCIP_RETCODE	SCIPlpFreeNorms (SCIP_LP *lp, BMS_BLKMEM *blkmem, SCIP_LPINORMS **lpinorms)
SCIP_Real	SCIPlpGetCutoffbound (SCIP_LP *lp)
SCIP_RETCODE	SCIPlpSetCutoffbound (SCIP_LP *lp, SCIP_SET *set, SCIP_PROB *prob, SCIP_Real cutoffbound)
SCIP_Real	SCIPlpGetFeastol (SCIP_LP *lp)
void	SCIPlpSetFeastol (SCIP_LP *lp, SCIP_SET *set, SCIP_Real newfeastol)
void	SCIPlpResetFeastol (SCIP_LP *lp, SCIP_SET *set)
static const char *	lpalgoName (SCIP_LPALGO lpalgo)
static SCIP_RETCODE	lpPrimalSimplex (SCIP_LP *lp, SCIP_SET *set, SCIP_STAT *stat, SCIP_Bool resolve, SCIP_Bool keepsol, SCIP_Bool instable, SCIP_Bool *lperror)
static SCIP_RETCODE	lpDualSimplex (SCIP_LP *lp, SCIP_SET *set, SCIP_STAT *stat, SCIP_Bool resolve, SCIP_Bool keepsol, SCIP_Bool instable, SCIP_Bool *lperror)
static SCIP_RETCODE	lpLexDualSimplex (SCIP_LP *lp, SCIP_SET *set, SCIP_STAT *stat, SCIP_Bool resolve, SCIP_Bool keepsol, SCIP_Bool *lperror)
static SCIP_RETCODE	lpBarrier (SCIP_LP *lp, SCIP_SET *set, SCIP_STAT *stat, SCIP_Bool crossover, SCIP_Bool keepsol, SCIP_Bool *lperror)
static SCIP_RETCODE	lpAlgorithm (SCIP_LP *lp, SCIP_SET *set, SCIP_STAT *stat, SCIP_LPALGO lpalgo, SCIP_Bool resolve, SCIP_Bool keepsol, SCIP_Bool instable, SCIP_Bool *timelimit, SCIP_Bool *lperror)
static void	lpNumericalTroubleMessage (SCIP_MESSAGEHDLR *messagehdlr, SCIP_SET *set, SCIP_STAT *stat, SCIP_VERBLEVEL verblevel, const char *formatstr,...)
static SCIP_RETCODE	ignoreInstability (SCIP_LP *lp, SCIP_SET *set, SCIP_MESSAGEHDLR *messagehdlr, SCIP_STAT *stat, SCIP_LPALGO lpalgo, SCIP_Bool *success)
static SCIP_RETCODE	lpSolveStable (SCIP_LP *lp, SCIP_SET *set, SCIP_MESSAGEHDLR *messagehdlr, SCIP_STAT *stat, SCIP_PROB *prob, SCIP_LPALGO lpalgo, int itlim, int harditlim, SCIP_Bool resolve, int fastmip, SCIP_Bool tightprimfeastol, SCIP_Bool tightdualfeastol, SCIP_Bool fromscratch, SCIP_Bool keepsol, SCIP_Bool *timelimit, SCIP_Bool *lperror)
static void	adjustLPobjval (SCIP_LP *lp, SCIP_SET *set, SCIP_MESSAGEHDLR *messagehdlr)
static SCIP_RETCODE	lpSolve (SCIP_LP *lp, SCIP_SET *set, SCIP_MESSAGEHDLR *messagehdlr, SCIP_STAT *stat, SCIP_PROB *prob, SCIP_LPALGO lpalgo, int resolveitlim, int harditlim, SCIP_Bool needprimalray, SCIP_Bool needdualray, SCIP_Bool resolve, int fastmip, SCIP_Bool tightprimfeastol, SCIP_Bool tightdualfeastol, SCIP_Bool fromscratch, SCIP_Bool keepsol, SCIP_Bool *lperror)
static SCIP_RETCODE	lpFlushAndSolve (SCIP_LP *lp, BMS_BLKMEM *blkmem, SCIP_SET *set, SCIP_MESSAGEHDLR *messagehdlr, SCIP_STAT *stat, SCIP_PROB *prob, SCIP_EVENTQUEUE *eventqueue, int resolveitlim, int harditlim, SCIP_Bool needprimalray, SCIP_Bool needdualray, int fastmip, SCIP_Bool tightprimfeastol, SCIP_Bool tightdualfeastol, SCIP_Bool fromscratch, SCIP_Bool keepsol, SCIP_Bool *lperror)
static void	checkLazyBounds (SCIP_LP *lp, SCIP_SET *set)
static SCIP_RETCODE	updateLazyBounds (SCIP_LP *lp, SCIP_SET *set)
static int	lpGetResolveItlim (SCIP_SET *set, SCIP_STAT *stat, int itlim)
SCIP_RETCODE	SCIPlpSolveAndEval (SCIP_LP *lp, SCIP_SET *set, SCIP_MESSAGEHDLR *messagehdlr, BMS_BLKMEM *blkmem, SCIP_STAT *stat, SCIP_EVENTQUEUE *eventqueue, SCIP_EVENTFILTER *eventfilter, SCIP_PROB *prob, SCIP_Longint itlim, SCIP_Bool limitresolveiters, SCIP_Bool aging, SCIP_Bool keepsol, SCIP_Bool *lperror)
SCIP_LPSOLSTAT	SCIPlpGetSolstat (SCIP_LP *lp)
SCIP_Real	SCIPlpGetObjval (SCIP_LP *lp, SCIP_SET *set, SCIP_PROB *prob)
SCIP_Real	SCIPlpGetColumnObjval (SCIP_LP *lp)
SCIP_Real	SCIPlpGetLooseObjval (SCIP_LP *lp, SCIP_SET *set, SCIP_PROB *prob)
void	SCIPlpStoreRootObjval (SCIP_LP *lp, SCIP_SET *set, SCIP_PROB *prob)
void	SCIPlpInvalidateRootObjval (SCIP_LP *lp)
void	SCIPlpRecomputeLocalAndGlobalPseudoObjval (SCIP_LP *lp, SCIP_SET *set, SCIP_PROB *prob)
SCIP_Real	SCIPlpGetGlobalPseudoObjval (SCIP_LP *lp, SCIP_SET *set, SCIP_PROB *prob)
SCIP_Real	SCIPlpGetPseudoObjval (SCIP_LP *lp, SCIP_SET *set, SCIP_PROB *prob)
SCIP_Real	SCIPlpGetModifiedPseudoObjval (SCIP_LP *lp, SCIP_SET *set, SCIP_PROB *prob, SCIP_VAR *var, SCIP_Real oldbound, SCIP_Real newbound, SCIP_BOUNDTYPE boundtype)
SCIP_Real	SCIPlpGetModifiedProvedPseudoObjval (SCIP_LP *lp, SCIP_SET *set, SCIP_VAR *var, SCIP_Real oldbound, SCIP_Real newbound, SCIP_BOUNDTYPE boundtype)
static void	getObjvalDeltaObj (SCIP_SET *set, SCIP_Real oldobj, SCIP_Real newobj, SCIP_Real lb, SCIP_Real ub, SCIP_Real *deltaval, int *deltainf)
static void	getObjvalDeltaLb (SCIP_SET *set, SCIP_Real obj, SCIP_Real oldlb, SCIP_Real newlb, SCIP_Real *deltaval, int *deltainf)
static void	getObjvalDeltaUb (SCIP_SET *set, SCIP_Real obj, SCIP_Real oldub, SCIP_Real newub, SCIP_Real *deltaval, int *deltainf)
static void	lpUpdateObjval (SCIP_LP *lp, SCIP_SET *set, SCIP_VAR *var, SCIP_Real deltaval, int deltainf, SCIP_Bool local, SCIP_Bool loose, SCIP_Bool global)
static SCIP_RETCODE	lpUpdateVarProved (SCIP_LP *lp, SCIP_SET *set, SCIP_VAR *var, SCIP_Real oldobj, SCIP_Real oldlb, SCIP_Real oldub, SCIP_Real newobj, SCIP_Real newlb, SCIP_Real newub)
SCIP_RETCODE	SCIPlpUpdateVarObj (SCIP_LP *lp, SCIP_SET *set, SCIP_VAR *var, SCIP_Real oldobj, SCIP_Real newobj)
SCIP_RETCODE	SCIPlpUpdateVarLbGlobal (SCIP_LP *lp, SCIP_SET *set, SCIP_VAR *var, SCIP_Real oldlb, SCIP_Real newlb)
SCIP_RETCODE	SCIPlpUpdateVarLb (SCIP_LP *lp, SCIP_SET *set, SCIP_VAR *var, SCIP_Real oldlb, SCIP_Real newlb)
SCIP_RETCODE	SCIPlpUpdateVarUbGlobal (SCIP_LP *lp, SCIP_SET *set, SCIP_VAR *var, SCIP_Real oldub, SCIP_Real newub)
SCIP_RETCODE	SCIPlpUpdateVarUb (SCIP_LP *lp, SCIP_SET *set, SCIP_VAR *var, SCIP_Real oldub, SCIP_Real newub)
SCIP_RETCODE	SCIPlpUpdateAddVar (SCIP_LP *lp, SCIP_SET *set, SCIP_VAR *var)
SCIP_RETCODE	SCIPlpUpdateDelVar (SCIP_LP *lp, SCIP_SET *set, SCIP_VAR *var)
static SCIP_RETCODE	lpUpdateVarColumn (SCIP_LP *lp, SCIP_SET *set, SCIP_VAR *var)
static SCIP_RETCODE	lpUpdateVarColumnProved (SCIP_LP *lp, SCIP_SET *set, SCIP_VAR *var)
SCIP_RETCODE	SCIPlpUpdateVarColumn (SCIP_LP *lp, SCIP_SET *set, SCIP_VAR *var)
static SCIP_RETCODE	lpUpdateVarLoose (SCIP_LP *lp, SCIP_SET *set, SCIP_VAR *var)
static SCIP_RETCODE	lpUpdateVarLooseProved (SCIP_LP *lp, SCIP_SET *set, SCIP_VAR *var)
SCIP_RETCODE	SCIPlpUpdateVarLoose (SCIP_LP *lp, SCIP_SET *set, SCIP_VAR *var)
void	SCIPlpDecNLoosevars (SCIP_LP *lp)
SCIP_RETCODE	SCIPlpGetSol (SCIP_LP *lp, SCIP_SET *set, SCIP_STAT *stat, SCIP_Bool *primalfeasible, SCIP_Bool *dualfeasible)
SCIP_RETCODE	SCIPlpGetUnboundedSol (SCIP_LP *lp, SCIP_SET *set, SCIP_STAT *stat, SCIP_Bool *primalfeasible, SCIP_Bool *rayfeasible)
SCIP_RETCODE	SCIPlpGetPrimalRay (SCIP_LP *lp, SCIP_SET *set, SCIP_Real *ray)
SCIP_RETCODE	SCIPlpGetDualfarkas (SCIP_LP *lp, SCIP_SET *set, SCIP_STAT *stat, SCIP_Bool *valid)
SCIP_RETCODE	SCIPlpGetIterations (SCIP_LP *lp, int *iterations)
SCIP_RETCODE	SCIPlpUpdateAges (SCIP_LP *lp, SCIP_STAT *stat)
static SCIP_RETCODE	lpDelColset (SCIP_LP *lp, SCIP_SET *set, int *coldstat)
static SCIP_RETCODE	lpDelRowset (SCIP_LP *lp, BMS_BLKMEM *blkmem, SCIP_SET *set, SCIP_EVENTQUEUE *eventqueue, SCIP_EVENTFILTER *eventfilter, int *rowdstat)
static SCIP_RETCODE	lpRemoveObsoleteCols (SCIP_LP *lp, SCIP_SET *set, SCIP_STAT *stat, int firstcol)
static SCIP_RETCODE	lpRemoveObsoleteRows (SCIP_LP *lp, BMS_BLKMEM *blkmem, SCIP_SET *set, SCIP_STAT *stat, SCIP_EVENTQUEUE *eventqueue, SCIP_EVENTFILTER *eventfilter, int firstrow)
SCIP_RETCODE	SCIPlpRemoveNewObsoletes (SCIP_LP *lp, BMS_BLKMEM *blkmem, SCIP_SET *set, SCIP_STAT *stat, SCIP_EVENTQUEUE *eventqueue, SCIP_EVENTFILTER *eventfilter)
SCIP_RETCODE	SCIPlpRemoveAllObsoletes (SCIP_LP *lp, BMS_BLKMEM *blkmem, SCIP_SET *set, SCIP_STAT *stat, SCIP_EVENTQUEUE *eventqueue, SCIP_EVENTFILTER *eventfilter)
static SCIP_RETCODE	lpCleanupCols (SCIP_LP *lp, SCIP_SET *set, SCIP_STAT *stat, int firstcol)
static SCIP_RETCODE	lpCleanupRows (SCIP_LP *lp, BMS_BLKMEM *blkmem, SCIP_SET *set, SCIP_STAT *stat, SCIP_EVENTQUEUE *eventqueue, SCIP_EVENTFILTER *eventfilter, int firstrow)
SCIP_RETCODE	SCIPlpCleanupNew (SCIP_LP *lp, BMS_BLKMEM *blkmem, SCIP_SET *set, SCIP_STAT *stat, SCIP_EVENTQUEUE *eventqueue, SCIP_EVENTFILTER *eventfilter, SCIP_Bool root)
SCIP_RETCODE	SCIPlpCleanupAll (SCIP_LP *lp, BMS_BLKMEM *blkmem, SCIP_SET *set, SCIP_STAT *stat, SCIP_EVENTQUEUE *eventqueue, SCIP_EVENTFILTER *eventfilter, SCIP_Bool root)
SCIP_RETCODE	SCIPlpRemoveRedundantRows (SCIP_LP *lp, BMS_BLKMEM *blkmem, SCIP_SET *set, SCIP_STAT *stat, SCIP_EVENTQUEUE *eventqueue, SCIP_EVENTFILTER *eventfilter)
SCIP_RETCODE	SCIPlpStartDive (SCIP_LP *lp, BMS_BLKMEM *blkmem, SCIP_SET *set, SCIP_STAT *stat)
SCIP_RETCODE	SCIPlpEndDive (SCIP_LP *lp, BMS_BLKMEM *blkmem, SCIP_SET *set, SCIP_MESSAGEHDLR *messagehdlr, SCIP_STAT *stat, SCIP_EVENTQUEUE *eventqueue, SCIP_EVENTFILTER *eventfilter, SCIP_PROB *prob, SCIP_VAR **vars, int nvars)
SCIP_RETCODE	SCIPlpRecordOldRowSideDive (SCIP_LP *lp, SCIP_ROW *row, SCIP_SIDETYPE sidetype)
SCIP_RETCODE	SCIPlpStartProbing (SCIP_LP *lp)
SCIP_RETCODE	SCIPlpEndProbing (SCIP_LP *lp)
void	SCIPlpStartStrongbranchProbing (SCIP_LP *lp)
void	SCIPlpEndStrongbranchProbing (SCIP_LP *lp)
static SCIP_RETCODE	provedBound (SCIP_LP *lp, SCIP_SET *set, SCIP_Bool usefarkas, SCIP_Real *bound)
SCIP_RETCODE	SCIPlpGetProvedLowerbound (SCIP_LP *lp, SCIP_SET *set, SCIP_Real *bound)
SCIP_RETCODE	SCIPlpIsInfeasibilityProved (SCIP_LP *lp, SCIP_SET *set, SCIP_Bool *proved)
SCIP_RETCODE	SCIPlpWrite (SCIP_LP *lp, const char *fname)
SCIP_RETCODE	SCIPlpWriteMip (SCIP_LP *lp, SCIP_SET *set, SCIP_MESSAGEHDLR *messagehdlr, const char *fname, SCIP_Bool genericnames, SCIP_Bool origobj, SCIP_OBJSENSE objsense, SCIP_Real objscale, SCIP_Real objoffset, SCIP_Bool lazyconss)
SCIP_Real	SCIPcolGetObj (SCIP_COL *col)
SCIP_Real	SCIPcolGetLb (SCIP_COL *col)
SCIP_Real	SCIPcolGetUb (SCIP_COL *col)
SCIP_Real	SCIPcolGetBestBound (SCIP_COL *col)
SCIP_Real	SCIPcolGetPrimsol (SCIP_COL *col)
SCIP_Real	SCIPcolGetMinPrimsol (SCIP_COL *col)
SCIP_Real	SCIPcolGetMaxPrimsol (SCIP_COL *col)
SCIP_BASESTAT	SCIPcolGetBasisStatus (SCIP_COL *col)
SCIP_VAR *	SCIPcolGetVar (SCIP_COL *col)
int	SCIPcolGetIndex (SCIP_COL *col)
SCIP_Bool	SCIPcolIsIntegral (SCIP_COL *col)
SCIP_Bool	SCIPcolIsRemovable (SCIP_COL *col)
int	SCIPcolGetLPPos (SCIP_COL *col)
int	SCIPcolGetLPDepth (SCIP_COL *col)
SCIP_Bool	SCIPcolIsInLP (SCIP_COL *col)
int	SCIPcolGetNNonz (SCIP_COL *col)
int	SCIPcolGetNLPNonz (SCIP_COL *col)
SCIP_ROW **	SCIPcolGetRows (SCIP_COL *col)
SCIP_Real *	SCIPcolGetVals (SCIP_COL *col)
SCIP_Longint	SCIPcolGetStrongbranchNode (SCIP_COL *col)
int	SCIPcolGetNStrongbranchs (SCIP_COL *col)
int	SCIPcolGetAge (SCIP_COL *col)
SCIP_BOUNDTYPE	SCIPboundtypeOpposite (SCIP_BOUNDTYPE boundtype)
int	SCIProwGetNNonz (SCIP_ROW *row)
int	SCIProwGetNLPNonz (SCIP_ROW *row)
SCIP_COL **	SCIProwGetCols (SCIP_ROW *row)
SCIP_Real *	SCIProwGetVals (SCIP_ROW *row)
SCIP_Real	SCIProwGetConstant (SCIP_ROW *row)
SCIP_Real	SCIProwGetNorm (SCIP_ROW *row)
SCIP_Real	SCIProwGetSumNorm (SCIP_ROW *row)
SCIP_Real	SCIProwGetLhs (SCIP_ROW *row)
SCIP_Real	SCIProwGetRhs (SCIP_ROW *row)
SCIP_Real	SCIProwGetDualsol (SCIP_ROW *row)
SCIP_Real	SCIProwGetDualfarkas (SCIP_ROW *row)
SCIP_BASESTAT	SCIProwGetBasisStatus (SCIP_ROW *row)
const char *	SCIProwGetName (SCIP_ROW *row)
int	SCIProwGetIndex (SCIP_ROW *row)
int	SCIProwGetAge (SCIP_ROW *row)
int	SCIProwGetRank (SCIP_ROW *row)
SCIP_Bool	SCIProwIsIntegral (SCIP_ROW *row)
SCIP_Bool	SCIProwIsLocal (SCIP_ROW *row)
SCIP_Bool	SCIProwIsModifiable (SCIP_ROW *row)
SCIP_Bool	SCIProwIsRemovable (SCIP_ROW *row)
SCIP_ROWORIGINTYPE	SCIProwGetOrigintype (SCIP_ROW *row)
SCIP_CONS *	SCIProwGetOriginCons (SCIP_ROW *row)
SCIP_CONSHDLR *	SCIProwGetOriginConshdlr (SCIP_ROW *row)
SCIP_SEPA *	SCIProwGetOriginSepa (SCIP_ROW *row)
SCIP_Bool	SCIProwIsInGlobalCutpool (SCIP_ROW *row)
int	SCIProwGetLPPos (SCIP_ROW *row)
int	SCIProwGetLPDepth (SCIP_ROW *row)
SCIP_Bool	SCIProwIsInLP (SCIP_ROW *row)
void	SCIProwChgRank (SCIP_ROW *row, int rank)
SCIP_Longint	SCIProwGetActiveLPCount (SCIP_ROW *row)
SCIP_Longint	SCIProwGetNLPsAfterCreation (SCIP_ROW *row)
SCIP_COL **	SCIPlpGetCols (SCIP_LP *lp)
int	SCIPlpGetNCols (SCIP_LP *lp)
SCIP_ROW **	SCIPlpGetRows (SCIP_LP *lp)
int	SCIPlpGetNRows (SCIP_LP *lp)
SCIP_COL **	SCIPlpGetNewcols (SCIP_LP *lp)
int	SCIPlpGetNNewcols (SCIP_LP *lp)
SCIP_ROW **	SCIPlpGetNewrows (SCIP_LP *lp)
int	SCIPlpGetNNewrows (SCIP_LP *lp)
void	SCIPlpRecalculateObjSqrNorm (SCIP_SET *set, SCIP_LP *lp)
SCIP_Real	SCIPlpGetObjNorm (SCIP_LP *lp)
void	SCIPlpSetRootLPIsRelax (SCIP_LP *lp, SCIP_Bool isrelax)
SCIP_Bool	SCIPlpIsRootLPRelax (SCIP_LP *lp)
SCIP_Real	SCIPlpGetRootObjval (SCIP_LP *lp)
SCIP_Real	SCIPlpGetRootColumnObjval (SCIP_LP *lp)
SCIP_Real	SCIPlpGetRootLooseObjval (SCIP_LP *lp)
SCIP_LPI *	SCIPlpGetLPI (SCIP_LP *lp)
void	SCIPlpSetIsRelax (SCIP_LP *lp, SCIP_Bool relax)
SCIP_Bool	SCIPlpIsRelax (SCIP_LP *lp)
SCIP_Bool	SCIPlpIsSolved (SCIP_LP *lp)
SCIP_Bool	SCIPlpIsPrimalReliable (SCIP_LP *lp)
SCIP_Bool	SCIPlpIsDualReliable (SCIP_LP *lp)
SCIP_Bool	SCIPlpIsSolBasic (SCIP_LP *lp)
SCIP_Bool	SCIPlpDiving (SCIP_LP *lp)
SCIP_Bool	SCIPlpDivingObjChanged (SCIP_LP *lp)
void	SCIPlpMarkDivingObjChanged (SCIP_LP *lp)
void	SCIPlpUnmarkDivingObjChanged (SCIP_LP *lp)
SCIP_Bool	SCIPlpDivingRowsChanged (SCIP_LP *lp)
static SCIP_RETCODE	computeRelIntPoint (SCIP_LPI *lpi, SCIP_SET *set, SCIP_MESSAGEHDLR *messagehdlr, SCIP_LP *lp, SCIP_PROB *prob, SCIP_Bool relaxrows, SCIP_Bool inclobjcutoff, SCIP_Real timelimit, int iterlimit, SCIP_Real *point, SCIP_Bool *success)
SCIP_RETCODE	SCIPlpComputeRelIntPoint (SCIP_SET *set, SCIP_MESSAGEHDLR *messagehdlr, SCIP_LP *lp, SCIP_PROB *prob, SCIP_Bool relaxrows, SCIP_Bool inclobjcutoff, SCIP_Real timelimit, int iterlimit, SCIP_Real *point, SCIP_Bool *success)
SCIP_RETCODE	SCIPlpGetDegeneracy (SCIP_LP *lp, SCIP_SET *set, SCIP_STAT *stat, SCIP_Real *degeneracy, SCIP_Real *varconsratio)

Variables
static const SCIP_Real	scalars [] = {3.0, 5.0, 7.0, 9.0, 11.0, 13.0, 15.0, 17.0, 19.0}
static const int	nscalars = 9

Macro Definition Documentation

debugRowPrint

#define debugRowPrint	(		x,
			y
	)

Definition at line 112 of file lp.c.

Referenced by lpFlushAddRows(), and rowScale().

debugColPrint

#define debugColPrint	(		x,
			y
	)

Definition at line 145 of file lp.c.

Referenced by lpFlushAddCols().

checkRow

#define checkRow

(

row

)

Definition at line 681 of file lp.c.

Referenced by rowSortNonLP(), and SCIProwEnsureSize().

checkRowSqrnorm

#define checkRowSqrnorm

(

row

)

Definition at line 754 of file lp.c.

Referenced by SCIProwGetNorm(), and SCIProwGetObjParallelism().

checkRowSumnorm

#define checkRowSumnorm

(

row

)

Definition at line 755 of file lp.c.

Referenced by SCIProwGetSumNorm().

checkRowObjprod

#define checkRowObjprod

(

row

)

Definition at line 756 of file lp.c.

Referenced by SCIProwGetObjParallelism().

checkLinks

#define checkLinks

(

lp

)

Definition at line 1610 of file lp.c.

Referenced by colLink(), colUnlink(), lpDelColset(), lpDelRowset(), lpSolve(), rowEventSideChanged(), rowLink(), SCIPcolAddCoef(), SCIPcolChgCoef(), SCIPcolDelCoef(), SCIPcolIncCoef(), SCIPlpAddCol(), SCIPlpAddRow(), SCIPlpFlush(), SCIPlpMarkFlushed(), SCIPlpShrinkCols(), SCIPlpShrinkRows(), SCIProwAddCoef(), SCIProwChgCoef(), SCIProwDelCoef(), and SCIProwIncCoef().

lpCutoffDisabled

#define lpCutoffDisabled

(

set

)

(set->lp_disablecutoff == 1 || (set->nactivepricers > 0 && set->lp_disablecutoff == 2))

should the objective limit of the LP solver be disabled

Definition at line 2636 of file lp.c.

Referenced by lpSetObjlim(), lpSolve(), SCIPlpFlush(), SCIPlpSetCutoffbound(), and SCIPlpSolveAndEval().

DIVESTACKINITSIZE

#define DIVESTACKINITSIZE   100

Definition at line 9062 of file lp.c.

Referenced by SCIPlpCreate().

MAXNUMTROUBLELPMSGS

#define MAXNUMTROUBLELPMSGS   10

maximal number of verblevel-high messages about numerical trouble in LP that will be printed when this number is reached and display/verblevel is not full, then further messages are suppressed in this run

Definition at line 11457 of file lp.c.

Referenced by lpNumericalTroubleMessage().

FEASTOLTIGHTFAC

#define FEASTOLTIGHTFAC   0.001

Definition at line 11545 of file lp.c.

Referenced by lpSolveStable().

DIVESTACKGROWFACT

#define DIVESTACKGROWFACT   1.5

Definition at line 16158 of file lp.c.

Referenced by SCIPlpRecordOldRowSideDive().

Function Documentation

ensureChgcolsSize()

static SCIP_RETCODE ensureChgcolsSize ( SCIP_LP *  lp, SCIP_SET *  set, int  num  )

static

ensures, that chgcols array can store at least num entries

Parameters

lp	current LP data
set	global SCIP settings
num	minimum number of entries to store

Definition at line 154 of file lp.c.

References BMSreallocMemoryArray, SCIP_Lp::chgcols, SCIP_Lp::chgcolssize, SCIP_Lp::nchgcols, SCIP_ALLOC, SCIP_OKAY, and SCIPsetCalcMemGrowSize().

Referenced by insertColChgcols().

ensureChgrowsSize()

static SCIP_RETCODE ensureChgrowsSize ( SCIP_LP *  lp, SCIP_SET *  set, int  num  )

static

ensures, that chgrows array can store at least num entries

Parameters

lp	current LP data
set	global SCIP settings
num	minimum number of entries to store

Definition at line 177 of file lp.c.

References BMSreallocMemoryArray, SCIP_Lp::chgrows, SCIP_Lp::chgrowssize, SCIP_Lp::nchgrows, SCIP_ALLOC, SCIP_OKAY, and SCIPsetCalcMemGrowSize().

Referenced by rowSideChanged().

ensureLpicolsSize()

static SCIP_RETCODE ensureLpicolsSize ( SCIP_LP *  lp, SCIP_SET *  set, int  num  )

static

ensures, that lpicols array can store at least num entries

Parameters

lp	current LP data
set	global SCIP settings
num	minimum number of entries to store

Definition at line 200 of file lp.c.

References BMSreallocMemoryArray, SCIP_Lp::lpicols, SCIP_Lp::lpicolssize, SCIP_Lp::nlpicols, SCIP_ALLOC, SCIP_OKAY, and SCIPsetCalcMemGrowSize().

Referenced by lpFlushAddCols().

ensureLpirowsSize()

static SCIP_RETCODE ensureLpirowsSize ( SCIP_LP *  lp, SCIP_SET *  set, int  num  )

static

ensures, that lpirows array can store at least num entries

Parameters

lp	current LP data
set	global SCIP settings
num	minimum number of entries to store

Definition at line 223 of file lp.c.

References BMSreallocMemoryArray, SCIP_Lp::lpirows, SCIP_Lp::lpirowssize, SCIP_Lp::nlpirows, SCIP_ALLOC, SCIP_OKAY, and SCIPsetCalcMemGrowSize().

Referenced by lpFlushAddRows().

ensureColsSize()

static SCIP_RETCODE ensureColsSize ( SCIP_LP *  lp, SCIP_SET *  set, int  num  )

static

ensures, that cols array can store at least num entries

Parameters

lp	current LP data
set	global SCIP settings
num	minimum number of entries to store

Definition at line 246 of file lp.c.

References BMSreallocMemoryArray, SCIP_Lp::cols, SCIP_Lp::colssize, SCIP_Lp::ncols, SCIP_ALLOC, SCIP_OKAY, and SCIPsetCalcMemGrowSize().

Referenced by SCIPlpAddCol().

ensureSoldirectionSize()

static SCIP_RETCODE ensureSoldirectionSize ( SCIP_LP *  lp, int  num  )

static

ensures, that soldirection array can store at least num entries

Parameters

lp	current LP data
num	minimum number of entries to store

Definition at line 269 of file lp.c.

References BMSallocMemoryArray, BMSfreeMemoryArrayNull, SCIP_ALLOC, SCIP_OKAY, SCIP_Lp::soldirection, and SCIP_Lp::soldirectionsize.

Referenced by SCIProwGetLPSolCutoffDistance().

ensureLazycolsSize()

static SCIP_RETCODE ensureLazycolsSize ( SCIP_LP *  lp, SCIP_SET *  set, int  num  )

static

ensures, that lazy cols array can store at least num entries

Parameters

lp	current LP data
set	global SCIP settings
num	minimum number of entries to store

Definition at line 289 of file lp.c.

References BMSreallocMemoryArray, SCIP_Lp::lazycols, SCIP_Lp::lazycolssize, SCIP_Lp::nlazycols, SCIP_ALLOC, SCIP_OKAY, and SCIPsetCalcMemGrowSize().

Referenced by SCIPlpAddCol().

ensureRowsSize()

static SCIP_RETCODE ensureRowsSize ( SCIP_LP *  lp, SCIP_SET *  set, int  num  )

static

ensures, that rows array can store at least num entries

Parameters

lp	current LP data
set	global SCIP settings
num	minimum number of entries to store

Definition at line 312 of file lp.c.

References BMSreallocMemoryArray, SCIP_Lp::nrows, SCIP_Lp::rows, SCIP_Lp::rowssize, SCIP_ALLOC, SCIP_OKAY, and SCIPsetCalcMemGrowSize().

Referenced by SCIPlpAddRow().

colEnsureSize()

static SCIP_RETCODE colEnsureSize ( SCIP_COL *  col, BMS_BLKMEM *  blkmem, SCIP_SET *  set, int  num  )

static

ensures, that row array of column can store at least num entries

Parameters

col	LP column
blkmem	block memory
set	global SCIP settings
num	minimum number of entries to store

Definition at line 335 of file lp.c.

References BMSreallocBlockMemoryArray, SCIP_Col::len, SCIP_Col::linkpos, NULL, SCIP_Col::rows, SCIP_ALLOC, SCIP_OKAY, SCIPsetCalcMemGrowSize(), SCIP_Col::size, and SCIP_Col::vals.

Referenced by colAddCoef().

lpStoreSolVals()

static SCIP_RETCODE lpStoreSolVals ( SCIP_LP *  lp, SCIP_STAT *  stat, BMS_BLKMEM *  blkmem  )

static

save current LP values dependent on the solution

Parameters

lp	LP data
stat	problem statistics
blkmem	block memory

Definition at line 362 of file lp.c.

References BMSallocMemory, SCIP_LpSolVals::dualchecked, SCIP_Lp::dualchecked, SCIP_LpSolVals::dualfeasible, SCIP_Lp::dualfeasible, SCIP_LpSolVals::lpissolved, SCIP_LpSolVals::lpobjval, SCIP_Lp::lpobjval, SCIP_LpSolVals::lpsolstat, SCIP_Lp::lpsolstat, NULL, SCIP_LpSolVals::primalchecked, SCIP_Lp::primalchecked, SCIP_LpSolVals::primalfeasible, SCIP_Lp::primalfeasible, SCIP_ALLOC, SCIP_OKAY, SCIP_LpSolVals::solisbasic, SCIP_Lp::solisbasic, SCIP_Lp::solved, and SCIP_Lp::storedsolvals.

Referenced by SCIPlpStartDive().

lpRestoreSolVals()

static SCIP_RETCODE lpRestoreSolVals ( SCIP_LP *  lp, BMS_BLKMEM *  blkmem, SCIP_Longint  validlp  )

static

restore LP solution values in column

Parameters

lp	LP data
blkmem	block memory
validlp	number of lp for which restored values are valid

Definition at line 396 of file lp.c.

References SCIP_LpSolVals::dualchecked, SCIP_Lp::dualchecked, SCIP_LpSolVals::dualfeasible, SCIP_Lp::dualfeasible, FALSE, SCIP_LpSolVals::lpissolved, SCIP_LpSolVals::lpobjval, SCIP_Lp::lpobjval, SCIP_LpSolVals::lpsolstat, SCIP_Lp::lpsolstat, NULL, SCIP_LpSolVals::primalchecked, SCIP_Lp::primalchecked, SCIP_LpSolVals::primalfeasible, SCIP_Lp::primalfeasible, SCIP_INVALID, SCIP_LPSOLSTAT_INFEASIBLE, SCIP_LPSOLSTAT_ITERLIMIT, SCIP_LPSOLSTAT_NOTSOLVED, SCIP_LPSOLSTAT_OBJLIMIT, SCIP_LPSOLSTAT_OPTIMAL, SCIP_LPSOLSTAT_TIMELIMIT, SCIP_LPSOLSTAT_UNBOUNDEDRAY, SCIP_OKAY, SCIP_LpSolVals::solisbasic, SCIP_Lp::solisbasic, SCIP_Lp::solved, SCIP_Lp::storedsolvals, SCIP_Lp::validdegeneracylp, SCIP_Lp::validfarkaslp, and SCIP_Lp::validsollp.

Referenced by SCIPlpEndDive().

colStoreSolVals()

static SCIP_RETCODE colStoreSolVals ( SCIP_COL *  col, BMS_BLKMEM *  blkmem  )

static

save current LP solution values stored in each column

Parameters

col	LP column
blkmem	block memory

Definition at line 456 of file lp.c.

References SCIP_ColSolVals::basisstatus, SCIP_Col::basisstatus, BMSallocBlockMemory, NULL, SCIP_ColSolVals::primsol, SCIP_Col::primsol, SCIP_ColSolVals::redcost, SCIP_Col::redcost, SCIP_ALLOC, SCIP_OKAY, and SCIP_Col::storedsolvals.

Referenced by SCIPlpStartDive().

colRestoreSolVals()

static SCIP_RETCODE colRestoreSolVals ( SCIP_COL *  col, BMS_BLKMEM *  blkmem, SCIP_Longint  validlp, SCIP_Bool  freebuffer  )

static

restore LP solution values in column

Parameters

col	LP column
blkmem	block memory
validlp	number of lp for which restored values are valid
freebuffer	should buffer for LP solution values be freed?

Definition at line 483 of file lp.c.

References SCIP_ColSolVals::basisstatus, SCIP_Col::basisstatus, BMSfreeBlockMemoryNull, NULL, SCIP_ColSolVals::primsol, SCIP_Col::primsol, SCIP_ColSolVals::redcost, SCIP_Col::redcost, SCIP_BASESTAT_ZERO, SCIP_OKAY, SCIP_Col::storedsolvals, SCIP_Col::validfarkaslp, and SCIP_Col::validredcostlp.

Referenced by SCIPlpEndDive().

rowStoreSolVals()

static SCIP_RETCODE rowStoreSolVals ( SCIP_ROW *  row, BMS_BLKMEM *  blkmem, SCIP_Bool  infeasible  )

static

save current LP solution values stored in each column

Parameters

row	LP row
blkmem	block memory
infeasible	is the solution infeasible?

Definition at line 530 of file lp.c.

References SCIP_RowSolVals::activity, SCIP_Row::activity, SCIP_RowSolVals::basisstatus, SCIP_Row::basisstatus, BMSallocBlockMemory, SCIP_Row::dualfarkas, SCIP_RowSolVals::dualsol, SCIP_Row::dualsol, NULL, SCIP_ALLOC, SCIP_BASESTAT_BASIC, SCIP_INVALID, SCIP_OKAY, and SCIP_Row::storedsolvals.

Referenced by SCIPlpStartDive().

rowRestoreSolVals()

static SCIP_RETCODE rowRestoreSolVals ( SCIP_ROW *  row, BMS_BLKMEM *  blkmem, SCIP_Longint  validlp, SCIP_Bool  freebuffer, SCIP_Bool  infeasible  )

static

restore LP solution values in row

Parameters

row	LP column
blkmem	block memory
validlp	number of lp for which restored values are valid
freebuffer	should buffer for LP solution values be freed?
infeasible	is the solution infeasible?

Definition at line 567 of file lp.c.

References SCIP_RowSolVals::activity, SCIP_Row::activity, SCIP_RowSolVals::basisstatus, SCIP_Row::basisstatus, BMSfreeBlockMemoryNull, SCIP_Row::dualfarkas, SCIP_RowSolVals::dualsol, SCIP_Row::dualsol, NULL, SCIP_BASESTAT_BASIC, SCIP_INVALID, SCIP_OKAY, SCIP_Row::storedsolvals, and SCIP_Row::validactivitylp.

Referenced by SCIPlpEndDive().

SCIProwEnsureSize()

SCIP_RETCODE SCIProwEnsureSize	(	SCIP_ROW *	row,
		BMS_BLKMEM *	blkmem,
		SCIP_SET *	set,
		int	num
	)

ensures, that column array of row can store at least num entries

Parameters

row	LP row
blkmem	block memory
set	global SCIP settings
num	minimum number of entries to store

Definition at line 615 of file lp.c.

References BMSreallocBlockMemoryArray, checkRow, SCIP_Row::cols, SCIP_Row::cols_index, FALSE, SCIP_Col::index, SCIP_Row::len, SCIP_Row::linkpos, SCIP_Row::lpcolssorted, SCIP_Row::nlpcols, SCIP_Row::nonlpcolssorted, NULL, SCIP_ALLOC, SCIP_Bool, SCIP_OKAY, SCIPsetCalcMemGrowSize(), SCIP_Row::size, TRUE, and SCIP_Row::vals.

Referenced by rowAddCoef(), SCIPaddVarsToRow(), and SCIPaddVarsToRowSameCoef().

recomputeLooseObjectiveValue()

static void recomputeLooseObjectiveValue ( SCIP_LP *  lp, SCIP_SET *  set, SCIP_PROB *  prob  )

static

Parameters

lp	current LP data
set	global SCIP settings
prob	problem data

Definition at line 765 of file lp.c.

References SCIP_Lp::looseobjval, SCIP_Lp::looseobjvalid, NULL, SCIP_Prob::nvars, SCIP_Lp::rellooseobjval, SCIP_Real, SCIP_VARSTATUS_LOOSE, SCIPsetIsInfinity(), SCIPsetIsNegative(), SCIPsetIsPositive(), SCIPvarGetLbLocal(), SCIPvarGetObj(), SCIPvarGetStatus(), SCIPvarGetUbLocal(), TRUE, and SCIP_Prob::vars.

Referenced by getFiniteLooseObjval(), and SCIPlpGetObjval().

recomputePseudoObjectiveValue()

static void recomputePseudoObjectiveValue ( SCIP_LP *  lp, SCIP_SET *  set, SCIP_PROB *  prob  )

static

Parameters

lp	current LP data
set	global SCIP settings
prob	problem data

Definition at line 807 of file lp.c.

References NULL, SCIP_Prob::nvars, SCIP_Lp::pseudoobjval, SCIP_Lp::pseudoobjvalid, SCIP_Lp::relpseudoobjval, SCIPsetIsInfinity(), SCIPsetIsNegative(), SCIPsetIsPositive(), SCIPvarGetLbLocal(), SCIPvarGetObj(), SCIPvarGetUbLocal(), TRUE, and SCIP_Prob::vars.

Referenced by getFinitePseudoObjval(), and SCIPlpGetPseudoObjval().

recomputeGlbPseudoObjectiveValue()

static void recomputeGlbPseudoObjectiveValue ( SCIP_LP *  lp, SCIP_SET *  set, SCIP_PROB *  prob  )

static

Parameters

lp	current LP data
set	global SCIP settings
prob	problem data

Definition at line 849 of file lp.c.

References SCIP_Lp::glbpseudoobjval, SCIP_Lp::glbpseudoobjvalid, NULL, SCIP_Prob::nvars, SCIP_Lp::relglbpseudoobjval, SCIPsetIsInfinity(), SCIPsetIsNegative(), SCIPsetIsPositive(), SCIPvarGetLbGlobal(), SCIPvarGetObj(), SCIPvarGetUbGlobal(), TRUE, and SCIP_Prob::vars.

Referenced by SCIPlpGetGlobalPseudoObjval().

getFiniteLooseObjval()

static SCIP_Real getFiniteLooseObjval ( SCIP_LP *  lp, SCIP_SET *  set, SCIP_PROB *  prob  )

static

gets finite part of objective value of current LP that results from LOOSE variables only

Parameters

lp	current LP data
set	global SCIP settings
prob	problem data

Definition at line 891 of file lp.c.

References SCIP_Lp::flushed, SCIP_Lp::looseobjval, SCIP_Lp::looseobjvalid, SCIP_Lp::looseobjvalinf, SCIP_Lp::nloosevars, NULL, and recomputeLooseObjectiveValue().

Referenced by computeRelIntPoint(), lpSolve(), lpSolveStable(), SCIPcolGetStrongbranch(), SCIPcolGetStrongbranches(), SCIPlpGetLooseObjval(), and SCIPlpSolveAndEval().

getFinitePseudoObjval()

static SCIP_Real getFinitePseudoObjval ( SCIP_LP *  lp, SCIP_SET *  set, SCIP_PROB *  prob  )

static

gets finite part of pseudo objective value of current LP

Parameters

lp	current LP data
set	global SCIP settings
prob	problem data

Definition at line 913 of file lp.c.

References NULL, SCIP_Lp::pseudoobjval, SCIP_Lp::pseudoobjvalid, and recomputePseudoObjectiveValue().

Referenced by SCIPlpGetModifiedPseudoObjval().

colSortLP()

static void colSortLP ( SCIP_COL *  col )

static

sorts column entries of linked rows currently in the LP such that lower row indices precede higher ones

Parameters

col	column to be sorted

Definition at line 955 of file lp.c.

References SCIP_Row::cols, SCIP_Col::linkpos, SCIP_Row::linkpos, SCIP_Col::lprowssorted, SCIP_Col::nlprows, NULL, SCIP_Col::rows, SCIPsortPtrRealInt(), TRUE, and SCIP_Col::vals.

Referenced by colSearchCoef(), and SCIPcolSort().

colSortNonLP()

static void colSortNonLP ( SCIP_COL *  col )

static

sorts column entries of unlinked rows or rows currently not in the LP such that lower row indices precede higher ones

Parameters

col	column to be sorted

Definition at line 988 of file lp.c.

References SCIP_Row::cols, SCIP_Col::len, SCIP_Col::linkpos, SCIP_Row::linkpos, SCIP_Col::nlprows, SCIP_Col::nonlprowssorted, NULL, SCIP_Col::rows, SCIPsortPtrRealInt(), TRUE, and SCIP_Col::vals.

Referenced by colSearchCoef(), and SCIPcolSort().

rowSortLP()

static void rowSortLP ( SCIP_ROW *  row )

static

sorts row entries of linked columns currently in the LP such that lower column indices precede higher ones

Parameters

row	row to be sorted

Definition at line 1019 of file lp.c.

References SCIP_Row::cols, SCIP_Row::cols_index, SCIP_Row::delaysort, SCIP_Col::linkpos, SCIP_Row::linkpos, SCIP_Row::lpcolssorted, SCIP_Row::nlpcols, NULL, SCIP_Col::rows, SCIPsortIntPtrIntReal(), TRUE, and SCIP_Row::vals.

Referenced by computeRelIntPoint(), rowSearchCoef(), and SCIProwSort().

rowSortNonLP()

static void rowSortNonLP ( SCIP_ROW *  row )

static

sorts row entries of unlinked columns or columns currently not in the LP such that lower column indices precede higher ones

Parameters

row	row to be sorted

Definition at line 1052 of file lp.c.

References checkRow, SCIP_Row::cols, SCIP_Row::cols_index, SCIP_Row::delaysort, SCIP_Row::len, SCIP_Col::linkpos, SCIP_Row::linkpos, SCIP_Row::nlpcols, SCIP_Row::nonlpcolssorted, NULL, SCIP_Col::rows, SCIPsortIntPtrIntReal(), TRUE, and SCIP_Row::vals.

Referenced by rowSearchCoef(), and SCIProwSort().

colSearchCoefPart()

static int colSearchCoefPart ( SCIP_COL *  col, const SCIP_ROW *  row, int  minpos, int  maxpos  )

static

searches coefficient in part of the column, returns position in col vector or -1 if not found

Parameters

col	column to be searched in
row	coefficient to be searched for
minpos	first position of search range
maxpos	last position of search range

Definition at line 1087 of file lp.c.

References SCIP_Row::index, SCIP_Col::linkpos, SCIP_Row::lppos, NULL, and SCIP_Col::rows.

Referenced by colSearchCoef().

colSearchCoef()

static int colSearchCoef ( SCIP_COL *  col, const SCIP_ROW *  row  )

static

searches coefficient in column, returns position in col vector or -1 if not found

Parameters

col	column to be searched in
row	coefficient to be searched for

Definition at line 1123 of file lp.c.

References colSearchCoefPart(), colSortLP(), colSortNonLP(), SCIP_Col::len, SCIP_Row::lppos, SCIP_Col::lprowssorted, SCIP_Col::nlprows, SCIP_Col::nonlprowssorted, NULL, and SCIP_Col::nunlinked.

Referenced by SCIPcolChgCoef(), SCIPcolDelCoef(), and SCIPcolIncCoef().

rowSearchCoefPart()

static int rowSearchCoefPart ( SCIP_ROW *  row, const SCIP_COL *  col, int  minpos, int  maxpos  )

static

searches coefficient in part of the row, returns position in col vector or -1 if not found

Parameters

row	row to be searched in
col	coefficient to be searched for
minpos	first position of search range
maxpos	last position of search range

Definition at line 1162 of file lp.c.

References SCIP_Row::cols, SCIP_Row::cols_index, SCIP_Col::index, SCIP_Row::linkpos, SCIP_Col::lppos, and NULL.

Referenced by rowSearchCoef().

rowSearchCoef()

static int rowSearchCoef ( SCIP_ROW *  row, const SCIP_COL *  col  )

static

searches coefficient in row, returns position in row vector or -1 if not found; if the sorting of the row is delayed, returns -1

Parameters

row	row to be searched in
col	coefficient to be searched for

Definition at line 1201 of file lp.c.

References SCIP_Row::cols, SCIP_Row::delaysort, SCIP_Row::len, SCIP_Row::lpcolssorted, SCIP_Col::lppos, SCIP_Row::nlpcols, SCIP_Row::nonlpcolssorted, NULL, SCIP_Row::nunlinked, rowSearchCoefPart(), rowSortLP(), and rowSortNonLP().

Referenced by SCIProwChgCoef(), SCIProwDelCoef(), and SCIProwIncCoef().

colMoveCoef()

static void colMoveCoef ( SCIP_COL *  col, int  oldpos, int  newpos  )

static

moves a coefficient in a column to a different place, and updates all corresponding data structures

Parameters

col	LP column
oldpos	old position of coefficient
newpos	new position of coefficient

Definition at line 1254 of file lp.c.

References SCIP_Row::cols, FALSE, SCIP_Col::linkpos, SCIP_Row::linkpos, SCIP_Row::lppos, SCIP_Col::lprowssorted, SCIP_Col::nonlprowssorted, NULL, SCIP_Col::rows, and SCIP_Col::vals.

Referenced by colAddCoef(), and colDelCoefPos().

colSwapCoefs()

static void colSwapCoefs ( SCIP_COL *  col, int  pos1, int  pos2  )

static

swaps two coefficients in a column, and updates all corresponding data structures

Parameters

col	LP column
pos1	position of first coefficient
pos2	position of second coefficient

Definition at line 1290 of file lp.c.

References SCIP_Row::cols, FALSE, SCIP_Col::linkpos, SCIP_Row::linkpos, SCIP_Row::lppos, SCIP_Col::lprowssorted, SCIP_Col::nonlprowssorted, NULL, SCIP_Col::rows, SCIP_Real, and SCIP_Col::vals.

Referenced by rowAddCoef(), rowUpdateAddLP(), and rowUpdateDelLP().

rowMoveCoef()

static void rowMoveCoef ( SCIP_ROW *  row, int  oldpos, int  newpos  )

static

moves a coefficient in a row to a different place, and updates all corresponding data structures

Parameters

row	LP row
oldpos	old position of coefficient
newpos	new position of coefficient

Definition at line 1350 of file lp.c.

References SCIP_Row::cols, SCIP_Row::cols_index, FALSE, SCIP_Col::linkpos, SCIP_Row::linkpos, SCIP_Row::lpcolssorted, SCIP_Col::lppos, SCIP_Row::nonlpcolssorted, NULL, SCIP_Col::rows, and SCIP_Row::vals.

Referenced by rowAddCoef(), and rowDelCoefPos().

rowSwapCoefs()

static void rowSwapCoefs ( SCIP_ROW *  row, int  pos1, int  pos2  )

static

swaps two coefficients in a row, and updates all corresponding data structures

Parameters

row	LP row
pos1	position of first coefficient
pos2	position of second coefficient

Definition at line 1387 of file lp.c.

References SCIP_Row::cols, SCIP_Row::cols_index, FALSE, SCIP_Col::index, SCIP_Col::linkpos, SCIP_Row::linkpos, SCIP_Row::lpcolssorted, SCIP_Col::lppos, SCIP_Row::nonlpcolssorted, NULL, SCIP_Col::rows, SCIP_Real, and SCIP_Row::vals.

Referenced by colAddCoef(), colUpdateAddLP(), and colUpdateDelLP().

rowEventCoefChanged()

static SCIP_RETCODE rowEventCoefChanged ( SCIP_ROW *  row, BMS_BLKMEM *  blkmem, SCIP_SET *  set, SCIP_EVENTQUEUE *  eventqueue, SCIP_COL *  col, SCIP_Real  oldval, SCIP_Real  newval  )

static

issues a ROWCOEFCHANGED event on the given row

Parameters

row	row which coefficient has changed
blkmem	block memory
set	global SCIP settings
eventqueue	event queue
col	the column which coefficient has changed
oldval	old value of the coefficient
newval	new value of the coefficient

Definition at line 1452 of file lp.c.

References SCIP_Row::eventfilter, SCIP_EventFilter::eventmask, SCIP_EventFilter::len, NULL, SCIP_CALL, SCIP_EVENTTYPE_ROWCOEFCHANGED, SCIP_OKAY, SCIPeventCreateRowCoefChanged(), and SCIPeventqueueAdd().

Referenced by rowAddCoef(), rowChgCoefPos(), and rowDelCoefPos().

rowEventConstantChanged()

static SCIP_RETCODE rowEventConstantChanged ( SCIP_ROW *  row, BMS_BLKMEM *  blkmem, SCIP_SET *  set, SCIP_EVENTQUEUE *  eventqueue, SCIP_Real  oldval, SCIP_Real  newval  )

static

issues a ROWCONSTCHANGED event on the given row

Parameters

row	row which coefficient has changed
blkmem	block memory
set	global SCIP settings
eventqueue	event queue
oldval	old value of the constant
newval	new value of the constant

Definition at line 1482 of file lp.c.

References SCIP_Row::eventfilter, SCIP_EventFilter::eventmask, SCIP_EventFilter::len, NULL, SCIP_CALL, SCIP_EVENTTYPE_ROWCONSTCHANGED, SCIP_OKAY, SCIPeventCreateRowConstChanged(), and SCIPeventqueueAdd().

Referenced by SCIProwChgConstant().

rowEventSideChanged()

static SCIP_RETCODE rowEventSideChanged ( SCIP_ROW *  row, BMS_BLKMEM *  blkmem, SCIP_SET *  set, SCIP_EVENTQUEUE *  eventqueue, SCIP_SIDETYPE  side, SCIP_Real  oldval, SCIP_Real  newval  )

static

issues a ROWSIDECHANGED event on the given row

Parameters

row	row which coefficient has changed
blkmem	block memory
set	global SCIP settings
eventqueue	event queue
side	the side that has changed
oldval	old value of side
newval	new value of side

Definition at line 1510 of file lp.c.

References checkLinks, SCIP_Row::cols, SCIP_Lp::cols, SCIP_Row::dualfarkas, SCIP_Row::dualsol, EPSEQ, SCIP_Row::eventfilter, SCIP_EventFilter::eventmask, FALSE, SCIP_Col::farkascoef, SCIP_Lp::flushed, SCIP_Col::len, SCIP_EventFilter::len, SCIP_Row::len, SCIP_Col::linkpos, SCIP_Row::linkpos, SCIP_Lp::lpifirstchgcol, SCIP_Lp::lpifirstchgrow, SCIP_Col::lppos, SCIP_Row::lppos, SCIP_Lp::ncols, SCIP_Row::nlpcols, SCIP_Col::nlprows, SCIP_Lp::nrows, NULL, SCIP_Col::nunlinked, SCIP_Row::nunlinked, SCIP_Col::primsol, SCIP_Col::rows, SCIP_Lp::rows, SCIP_Bool, SCIP_CALL, SCIP_EVENTTYPE_ROWSIDECHANGED, SCIP_OKAY, SCIPeventCreateRowSideChanged(), SCIPeventqueueAdd(), TRUE, SCIP_Col::vals, and SCIP_Row::vals.

Referenced by SCIProwChgLhs(), and SCIProwChgRhs().

coefChanged()

static void coefChanged ( SCIP_ROW *  row, SCIP_COL *  col, SCIP_LP *  lp  )

static

announces, that the given coefficient in the constraint matrix changed

Parameters

row	LP row
col	LP col
lp	current LP data

Definition at line 1619 of file lp.c.

References SCIP_Col::coefchanged, SCIP_Row::coefchanged, FALSE, SCIP_Lp::flushed, SCIP_Lp::lpifirstchgcol, SCIP_Lp::lpifirstchgrow, SCIP_Col::lpipos, SCIP_Row::lpipos, SCIP_Row::maxactivity, SCIP_Row::minactivity, SCIP_Lp::nlpicols, SCIP_Lp::nlpirows, NULL, SCIP_Row::pseudoactivity, rowAddCoef(), SCIP_INVALID, SCIP_Real, TRUE, SCIP_Row::validactivitybdsdomchg, and SCIP_Row::validpsactivitydomchg.

Referenced by colAddCoef(), colChgCoefPos(), colDelCoefPos(), rowAddCoef(), rowChgCoefPos(), and rowDelCoefPos().

rowAddCoef()

static SCIP_RETCODE rowAddCoef ( SCIP_ROW *  row, BMS_BLKMEM *  blkmem, SCIP_SET *  set, SCIP_EVENTQUEUE *  eventqueue, SCIP_LP *  lp, SCIP_COL *  col, SCIP_Real  val, int  linkpos  )

static

adds a previously non existing coefficient to an LP row

Parameters

row	LP row
blkmem	block memory
set	global SCIP settings
eventqueue	event queue
lp	current LP data
col	LP column
val	value of coefficient
linkpos	position of row in the column's row array, or -1

Definition at line 2029 of file lp.c.

References coefChanged(), colAddCoef(), SCIP_Row::cols, SCIP_Row::cols_index, colSwapCoefs(), FALSE, SCIP_Col::index, SCIP_Row::integral, SCIP_Row::len, SCIP_Col::linkpos, SCIP_Row::linkpos, SCIP_Row::lpcolssorted, SCIP_Col::lppos, SCIP_Row::lppos, SCIP_Col::lprowssorted, SCIP_Row::name, SCIP_Row::nlocks, SCIP_Row::nlpcols, SCIP_Col::nlprows, SCIP_Row::nonlpcolssorted, NULL, SCIP_Col::nunlinked, SCIP_Row::nunlinked, rowAddNorms(), rowEventCoefChanged(), rowMoveCoef(), SCIP_Col::rows, SCIP_CALL, SCIP_INVALIDDATA, SCIP_OKAY, SCIPcolIsIntegral(), SCIPerrorMessage, SCIProwEnsureSize(), SCIPsetDebugMsg, SCIPsetIsIntegral(), SCIPsetIsZero(), SCIPsetRound(), SCIPvarGetName(), SCIPvarGetProbindex(), TRUE, SCIP_Row::vals, SCIP_Col::var, and SCIP_Col::var_probindex.

Referenced by coefChanged(), colAddCoef(), colLink(), SCIProwAddCoef(), SCIProwChgCoef(), and SCIProwIncCoef().

colAddCoef()

static SCIP_RETCODE colAddCoef ( SCIP_COL *  col, BMS_BLKMEM *  blkmem, SCIP_SET *  set, SCIP_EVENTQUEUE *  eventqueue, SCIP_LP *  lp, SCIP_ROW *  row, SCIP_Real  val, int  linkpos  )

static

adds a previously non existing coefficient to an LP column

Parameters

col	LP column
blkmem	block memory
set	global SCIP settings
eventqueue	event queue
lp	current LP data
row	LP row
val	value of coefficient
linkpos	position of column in the row's col array, or -1

Definition at line 1684 of file lp.c.

References coefChanged(), colEnsureSize(), colMoveCoef(), SCIP_Row::cols, FALSE, SCIP_Row::index, SCIP_Col::len, SCIP_Col::linkpos, SCIP_Row::linkpos, SCIP_Row::lpcolssorted, SCIP_Col::lppos, SCIP_Row::lppos, SCIP_Col::lprowssorted, SCIP_Row::name, SCIP_Row::nlpcols, SCIP_Col::nlprows, SCIP_Col::nonlprowssorted, NULL, SCIP_Col::nunlinked, SCIP_Row::nunlinked, rowAddCoef(), SCIP_Col::rows, rowSwapCoefs(), SCIP_CALL, SCIP_OKAY, SCIPsetDebugMsg, SCIPsetIsIntegral(), SCIPsetIsZero(), SCIPsetRound(), SCIPvarGetName(), SCIP_Col::vals, and SCIP_Col::var.

Referenced by rowAddCoef(), rowLink(), SCIPcolAddCoef(), SCIPcolChgCoef(), and SCIPcolIncCoef().

colDelCoefPos()

static SCIP_RETCODE colDelCoefPos ( SCIP_COL *  col, SCIP_SET *  set, SCIP_LP *  lp, int  pos  )

static

deletes coefficient at given position from column

Parameters

col	column to be changed
set	global SCIP settings
lp	current LP data
pos	position in column vector to delete

Definition at line 1805 of file lp.c.

References coefChanged(), colMoveCoef(), SCIP_Row::cols, SCIP_Col::len, SCIP_Col::linkpos, SCIP_Row::lppos, SCIP_Col::nlprows, NULL, SCIP_Col::nunlinked, SCIP_Col::rows, SCIP_OKAY, and SCIP_Col::var.

Referenced by colChgCoefPos(), rowUnlink(), SCIPcolDelCoef(), and SCIProwDelCoef().

colChgCoefPos()

static SCIP_RETCODE colChgCoefPos ( SCIP_COL *  col, SCIP_SET *  set, SCIP_LP *  lp, int  pos, SCIP_Real  val  )

static

changes a coefficient at given position of an LP column

Parameters

col	LP column
set	global SCIP settings
lp	current LP data
pos	position in column vector to change
val	value of coefficient

Definition at line 1850 of file lp.c.

References coefChanged(), colDelCoefPos(), SCIP_Row::cols, SCIP_Col::linkpos, NULL, SCIP_Col::rows, SCIP_CALL, SCIP_OKAY, SCIPsetIsEQ(), SCIPsetIsIntegral(), SCIPsetIsZero(), SCIPsetRound(), SCIP_Col::vals, and SCIP_Col::var.

Referenced by rowScale(), SCIPcolChgCoef(), SCIPcolIncCoef(), SCIProwChgCoef(), and SCIProwIncCoef().

rowAddNorms()

static void rowAddNorms ( SCIP_ROW *  row, SCIP_SET *  set, SCIP_COL *  col, SCIP_Real  val, SCIP_Bool  updateidxvals  )

static

update row norms after addition of coefficient

Parameters

row	LP row
set	global SCIP settings
col	column of added coefficient
val	value of added coefficient
updateidxvals	update min/max idx and min/max val?

Definition at line 1894 of file lp.c.

References SCIP_Col::index, SCIP_Col::lppos, MAX, SCIP_Row::maxidx, SCIP_Row::maxval, SCIP_Row::minidx, SCIP_Row::minval, NULL, SCIP_Row::nummaxval, SCIP_Row::numminval, SCIP_Row::objprod, REALABS, SCIP_Real, SCIPsetIsGE(), SCIPsetIsGT(), SCIPsetIsLE(), SCIPsetIsLT(), SCIPsetIsZero(), SCIP_Row::sqrnorm, SCIP_Row::sumnorm, and SCIP_Col::unchangedobj.

Referenced by colUpdateAddLP(), rowAddCoef(), rowCalcNorms(), and rowChgCoefPos().

rowDelNorms()

static void rowDelNorms ( SCIP_ROW *  row, SCIP_SET *  set, SCIP_COL *  col, SCIP_Real  val, SCIP_Bool  forcenormupdate, SCIP_Bool  updateindex, SCIP_Bool  updateval  )

static

update row norms after deletion of coefficient

Parameters

row	LP row
set	global SCIP settings
col	column of deleted coefficient
val	value of deleted coefficient
forcenormupdate	should the norms be updated even if lppos of column is -1?
updateindex	should the minimal/maximal column index of row be updated?
updateval	should the minimal/maximal value of row be updated?

Definition at line 1971 of file lp.c.

References FALSE, SCIP_Col::index, SCIP_Col::lppos, MAX, SCIP_Row::maxidx, SCIP_Row::maxval, SCIP_Row::minidx, SCIP_Row::minval, NULL, SCIP_Row::nummaxval, SCIP_Row::numminval, SCIP_Row::objprod, REALABS, SCIP_Real, SCIPsetIsGE(), SCIPsetIsLE(), SCIPsetIsZero(), SCIP_Row::sqrnorm, SCIP_Row::sumnorm, SCIP_Col::unchangedobj, and SCIP_Row::validminmaxidx.

Referenced by colUpdateDelLP(), rowChgCoefPos(), and rowDelCoefPos().

rowDelCoefPos()

static SCIP_RETCODE rowDelCoefPos ( SCIP_ROW *  row, BMS_BLKMEM *  blkmem, SCIP_SET *  set, SCIP_EVENTQUEUE *  eventqueue, SCIP_LP *  lp, int  pos  )

static

deletes coefficient at given position from row

Parameters

row	row to be changed
blkmem	block memory
set	global SCIP settings
eventqueue	event queue
lp	current LP data
pos	position in row vector to delete

Definition at line 2170 of file lp.c.

References coefChanged(), SCIP_Row::cols, FALSE, SCIP_Row::len, SCIP_Row::linkpos, SCIP_Row::lpcolssorted, SCIP_Col::lppos, SCIP_Row::name, SCIP_Row::nlocks, SCIP_Row::nlpcols, NULL, SCIP_Row::nunlinked, rowDelNorms(), rowEventCoefChanged(), rowMoveCoef(), SCIP_CALL, SCIP_INVALIDDATA, SCIP_OKAY, SCIP_Real, SCIPerrorMessage, TRUE, and SCIP_Row::vals.

Referenced by colUnlink(), rowChgCoefPos(), SCIPcolDelCoef(), and SCIProwDelCoef().

rowChgCoefPos()

static SCIP_RETCODE rowChgCoefPos ( SCIP_ROW *  row, BMS_BLKMEM *  blkmem, SCIP_SET *  set, SCIP_EVENTQUEUE *  eventqueue, SCIP_LP *  lp, int  pos, SCIP_Real  val  )

static

changes a coefficient at given position of an LP row

Parameters

row	LP row
blkmem	block memory
set	global SCIP settings
eventqueue	event queue
lp	current LP data
pos	position in row vector to change
val	value of coefficient

Definition at line 2230 of file lp.c.

References coefChanged(), SCIP_Row::cols, FALSE, SCIP_Row::integral, SCIP_Row::name, SCIP_Row::nlocks, NULL, rowAddNorms(), rowDelCoefPos(), rowDelNorms(), rowEventCoefChanged(), SCIP_CALL, SCIP_INVALIDDATA, SCIP_OKAY, SCIP_Real, SCIPcolIsIntegral(), SCIPerrorMessage, SCIPsetIsEQ(), SCIPsetIsIntegral(), SCIPsetIsZero(), SCIPsetRound(), TRUE, and SCIP_Row::vals.

Referenced by rowScale(), SCIPcolChgCoef(), SCIPcolIncCoef(), SCIProwChgCoef(), and SCIProwIncCoef().

rowSideChanged()

static SCIP_RETCODE rowSideChanged ( SCIP_ROW *  row, SCIP_SET *  set, SCIP_LP *  lp, SCIP_SIDETYPE  sidetype  )

static

notifies LP row, that its sides were changed

Parameters

row	LP row
set	global SCIP settings
lp	current LP data
sidetype	type of side: left or right hand side

Definition at line 2286 of file lp.c.

References SCIP_Lp::chgrows, ensureChgrowsSize(), FALSE, SCIP_Lp::flushed, SCIP_Row::lhschanged, SCIP_Row::lpipos, SCIP_Lp::nchgrows, NULL, SCIP_Row::rhschanged, SCIP_CALL, SCIP_INVALIDDATA, SCIP_OKAY, SCIP_SIDETYPE_LEFT, SCIP_SIDETYPE_RIGHT, SCIPABORT, SCIPerrorMessage, and TRUE.

Referenced by SCIProwChgConstant(), SCIProwChgLhs(), and SCIProwChgRhs().

colLink()

static SCIP_RETCODE colLink ( SCIP_COL *  col, BMS_BLKMEM *  blkmem, SCIP_SET *  set, SCIP_EVENTQUEUE *  eventqueue, SCIP_LP *  lp  )

static

insert column coefficients in corresponding rows

Parameters

col	column data
blkmem	block memory
set	global SCIP settings
eventqueue	event queue
lp	current LP data

Definition at line 2339 of file lp.c.

References checkLinks, SCIP_Row::cols, SCIP_Col::linkpos, SCIP_Row::linkpos, SCIP_Col::nlprows, NULL, SCIP_Col::nunlinked, rowAddCoef(), SCIP_Col::rows, SCIP_CALL, SCIP_OKAY, SCIPsetDebugMsg, SCIPsetIsZero(), SCIPvarGetName(), SCIP_Col::vals, and SCIP_Col::var.

Referenced by lpFlushAddCols().

colUnlink()

static SCIP_RETCODE colUnlink ( SCIP_COL *  col, BMS_BLKMEM *  blkmem, SCIP_SET *  set, SCIP_EVENTQUEUE *  eventqueue, SCIP_LP *  lp  )

static

removes column coefficients from corresponding rows

Parameters

col	column data
blkmem	block memory
set	global SCIP settings
eventqueue	event queue
lp	current LP data

Definition at line 2383 of file lp.c.

References checkLinks, SCIP_Row::cols, SCIP_Col::len, SCIP_Col::linkpos, NULL, SCIP_Col::nunlinked, rowDelCoefPos(), SCIP_Col::rows, SCIP_CALL, SCIP_OKAY, SCIPsetDebugMsg, SCIPvarGetName(), and SCIP_Col::var.

Referenced by SCIPcolFree().

rowLink()

static SCIP_RETCODE rowLink ( SCIP_ROW *  row, BMS_BLKMEM *  blkmem, SCIP_SET *  set, SCIP_EVENTQUEUE *  eventqueue, SCIP_LP *  lp  )

static

insert row coefficients in corresponding columns

Parameters

row	row data
blkmem	block memory
set	global SCIP settings
eventqueue	event queue
lp	current LP data

Definition at line 2422 of file lp.c.

References checkLinks, colAddCoef(), SCIP_Row::cols, SCIP_Col::linkpos, SCIP_Row::linkpos, SCIP_Row::name, SCIP_Row::nlpcols, NULL, SCIP_Row::nunlinked, SCIP_Col::rows, SCIP_CALL, SCIP_OKAY, SCIPsetDebugMsg, SCIPsetIsZero(), and SCIP_Row::vals.

Referenced by lpFlushAddRows().

rowUnlink()

static SCIP_RETCODE rowUnlink ( SCIP_ROW *  row, SCIP_SET *  set, SCIP_LP *  lp  )

static

removes row coefficients from corresponding columns

Parameters

row	row data
set	global SCIP settings
lp	current LP data

Definition at line 2465 of file lp.c.

References colDelCoefPos(), SCIP_Row::cols, SCIP_Row::len, SCIP_Row::linkpos, SCIP_Row::name, NULL, SCIP_Row::nunlinked, SCIP_Col::rows, SCIP_CALL, SCIP_OKAY, and SCIPsetDebugMsg.

Referenced by SCIProwFree().

lpSetIntpar()

static SCIP_RETCODE lpSetIntpar ( SCIP_LP *  lp, SCIP_LPPARAM  lpparam, int  value, SCIP_Bool *  success  )

static

sets parameter of type int in LP solver, ignoring unknown parameters

Parameters

lp	current LP data
lpparam	LP parameter
value	value to set parameter to
success	pointer to store whether the parameter was successfully changed

Definition at line 2504 of file lp.c.

References FALSE, SCIP_Lp::lpi, NULL, SCIP_OKAY, SCIP_PARAMETERUNKNOWN, SCIPlpiSetIntpar(), and TRUE.

Referenced by lpSetBoolpar(), lpSetFastmip(), lpSetIterationLimit(), lpSetPricing(), lpSetRandomseed(), lpSetRefactorInterval(), lpSetScaling(), lpSetSolutionPolishing(), lpSetThreads(), lpSetTiming(), and SCIPlpCreate().

lpSetBoolpar()

static SCIP_RETCODE lpSetBoolpar ( SCIP_LP *  lp, SCIP_LPPARAM  lpparam, SCIP_Bool  value, SCIP_Bool *  success  )

static

sets parameter of type SCIP_Bool in LP solver, ignoring unknown parameters

Parameters

lp	current LP data
lpparam	LP parameter
value	value to set parameter to
success	pointer to store whether the parameter was successfully changed

Definition at line 2531 of file lp.c.

References lpSetIntpar().

Referenced by lpSetFromscratch(), lpSetLPInfo(), lpSetPresolving(), and SCIPlpCreate().

lpSetRealpar()

static SCIP_RETCODE lpSetRealpar ( SCIP_LP *  lp, SCIP_LPPARAM  lpparam, SCIP_Real  value, SCIP_Bool *  success  )

static

sets parameter of type SCIP_Real in LP solver, ignoring unknown parameters

Parameters

lp	current LP data
lpparam	LP parameter
value	value to set parameter to
success	pointer to store whether the parameter was successfully changed

Definition at line 2543 of file lp.c.

References FALSE, SCIP_Lp::lpi, NULL, SCIP_OKAY, SCIP_PARAMETERUNKNOWN, SCIPlpiSetRealpar(), and TRUE.

Referenced by lpAlgorithm(), lpSetBarrierconvtol(), lpSetConditionLimit(), lpSetDualfeastol(), lpSetFeastol(), lpSetMarkowitz(), lpSetObjlim(), lpSetRowrepswitch(), and SCIPlpCreate().

lpCheckIntpar()

static SCIP_RETCODE lpCheckIntpar ( SCIP_LP *  lp, SCIP_LPPARAM  lpparam, int  value  )

static

checks, that parameter of type int in LP solver has the given value, ignoring unknown parameters

Parameters

lp	current LP data
lpparam	LP parameter
value	value parameter should have

Definition at line 2571 of file lp.c.

References SCIP_Lp::lpi, NULL, SCIP_OKAY, SCIP_PARAMETERUNKNOWN, and SCIPlpiGetIntpar().

Referenced by lpCheckBoolpar(), lpSetFastmip(), lpSetIterationLimit(), lpSetPricing(), lpSetScaling(), lpSetThreads(), and lpSetTiming().

lpCheckBoolpar()

static SCIP_RETCODE lpCheckBoolpar ( SCIP_LP *  lp, SCIP_LPPARAM  lpparam, SCIP_Bool  value  )

static

checks, that parameter of type SCIP_Bool in LP solver has the given value, ignoring unknown parameters

Parameters

lp	current LP data
lpparam	LP parameter
value	value parameter should have

Definition at line 2596 of file lp.c.

References lpCheckIntpar().

Referenced by lpSetFromscratch(), lpSetLPInfo(), and lpSetPresolving().

lpCheckRealpar()

static SCIP_RETCODE lpCheckRealpar ( SCIP_LP *  lp, SCIP_LPPARAM  lpparam, SCIP_Real  value  )

static

checks, that parameter of type SCIP_Real in LP solver has the given value, ignoring unknown parameters

Parameters

lp	current LP data
lpparam	LP parameter
value	value parameter should have

Definition at line 2607 of file lp.c.

References SCIP_Lp::lpi, NULL, SCIP_OKAY, SCIP_PARAMETERUNKNOWN, SCIP_Real, and SCIPlpiGetRealpar().

Referenced by lpSetBarrierconvtol(), lpSetConditionLimit(), lpSetDualfeastol(), lpSetFeastol(), lpSetMarkowitz(), lpSetObjlim(), and lpSetRowrepswitch().

lpSetObjlim()

static SCIP_RETCODE lpSetObjlim ( SCIP_LP *  lp, SCIP_SET *  set, SCIP_Real  objlim, SCIP_Bool *  success  )

static

sets the objective limit of the LP solver

Note that we are always minimizing.

Parameters

lp	current LP data
set	global SCIP settings
objlim	new objective limit
success	pointer to store whether the parameter was actually changed

Definition at line 2643 of file lp.c.

References FALSE, lpCheckRealpar(), lpCutoffDisabled, SCIP_Lp::lpi, SCIP_Lp::lpiobjlim, SCIP_Lp::lpobjval, lpSetRealpar(), SCIP_Lp::lpsolstat, NULL, SCIP_Lp::primalchecked, SCIP_Lp::primalfeasible, SCIP_CALL, SCIP_INVALID, SCIP_LPPAR_OBJLIM, SCIP_LPSOLSTAT_NOTSOLVED, SCIP_OKAY, SCIP_Real, SCIPlpiGetRealpar(), SCIPlpiInfinity(), SCIPsetIsInfinity(), and SCIP_Lp::solved.

Referenced by lpSolveStable().

lpSetFeastol()

static SCIP_RETCODE lpSetFeastol ( SCIP_LP *  lp, SCIP_Real  feastol, SCIP_Bool *  success  )

static

sets the feasibility tolerance of the LP solver

Parameters

lp	current LP data
feastol	new feasibility tolerance
success	pointer to store whether the parameter was actually changed

Definition at line 2694 of file lp.c.

References FALSE, lpCheckRealpar(), SCIP_Lp::lpi, SCIP_Lp::lpifeastol, SCIP_Lp::lpobjval, lpSetRealpar(), SCIP_Lp::lpsolstat, SCIP_Lp::nrows, NULL, SCIP_Lp::primalchecked, SCIP_Lp::primalfeasible, SCIP_CALL, SCIP_INVALID, SCIP_LPPAR_FEASTOL, SCIP_LPSOLSTAT_NOTSOLVED, SCIP_OKAY, SCIP_Real, SCIPlpiGetRealpar(), and SCIP_Lp::solved.

Referenced by lpSolveStable().

lpSetDualfeastol()

static SCIP_RETCODE lpSetDualfeastol ( SCIP_LP *  lp, SCIP_Real  dualfeastol, SCIP_Bool *  success  )

static

sets the reduced costs feasibility tolerance of the LP solver

Parameters

lp	current LP data
dualfeastol	new reduced costs feasibility tolerance
success	pointer to store whether the parameter was actually changed

Definition at line 2737 of file lp.c.

References SCIP_Lp::dualchecked, SCIP_Lp::dualfeasible, FALSE, lpCheckRealpar(), SCIP_Lp::lpi, SCIP_Lp::lpidualfeastol, SCIP_Lp::lpobjval, lpSetRealpar(), SCIP_Lp::lpsolstat, SCIP_Lp::nrows, NULL, SCIP_CALL, SCIP_INVALID, SCIP_LPPAR_DUALFEASTOL, SCIP_LPSOLSTAT_NOTSOLVED, SCIP_OKAY, SCIP_Real, SCIPlpiGetRealpar(), and SCIP_Lp::solved.

Referenced by lpSolveStable().

lpSetBarrierconvtol()

static SCIP_RETCODE lpSetBarrierconvtol ( SCIP_LP *  lp, SCIP_Real  barrierconvtol, SCIP_Bool *  success  )

static

sets the convergence tolerance used in barrier algorithm of the LP solver

Parameters

lp	current LP data
barrierconvtol	new convergence tolerance used in barrier algorithm
success	pointer to store whether the parameter was actually changed

Definition at line 2780 of file lp.c.

References SCIP_Lp::dualchecked, SCIP_Lp::dualfeasible, FALSE, SCIP_Lp::lastlpalgo, lpCheckRealpar(), SCIP_Lp::lpi, SCIP_Lp::lpibarrierconvtol, SCIP_Lp::lpobjval, lpSetRealpar(), SCIP_Lp::lpsolstat, SCIP_Lp::nrows, NULL, SCIP_CALL, SCIP_INVALID, SCIP_LPALGO_BARRIER, SCIP_LPALGO_BARRIERCROSSOVER, SCIP_LPPAR_BARRIERCONVTOL, SCIP_LPSOLSTAT_NOTSOLVED, SCIP_OKAY, SCIP_Real, SCIPlpiGetRealpar(), and SCIP_Lp::solved.

Referenced by lpSolveStable().

lpSetFromscratch()

static SCIP_RETCODE lpSetFromscratch ( SCIP_LP *  lp, SCIP_Bool  fromscratch, SCIP_Bool *  success  )

static

sets the FROMSCRATCH setting of the LP solver

Parameters

lp	current LP data
fromscratch	new FROMSCRATCH setting
success	pointer to store whether the parameter was successfully changed

Definition at line 2824 of file lp.c.

References FALSE, lpCheckBoolpar(), SCIP_Lp::lpifromscratch, lpSetBoolpar(), NULL, SCIP_CALL, SCIP_LPPAR_FROMSCRATCH, and SCIP_OKAY.

Referenced by lpSolveStable(), and SCIPlpSolveAndEval().

lpSetFastmip()

static SCIP_RETCODE lpSetFastmip ( SCIP_LP *  lp, int  fastmip, SCIP_Bool *  success  )

static

sets the FASTMIP setting of the LP solver

Parameters

lp	current LP data
fastmip	new FASTMIP setting
success	pointer to store whether the parameter was successfully changed

Definition at line 2849 of file lp.c.

References FALSE, lpCheckIntpar(), SCIP_Lp::lpifastmip, lpSetIntpar(), NULL, SCIP_CALL, SCIP_LPPAR_FASTMIP, SCIP_OKAY, and SCIP_Lp::solved.

Referenced by lpSolveStable().

lpSetScaling()

static SCIP_RETCODE lpSetScaling ( SCIP_LP *  lp, int  scaling, SCIP_Bool *  success  )

static

sets the SCALING setting of the LP solver

Parameters

lp	current LP data
scaling	new SCALING setting
success	pointer to store whether the parameter was successfully changed

Definition at line 2880 of file lp.c.

References FALSE, lpCheckIntpar(), SCIP_Lp::lpiscaling, lpSetIntpar(), NULL, SCIP_CALL, SCIP_LPPAR_SCALING, and SCIP_OKAY.

Referenced by lpSolveStable().

lpSetThreads()

static SCIP_RETCODE lpSetThreads ( SCIP_LP *  lp, int  threads, SCIP_Bool *  success  )

static

sets the number of THREADS of the LP solver

Parameters

lp	current LP data
threads	new number of threads used to solve the LP
success	pointer to store whether the parameter was successfully changed

Definition at line 2905 of file lp.c.

References FALSE, lpCheckIntpar(), SCIP_Lp::lpithreads, lpSetIntpar(), NULL, SCIP_CALL, SCIP_LPPAR_THREADS, and SCIP_OKAY.

Referenced by lpSolveStable().

lpSetPresolving()

static SCIP_RETCODE lpSetPresolving ( SCIP_LP *  lp, SCIP_Bool  presolving, SCIP_Bool *  success  )

static

sets the PRESOLVING setting of the LP solver

Parameters

lp	current LP data
presolving	new PRESOLVING setting
success	pointer to store whether the parameter was successfully changed

Definition at line 2930 of file lp.c.

References FALSE, lpCheckBoolpar(), SCIP_Lp::lpipresolving, lpSetBoolpar(), NULL, SCIP_CALL, SCIP_LPPAR_PRESOLVING, and SCIP_OKAY.

Referenced by lpSolveStable().

lpSetRowrepswitch()

static SCIP_RETCODE lpSetRowrepswitch ( SCIP_LP *  lp, SCIP_Real  rowrepswitch, SCIP_Bool *  success  )

static

sets the ROWREPSWITCH setting of the LP solver

Parameters

lp	current LP data
rowrepswitch	new ROWREPSWITCH value
success	pointer to store whether the parameter was successfully changed

Definition at line 2955 of file lp.c.

References FALSE, lpCheckRealpar(), SCIP_Lp::lpirowrepswitch, lpSetRealpar(), NULL, SCIP_CALL, SCIP_LPPAR_ROWREPSWITCH, and SCIP_OKAY.

Referenced by lpSolveStable().

lpSetIterationLimit()

static SCIP_RETCODE lpSetIterationLimit ( SCIP_LP *  lp, int  itlim  )

static

sets the iteration limit of the LP solver

Parameters

lp	current LP data
itlim	maximal number of LP iterations to perform, or -1 for no limit

Definition at line 2980 of file lp.c.

References FALSE, lpCheckIntpar(), SCIP_Lp::lpiitlim, SCIP_Lp::lpobjval, lpSetIntpar(), SCIP_Lp::lpsolstat, NULL, SCIP_Bool, SCIP_CALL, SCIP_INVALID, SCIP_LPPAR_LPITLIM, SCIP_LPSOLSTAT_NOTSOLVED, SCIP_OKAY, and SCIP_Lp::solved.

Referenced by lpSolveStable(), and SCIPlpEndDive().

lpSetPricing()

static SCIP_RETCODE lpSetPricing ( SCIP_LP *  lp, SCIP_PRICING  pricing  )

static

sets the pricing strategy of the LP solver

Parameters

lp	current LP data
pricing	pricing strategy

Definition at line 3016 of file lp.c.

References lpCheckIntpar(), SCIP_Lp::lpipricing, lpSetIntpar(), NULL, pricing(), SCIP_Bool, SCIP_CALL, SCIP_LPPAR_PRICING, and SCIP_OKAY.

Referenced by lpSetPricingChar().

lpSetPricingChar()

static SCIP_RETCODE lpSetPricingChar ( SCIP_LP *  lp, char  pricingchar  )

static

sets the pricing strategy of the LP solver (given the character representation of the strategy)

Parameters

lp	current LP data
pricingchar	character representing the pricing strategy

Definition at line 3039 of file lp.c.

References lpSetPricing(), pricing(), SCIP_CALL, SCIP_INVALIDDATA, SCIP_OKAY, SCIP_PRICING_AUTO, SCIP_PRICING_DEVEX, SCIP_PRICING_FULL, SCIP_PRICING_LPIDEFAULT, SCIP_PRICING_PARTIAL, SCIP_PRICING_STEEP, SCIP_PRICING_STEEPQSTART, and SCIPerrorMessage.

Referenced by lpSolveStable().

lpSetLPInfo()

static SCIP_RETCODE lpSetLPInfo ( SCIP_LP *  lp, SCIP_Bool  lpinfo  )

static

sets the verbosity of the LP solver

Parameters

lp	current LP data
lpinfo	should the LP solver display status messages?

Definition at line 3081 of file lp.c.

References lpCheckBoolpar(), SCIP_Lp::lpilpinfo, lpSetBoolpar(), NULL, SCIP_Bool, SCIP_CALL, SCIP_LPPAR_LPINFO, and SCIP_OKAY.

Referenced by lpSolveStable().

lpSetConditionLimit()

static SCIP_RETCODE lpSetConditionLimit ( SCIP_LP *  lp, SCIP_Real  condlimit, SCIP_Bool *  success  )

static

sets the CONDITIONLIMIT setting of the LP solver

Parameters

lp	current LP data
condlimit	new CONDITIONLIMIT value
success	pointer to store whether the parameter was successfully changed

Definition at line 3104 of file lp.c.

References FALSE, lpCheckRealpar(), SCIP_Lp::lpiconditionlimit, lpSetRealpar(), NULL, SCIP_CALL, SCIP_LPPAR_CONDITIONLIMIT, and SCIP_OKAY.

Referenced by lpSolveStable().

lpSetMarkowitz()

static SCIP_RETCODE lpSetMarkowitz ( SCIP_LP *  lp, SCIP_Real  threshhold, SCIP_Bool *  success  )

static

sets the MARKOWITZ setting of the LP solver

Parameters

lp	current LP data
threshhold	new MARKOWITZ value
success	pointer to store whether the parameter was successfully changed

Definition at line 3129 of file lp.c.

References FALSE, lpCheckRealpar(), SCIP_Lp::lpimarkowitz, lpSetRealpar(), NULL, SCIP_CALL, SCIP_LPPAR_MARKOWITZ, and SCIP_OKAY.

Referenced by lpSolveStable().

lpSetTiming()

static SCIP_RETCODE lpSetTiming ( SCIP_LP *  lp, SCIP_CLOCKTYPE  timing, SCIP_Bool  enabled, SCIP_Bool *  success  )

static

sets the type of timer of the LP solver

Parameters

lp	current LP data
timing	new timing value
enabled	is timing enabled?
success	pointer to store whether the parameter was successfully changed

Definition at line 3154 of file lp.c.

References FALSE, lpCheckIntpar(), SCIP_Lp::lpitiming, lpSetIntpar(), NULL, SCIP_CALL, SCIP_CLOCKTYPE_CPU, SCIP_CLOCKTYPE_WALL, SCIP_LPPAR_TIMING, and SCIP_OKAY.

Referenced by lpSolveStable().

lpSetRandomseed()

static SCIP_RETCODE lpSetRandomseed ( SCIP_LP *  lp, int  randomseed, SCIP_Bool *  success  )

static

sets the initial random seed of the LP solver

Parameters

lp	current LP data
randomseed	new initial random seed
success	pointer to store whether the parameter was successfully changed

Definition at line 3188 of file lp.c.

References FALSE, SCIP_Lp::lpirandomseed, lpSetIntpar(), NULL, SCIP_CALL, SCIP_LPPAR_RANDOMSEED, SCIP_OKAY, and TRUE.

Referenced by lpSolveStable().

lpSetSolutionPolishing()

static SCIP_RETCODE lpSetSolutionPolishing ( SCIP_LP *  lp, SCIP_Bool  polishing, SCIP_Bool *  success  )

static

sets the LP solution polishing method

Parameters

lp	current LP data
polishing	LP solution polishing activated (0: disabled, 1: enabled)
success	pointer to store whether the parameter was successfully changed

Definition at line 3218 of file lp.c.

References FALSE, SCIP_Lp::lpisolutionpolishing, lpSetIntpar(), NULL, SCIP_CALL, SCIP_LPPAR_POLISHING, and SCIP_OKAY.

Referenced by lpSolveStable().

lpSetRefactorInterval()

static SCIP_RETCODE lpSetRefactorInterval ( SCIP_LP *  lp, int  refactor, SCIP_Bool *  success  )

static

sets the LP refactorization interval

Parameters

lp	current LP data
refactor	LP refactorization interval (0: automatic)
success	pointer to store whether the parameter was successfully changed

Definition at line 3241 of file lp.c.

References FALSE, SCIP_Lp::lpirefactorinterval, lpSetIntpar(), NULL, SCIP_CALL, SCIP_LPPAR_REFACTOR, and SCIP_OKAY.

Referenced by lpSolveStable().

SCIPcolCreate()

SCIP_RETCODE SCIPcolCreate	(	SCIP_COL **	col,
		BMS_BLKMEM *	blkmem,
		SCIP_SET *	set,
		SCIP_STAT *	stat,
		SCIP_VAR *	var,
		int	len,
		SCIP_ROW **	rows,
		SCIP_Real *	vals,
		SCIP_Bool	removable
	)

creates an LP column

Parameters

col	pointer to column data
blkmem	block memory
set	global SCIP settings
stat	problem statistics
var	variable, this column represents
len	number of nonzeros in the column
rows	array with rows of column entries
vals	array with coefficients of column entries
removable	should the column be removed from the LP due to aging or cleanup?

Definition at line 3268 of file lp.c.

References BMSallocBlockMemory, BMSallocBlockMemoryArray, BMSduplicateBlockMemoryArray, FALSE, SCIP_Stat::ncolidx, NULL, SCIP_Var::obj, SCIP_ALLOC, SCIP_BASESTAT_ZERO, SCIP_INVALID, SCIP_OKAY, SCIPsetIsZero(), SCIPstatIncrement, SCIPvarGetLbLazy(), SCIPvarGetLbLocal(), SCIPvarGetObj(), SCIPvarGetProbindex(), SCIPvarGetUbLazy(), SCIPvarGetUbLocal(), SCIPvarGetUnchangedObj(), SCIPvarIsIntegral(), and TRUE.

Referenced by SCIPvarColumn().

SCIPcolFree()

SCIP_RETCODE SCIPcolFree	(	SCIP_COL **	col,
		BMS_BLKMEM *	blkmem,
		SCIP_SET *	set,
		SCIP_EVENTQUEUE *	eventqueue,
		SCIP_LP *	lp
	)

frees an LP column

Parameters

col	pointer to LP column
blkmem	block memory
set	global SCIP settings
eventqueue	event queue
lp	current LP data

Definition at line 3366 of file lp.c.

References BMSfreeBlockMemory, BMSfreeBlockMemoryArrayNull, BMSfreeBlockMemoryNull, colUnlink(), NULL, SCIP_CALL, SCIP_OKAY, SCIP_VARSTATUS_COLUMN, and SCIPvarGetStatus().

Referenced by SCIPvarLoose(), and varFree().

SCIPcolPrint()

void SCIPcolPrint	(	SCIP_COL *	col,
		SCIP_MESSAGEHDLR *	messagehdlr,
		FILE *	file
	)

output column to file stream

Parameters

col	LP column
messagehdlr	message handler
file	output file (or NULL for standard output)

Definition at line 3396 of file lp.c.

References SCIP_Col::lb, SCIP_Col::len, SCIP_Row::name, NULL, SCIP_Col::obj, r, SCIP_Col::rows, SCIPmessageFPrintInfo(), SCIP_Col::ub, SCIP_Col::vals, and SCIP_Col::var.

SCIPcolAddCoef()

SCIP_RETCODE SCIPcolAddCoef	(	SCIP_COL *	col,
		BMS_BLKMEM *	blkmem,
		SCIP_SET *	set,
		SCIP_EVENTQUEUE *	eventqueue,
		SCIP_LP *	lp,
		SCIP_ROW *	row,
		SCIP_Real	val
	)

adds a previously non existing coefficient to an LP column

Parameters

col	LP column
blkmem	block memory
set	global SCIP settings
eventqueue	event queue
lp	current LP data
row	LP row
val	value of coefficient

Definition at line 3436 of file lp.c.

References checkLinks, colAddCoef(), SCIP_Lp::diving, NULL, SCIP_CALL, and SCIP_OKAY.

SCIPcolDelCoef()

SCIP_RETCODE SCIPcolDelCoef	(	SCIP_COL *	col,
		BMS_BLKMEM *	blkmem,
		SCIP_SET *	set,
		SCIP_EVENTQUEUE *	eventqueue,
		SCIP_LP *	lp,
		SCIP_ROW *	row
	)

deletes existing coefficient from column

Parameters

col	column to be changed
blkmem	block memory
set	global SCIP settings
eventqueue	event queue
lp	current LP data
row	coefficient to be deleted

Definition at line 3457 of file lp.c.

References checkLinks, colDelCoefPos(), SCIP_Row::cols, SCIP_Row::cols_index, colSearchCoef(), SCIP_Lp::diving, SCIP_Col::index, SCIP_Col::linkpos, SCIP_Row::name, NULL, rowDelCoefPos(), SCIP_Col::rows, SCIP_CALL, SCIP_INVALIDDATA, SCIP_OKAY, SCIPerrorMessage, SCIPsetIsEQ(), SCIPvarGetName(), SCIP_Col::vals, SCIP_Row::vals, and SCIP_Col::var.

SCIPcolChgCoef()

SCIP_RETCODE SCIPcolChgCoef	(	SCIP_COL *	col,
		BMS_BLKMEM *	blkmem,
		SCIP_SET *	set,
		SCIP_EVENTQUEUE *	eventqueue,
		SCIP_LP *	lp,
		SCIP_ROW *	row,
		SCIP_Real	val
	)

changes or adds a coefficient to an LP column

Parameters

col	LP column
blkmem	block memory
set	global SCIP settings
eventqueue	event queue
lp	current LP data
row	LP row
val	value of coefficient

Definition at line 3502 of file lp.c.

References checkLinks, colAddCoef(), colChgCoefPos(), SCIP_Row::cols, SCIP_Row::cols_index, colSearchCoef(), SCIP_Lp::diving, SCIP_Col::index, SCIP_Col::linkpos, NULL, rowChgCoefPos(), SCIP_Col::rows, SCIP_CALL, SCIP_OKAY, SCIPsetIsEQ(), SCIP_Col::vals, and SCIP_Row::vals.

SCIPcolIncCoef()

SCIP_RETCODE SCIPcolIncCoef	(	SCIP_COL *	col,
		BMS_BLKMEM *	blkmem,
		SCIP_SET *	set,
		SCIP_EVENTQUEUE *	eventqueue,
		SCIP_LP *	lp,
		SCIP_ROW *	row,
		SCIP_Real	incval
	)

increases value of an existing or non-existing coefficient in an LP column

Parameters

col	LP column
blkmem	block memory
set	global SCIP settings
eventqueue	event queue
lp	current LP data
row	LP row
incval	value to add to the coefficient

Definition at line 3553 of file lp.c.

References checkLinks, colAddCoef(), colChgCoefPos(), SCIP_Row::cols, SCIP_Row::cols_index, colSearchCoef(), SCIP_Lp::diving, SCIP_Col::index, SCIP_Col::linkpos, NULL, rowChgCoefPos(), SCIP_Col::rows, SCIP_CALL, SCIP_OKAY, SCIPsetIsEQ(), SCIPsetIsZero(), SCIP_Col::vals, and SCIP_Row::vals.

insertColChgcols()

static SCIP_RETCODE insertColChgcols ( SCIP_COL *  col, SCIP_SET *  set, SCIP_LP *  lp  )

static

insert column in the chgcols list (if not already there)

Parameters

col	LP column to change
set	global SCIP settings
lp	current LP data

Definition at line 3608 of file lp.c.

References SCIP_Lp::chgcols, ensureChgcolsSize(), FALSE, SCIP_Lp::flushed, SCIP_Col::lbchanged, SCIP_Lp::nchgcols, SCIP_Col::objchanged, SCIP_CALL, SCIP_OKAY, and SCIP_Col::ubchanged.

Referenced by SCIPcolChgLb(), SCIPcolChgObj(), SCIPcolChgUb(), and updateLazyBounds().

isNewValueUnreliable()

static SCIP_Bool isNewValueUnreliable ( SCIP_SET *  set, SCIP_Real  newvalue, SCIP_Real  oldvalue  )

static

Is the new value reliable or may we have cancellation?

Note

: Here we only consider cancellations which can occur during decreasing the oldvalue to newvalue; not the cancellations which can occur during increasing the oldvalue to the newvalue

Parameters

set	global SCIP settings
newvalue	new value
oldvalue	old reliable value

Definition at line 3633 of file lp.c.

References NULL, REALABS, SCIP_INVALID, SCIP_Real, and SCIPsetIsZero().

Referenced by lpUpdateObjNorms().

lpUpdateObjNorms()

static void lpUpdateObjNorms ( SCIP_LP *  lp, SCIP_SET *  set, SCIP_Real  oldobj, SCIP_Real  newobj  )

static

update norms of objective function vector

Parameters

lp	current LP data
set	global SCIP settings
oldobj	old objective value of variable
newobj	new objective value of variable

Definition at line 3651 of file lp.c.

References isNewValueUnreliable(), MAX, SCIP_Lp::objsqrnorm, SCIP_Lp::objsqrnormunreliable, SCIP_Lp::objsumnorm, REALABS, SCIP_Real, SCIPsetIsGE(), SCIPsetIsLT(), and TRUE.

Referenced by lpDelColset(), SCIPcolChgObj(), SCIPlpAddCol(), and SCIPlpShrinkCols().

SCIPcolChgObj()

SCIP_RETCODE SCIPcolChgObj	(	SCIP_COL *	col,
		SCIP_SET *	set,
		SCIP_LP *	lp,
		SCIP_Real	newobj
	)

changes objective value of column

Parameters

col	LP column to change
set	global SCIP settings
lp	current LP data
newobj	new objective value

Definition at line 3687 of file lp.c.

References SCIP_Lp::divingobjchg, FALSE, SCIP_Lp::flushed, insertColChgcols(), SCIP_Col::lb, SCIP_Col::lpipos, lpUpdateObjNorms(), SCIP_Lp::nchgcols, NULL, SCIP_Col::obj, SCIP_Col::objchanged, SCIP_CALL, SCIP_OKAY, SCIP_Real, SCIP_VARSTATUS_COLUMN, SCIPsetDebugMsg, SCIPsetIsEQ(), SCIPsetIsZero(), SCIPvarGetCol(), SCIPvarGetName(), SCIPvarGetStatus(), SCIPvarGetUnchangedObj(), TRUE, SCIP_Col::ub, SCIP_Col::unchangedobj, and SCIP_Col::var.

Referenced by SCIPeventProcess(), SCIPlpEndDive(), and SCIPvarChgObjDive().

SCIPcolChgLb()

SCIP_RETCODE SCIPcolChgLb	(	SCIP_COL *	col,
		SCIP_SET *	set,
		SCIP_LP *	lp,
		SCIP_Real	newlb
	)

changes lower bound of column

Parameters

col	LP column to change
set	global SCIP settings
lp	current LP data
newlb	new lower bound value

Definition at line 3746 of file lp.c.

References FALSE, SCIP_Lp::flushed, insertColChgcols(), SCIP_Col::lb, SCIP_Col::lbchanged, SCIP_Col::lpipos, SCIP_Lp::nchgcols, NULL, SCIP_Col::obj, SCIP_CALL, SCIP_OKAY, SCIP_VARSTATUS_COLUMN, SCIPsetDebugMsg, SCIPsetIsEQ(), SCIPsetIsZero(), SCIPvarGetCol(), SCIPvarGetName(), SCIPvarGetStatus(), TRUE, and SCIP_Col::var.

Referenced by SCIPeventProcess(), SCIPlpEndDive(), and SCIPvarChgLbDive().

SCIPcolChgUb()

SCIP_RETCODE SCIPcolChgUb	(	SCIP_COL *	col,
		SCIP_SET *	set,
		SCIP_LP *	lp,
		SCIP_Real	newub
	)

changes upper bound of column

Parameters

col	LP column to change
set	global SCIP settings
lp	current LP data
newub	new upper bound value

Definition at line 3791 of file lp.c.

References FALSE, SCIP_Lp::flushed, insertColChgcols(), SCIP_Col::lpipos, SCIP_Lp::nchgcols, NULL, SCIP_Col::obj, SCIP_CALL, SCIP_OKAY, SCIP_VARSTATUS_COLUMN, SCIPsetDebugMsg, SCIPsetIsEQ(), SCIPsetIsZero(), SCIPvarGetCol(), SCIPvarGetName(), SCIPvarGetStatus(), TRUE, SCIP_Col::ub, SCIP_Col::ubchanged, and SCIP_Col::var.

Referenced by SCIPeventProcess(), SCIPlpEndDive(), and SCIPvarChgUbDive().

SCIPcolCalcRedcost()

SCIP_Real SCIPcolCalcRedcost	(	SCIP_COL *	col,
		SCIP_Real *	dualsol
	)

calculates the reduced costs of a column using the given dual solution vector

Parameters

col	LP column
dualsol	dual solution vector for current LP rows

Definition at line 3836 of file lp.c.

References SCIP_Col::linkpos, SCIP_Row::lppos, SCIP_Col::nlprows, NULL, SCIP_Col::nunlinked, SCIP_Col::obj, SCIP_Col::rows, SCIP_Real, SCIP_VARSTATUS_COLUMN, SCIPvarGetCol(), SCIPvarGetStatus(), SCIP_Col::vals, and SCIP_Col::var.

colCalcInternalRedcost()

static SCIP_Real colCalcInternalRedcost ( SCIP_COL *  col )

static

calculates the reduced costs of a column using the dual solution stored in the rows

Parameters

col

LP column

Definition at line 3888 of file lp.c.

References SCIP_Row::dualsol, SCIP_Col::linkpos, SCIP_Row::lppos, SCIP_Col::nlprows, NULL, SCIP_Col::nunlinked, SCIP_Col::obj, SCIP_Col::rows, SCIP_INVALID, SCIP_Real, SCIP_VARSTATUS_COLUMN, SCIPvarGetCol(), SCIPvarGetStatus(), SCIP_Col::vals, and SCIP_Col::var.

Referenced by SCIPcolGetRedcost().

SCIPcolGetRedcost()

SCIP_Real SCIPcolGetRedcost	(	SCIP_COL *	col,
		SCIP_STAT *	stat,
		SCIP_LP *	lp
	)

gets the reduced costs of a column in last LP or after recalculation

Parameters

col	LP column
stat	problem statistics
lp	current LP data

Definition at line 3941 of file lp.c.

References colCalcInternalRedcost(), SCIP_Stat::lpcount, NULL, SCIP_Col::redcost, SCIP_INVALID, SCIP_Col::validredcostlp, and SCIP_Lp::validsollp.

Referenced by getImplVarRedcost(), SCIPcolGetFeasibility(), SCIPgetColRedcost(), SCIPlpGetDegeneracy(), SCIPprobUpdateBestRootSol(), and SCIPvarGetImplRedcost().

SCIPcolGetFeasibility()

SCIP_Real SCIPcolGetFeasibility	(	SCIP_COL *	col,
		SCIP_SET *	set,
		SCIP_STAT *	stat,
		SCIP_LP *	lp
	)

gets the feasibility of (the dual row of) a column in last LP or after recalculation

Parameters

col	LP column
set	global SCIP settings
stat	problem statistics
lp	current LP data

Definition at line 3965 of file lp.c.

References SCIP_Col::lb, SCIP_Stat::lpcount, NULL, REALABS, SCIP_Real, SCIPcolGetRedcost(), SCIPsetInfinity(), SCIPsetIsEQ(), SCIPsetIsNegative(), SCIPsetIsPositive(), SCIP_Col::ub, and SCIP_Lp::validsollp.

Referenced by SCIPpricestoreAddProbVars().

SCIPcolCalcFarkasCoef()

SCIP_Real SCIPcolCalcFarkasCoef	(	SCIP_COL *	col,
		SCIP_Real *	dualfarkas
	)

calculates the Farkas coefficient y^T A_i of a column i using the given dual Farkas vector y

Parameters

col	LP column
dualfarkas	dense dual Farkas vector for current LP rows

Definition at line 4019 of file lp.c.

References SCIP_Col::linkpos, SCIP_Row::lppos, SCIP_Col::nlprows, NULL, SCIP_Col::nunlinked, SCIP_Col::rows, SCIP_Real, SCIP_VARSTATUS_COLUMN, SCIPvarGetCol(), SCIPvarGetStatus(), SCIP_Col::vals, and SCIP_Col::var.

colCalcInternalFarkasCoef()

static SCIP_Real colCalcInternalFarkasCoef ( SCIP_COL *  col )

static

gets the Farkas coefficient y^T A_i of a column i in last LP (which must be infeasible)

Parameters

col

LP column

Definition at line 4071 of file lp.c.

References SCIP_Row::dualfarkas, SCIP_Col::linkpos, SCIP_Row::lppos, SCIP_Col::nlprows, NULL, SCIP_Col::nunlinked, SCIP_Col::rows, SCIP_INVALID, SCIP_Real, SCIP_VARSTATUS_COLUMN, SCIPvarGetCol(), SCIPvarGetStatus(), SCIP_Col::vals, and SCIP_Col::var.

Referenced by SCIPcolGetFarkasCoef().

SCIPcolGetFarkasCoef()

SCIP_Real SCIPcolGetFarkasCoef	(	SCIP_COL *	col,
		SCIP_STAT *	stat,
		SCIP_LP *	lp
	)

gets the Farkas coefficient of a column in last LP (which must be infeasible)

Parameters

col	LP column
stat	problem statistics
lp	current LP data

Definition at line 4124 of file lp.c.

References colCalcInternalFarkasCoef(), SCIP_Col::farkascoef, SCIP_Stat::lpcount, NULL, SCIP_INVALID, SCIP_Col::validfarkaslp, and SCIP_Lp::validfarkaslp.

Referenced by SCIPcolGetFarkasValue(), and SCIPgetColFarkasCoef().

SCIPcolGetFarkasValue()

SCIP_Real SCIPcolGetFarkasValue	(	SCIP_COL *	col,
		SCIP_STAT *	stat,
		SCIP_LP *	lp
	)

gets the Farkas value of a column in last LP (which must be infeasible), i.e. the Farkas coefficient y^T A_i times the best bound for this coefficient, i.e. max{y^T A_i x_i | lb <= x_i <= ub}

Parameters

col	LP column
stat	problem statistics
lp	current LP data

Definition at line 4150 of file lp.c.

References SCIP_Col::lb, NULL, SCIP_Real, SCIPcolGetFarkasCoef(), and SCIP_Col::ub.

Referenced by SCIPpricestoreAddProbVars().

SCIPlpStartStrongbranch()

SCIP_RETCODE SCIPlpStartStrongbranch

(

SCIP_LP *

lp

)

start strong branching - call before any strong branching

Parameters

lp

LP data

Definition at line 4169 of file lp.c.

References SCIP_Lp::lpi, NULL, SCIP_CALL, SCIP_OKAY, SCIPdebugMessage, SCIPlpiStartStrongbranch(), SCIP_Lp::strongbranching, and TRUE.

Referenced by SCIPstartStrongbranch().

SCIPlpEndStrongbranch()

SCIP_RETCODE SCIPlpEndStrongbranch

(

SCIP_LP *

lp

)

end strong branching - call after any strong branching

Parameters

lp

LP data

Definition at line 4184 of file lp.c.

References FALSE, SCIP_Lp::lpi, NULL, SCIP_CALL, SCIP_OKAY, SCIPdebugMessage, SCIPlpiEndStrongbranch(), and SCIP_Lp::strongbranching.

Referenced by SCIPendStrongbranch().

SCIPcolSetStrongbranchData()

void SCIPcolSetStrongbranchData	(	SCIP_COL *	col,
		SCIP_SET *	set,
		SCIP_STAT *	stat,
		SCIP_LP *	lp,
		SCIP_Real	lpobjval,
		SCIP_Real	primsol,
		SCIP_Real	sbdown,
		SCIP_Real	sbup,
		SCIP_Bool	sbdownvalid,
		SCIP_Bool	sbupvalid,
		SCIP_Longint	iter,
		int	itlim
	)

sets strong branching information for a column variable

Parameters

col	LP column
set	global SCIP settings
stat	dynamic problem statistics
lp	LP data
lpobjval	objective value of the current LP
primsol	primal solution value of the column in the current LP
sbdown	dual bound after branching column down
sbup	dual bound after branching column up
sbdownvalid	is the returned down value a valid dual bound?
sbupvalid	is the returned up value a valid dual bound?
iter	total number of strong branching iterations
itlim	iteration limit applied to the strong branching call

Definition at line 4199 of file lp.c.

References SCIP_Lp::cols, SCIP_Lp::cutoffbound, SCIP_Col::lpipos, SCIP_Col::lppos, SCIP_Lp::ncols, SCIP_Stat::nlps, SCIP_Stat::nnodes, SCIP_Col::nsbcalls, NULL, SCIP_Col::sbdown, SCIP_Col::sbdownvalid, SCIP_Col::sbitlim, SCIP_Col::sblpobjval, SCIP_Col::sbnode, SCIP_Col::sbsolval, SCIP_Col::sbup, SCIP_Col::sbupvalid, SCIP_VARSTATUS_COLUMN, SCIPcolIsIntegral(), SCIPstatAdd, SCIPstatIncrement, SCIPvarGetCol(), SCIPvarGetStatus(), SCIPvarIsIntegral(), SCIP_Lp::strongbranchprobing, SCIP_Col::validsblp, and SCIP_Col::var.

Referenced by SCIPgetVarStrongbranchWithPropagation(), and SCIPsetVarStrongbranchData().

SCIPcolInvalidateStrongbranchData()

void SCIPcolInvalidateStrongbranchData	(	SCIP_COL *	col,
		SCIP_SET *	set,
		SCIP_STAT *	stat,
		SCIP_LP *	lp
	)

invalidates strong branching information for a column variable

Parameters

col	LP column
set	global SCIP settings
stat	dynamic problem statistics
lp	LP data

Definition at line 4253 of file lp.c.

References SCIP_Lp::cols, FALSE, SCIP_Col::lpipos, SCIP_Col::lppos, SCIP_Lp::ncols, NULL, SCIP_Col::sbdown, SCIP_Col::sbdownvalid, SCIP_Col::sbitlim, SCIP_Col::sblpobjval, SCIP_Col::sbnode, SCIP_Col::sbsolval, SCIP_Col::sbup, SCIP_Col::sbupvalid, SCIP_INVALID, SCIP_VARSTATUS_COLUMN, SCIPcolIsIntegral(), SCIPvarGetCol(), SCIPvarGetStatus(), SCIPvarIsIntegral(), SCIP_Lp::strongbranchprobing, SCIP_Col::validsblp, and SCIP_Col::var.

Referenced by SCIPgetVarStrongbranchWithPropagation().

SCIPcolGetStrongbranch()

SCIP_RETCODE SCIPcolGetStrongbranch	(	SCIP_COL *	col,
		SCIP_Bool	integral,
		SCIP_SET *	set,
		SCIP_STAT *	stat,
		SCIP_PROB *	prob,
		SCIP_LP *	lp,
		int	itlim,
		SCIP_Bool	updatecol,
		SCIP_Bool	updatestat,
		SCIP_Real *	down,
		SCIP_Real *	up,
		SCIP_Bool *	downvalid,
		SCIP_Bool *	upvalid,
		SCIP_Bool *	lperror
	)

gets strong branching information on a column variable

Parameters

col	LP column
integral	should integral strong branching be performed?
set	global SCIP settings
stat	dynamic problem statistics
prob	problem data
lp	LP data
itlim	iteration limit for strong branchings
updatecol	should col be updated, or should it stay in its current state ?
updatestat	should stat be updated, or should it stay in its current state ?
down	stores dual bound after branching column down
up	stores dual bound after branching column up
downvalid	stores whether the returned down value is a valid dual bound, or NULL; otherwise, it can only be used as an estimate value
upvalid	stores whether the returned up value is a valid dual bound, or NULL; otherwise, it can only be used as an estimate value
lperror	pointer to store whether an unresolved LP error occurred

Definition at line 4288 of file lp.c.

References SCIP_Lp::cols, SCIP_Lp::cutoffbound, FALSE, SCIP_Lp::flushed, getFiniteLooseObjval(), SCIP_Lp::looseobjvalinf, SCIP_Stat::lpcount, SCIP_Lp::lpi, SCIP_Col::lpipos, SCIP_Lp::lpobjval, SCIP_Col::lppos, SCIP_Lp::lpsolstat, SCIP_Lp::ncols, SCIP_Stat::nduallpiterations, SCIP_Stat::nduallps, SCIP_Stat::ndualresolvelpiterations, SCIP_Stat::ndualresolvelps, SCIP_Stat::nlps, SCIP_Stat::nnodes, SCIP_Stat::nprimallpiterations, SCIP_Stat::nprimallps, SCIP_Stat::nprimalresolvelpiterations, SCIP_Stat::nprimalresolvelps, SCIP_Col::nsbcalls, NULL, SCIP_Col::primsol, SCIP_Col::sbdown, SCIP_Col::sbdownvalid, SCIP_Col::sbitlim, SCIP_Col::sblpobjval, SCIP_Col::sbnode, SCIP_Col::sbsolval, SCIP_Col::sbup, SCIP_Col::sbupvalid, SCIP_Bool, SCIP_CALL, SCIP_INVALID, SCIP_Longint, SCIP_LPERROR, SCIP_LPSOLSTAT_OPTIMAL, SCIP_OKAY, SCIP_Real, SCIP_VARSTATUS_COLUMN, SCIPclockStart(), SCIPclockStop(), SCIPcolIsIntegral(), SCIPlpGetObjval(), SCIPlpiStrongbranchFrac(), SCIPlpiStrongbranchInt(), SCIPsetDebugMsg, SCIPsetInfinity(), SCIPsetIsFeasIntegral(), SCIPsetIsIntegral(), SCIPstatAdd, SCIPstatIncrement, SCIPvarGetCol(), SCIPvarGetName(), SCIPvarGetStatus(), SCIPvarIsIntegral(), SCIP_Lp::solved, SCIP_Lp::strongbranching, SCIP_Stat::strongbranchtime, TRUE, SCIP_Col::validsblp, SCIP_Lp::validsollp, and SCIP_Col::var.

Referenced by SCIPgetVarStrongbranchFrac(), and SCIPgetVarStrongbranchInt().

SCIPcolGetStrongbranches()

SCIP_RETCODE SCIPcolGetStrongbranches	(	SCIP_COL **	cols,
		int	ncols,
		SCIP_Bool	integral,
		SCIP_SET *	set,
		SCIP_STAT *	stat,
		SCIP_PROB *	prob,
		SCIP_LP *	lp,
		int	itlim,
		SCIP_Real *	down,
		SCIP_Real *	up,
		SCIP_Bool *	downvalid,
		SCIP_Bool *	upvalid,
		SCIP_Bool *	lperror
	)

gets strong branching information on column variables

Parameters

cols	LP columns
ncols	number of columns
integral	should integral strong branching be performed?
set	global SCIP settings
stat	dynamic problem statistics
prob	problem data
lp	LP data
itlim	iteration limit for strong branchings
down	stores dual bounds after branching columns down
up	stores dual bounds after branching columns up
downvalid	stores whether the returned down values are valid dual bounds, or NULL; otherwise, they can only be used as an estimate value
upvalid	stores whether the returned up values are valid dual bounds, or NULL; otherwise, they can only be used as an estimate value
lperror	pointer to store whether an unresolved LP error occurred

Definition at line 4473 of file lp.c.

References SCIP_Lp::cols, SCIP_Lp::cutoffbound, FALSE, SCIP_Lp::flushed, getFiniteLooseObjval(), SCIP_Lp::looseobjvalinf, SCIP_Stat::lpcount, SCIP_Lp::lpi, SCIP_Col::lpipos, SCIP_Col::lppos, SCIP_Lp::lpsolstat, SCIP_Lp::ncols, SCIP_Stat::nduallpiterations, SCIP_Stat::nduallps, SCIP_Stat::ndualresolvelpiterations, SCIP_Stat::ndualresolvelps, SCIP_Stat::nlps, SCIP_Stat::nnodes, SCIP_Stat::nprimallpiterations, SCIP_Stat::nprimallps, SCIP_Stat::nprimalresolvelpiterations, SCIP_Stat::nprimalresolvelps, SCIP_Col::nsbcalls, NULL, SCIP_Col::primsol, SCIP_Col::sbdown, SCIP_Col::sbdownvalid, SCIP_Col::sbitlim, SCIP_Col::sblpobjval, SCIP_Col::sbnode, SCIP_Col::sbsolval, SCIP_Col::sbup, SCIP_Col::sbupvalid, SCIP_Bool, SCIP_CALL, SCIP_INVALID, SCIP_LPERROR, SCIP_LPSOLSTAT_OPTIMAL, SCIP_OKAY, SCIP_Real, SCIP_VARSTATUS_COLUMN, SCIPclockStart(), SCIPclockStop(), SCIPcolIsIntegral(), SCIPlpGetObjval(), SCIPlpiStrongbranchesFrac(), SCIPlpiStrongbranchesInt(), SCIPsetAllocBufferArray, SCIPsetDebugMsg, SCIPsetFreeBufferArray, SCIPsetInfinity(), SCIPsetIsFeasIntegral(), SCIPstatAdd, SCIPvarGetCol(), SCIPvarGetStatus(), SCIPvarIsIntegral(), SCIP_Lp::solved, SCIP_Stat::strongbranchtime, TRUE, SCIP_Col::validsblp, SCIP_Lp::validsollp, and SCIP_Col::var.

Referenced by SCIPgetVarsStrongbranchesFrac(), and SCIPgetVarsStrongbranchesInt().

SCIPcolGetStrongbranchLast()

void SCIPcolGetStrongbranchLast	(	SCIP_COL *	col,
		SCIP_Real *	down,
		SCIP_Real *	up,
		SCIP_Bool *	downvalid,
		SCIP_Bool *	upvalid,
		SCIP_Real *	solval,
		SCIP_Real *	lpobjval
	)

gets last strong branching information available for a column variable; returns values of SCIP_INVALID, if strong branching was not yet called on the given column; keep in mind, that the returned old values may have nothing to do with the current LP solution

Parameters

col	LP column
down	stores dual bound after branching column down, or NULL
up	stores dual bound after branching column up, or NULL
downvalid	stores whether the returned down value is a valid dual bound, or NULL; otherwise, it can only be used as an estimate value
upvalid	stores whether the returned up value is a valid dual bound, or NULL; otherwise, it can only be used as an estimate value
solval	stores LP solution value of column at last strong branching call, or NULL
lpobjval	stores LP objective value at last strong branching call, or NULL

Definition at line 4696 of file lp.c.

References NULL, SCIP_Col::sbdown, SCIP_Col::sbdownvalid, SCIP_Col::sblpobjval, SCIP_Col::sbsolval, SCIP_Col::sbup, and SCIP_Col::sbupvalid.

Referenced by SCIPgetVarStrongbranchLast().

SCIPcolGetStrongbranchLPAge()

SCIP_Longint SCIPcolGetStrongbranchLPAge	(	SCIP_COL *	col,
		SCIP_STAT *	stat
	)

if strong branching was already applied on the column at the current node, returns the number of LPs solved after the LP where the strong branching on this column was applied; if strong branching was not yet applied on the column at the current node, returns INT_MAX

Parameters

col	LP column
stat	dynamic problem statistics

Definition at line 4728 of file lp.c.

References SCIP_Stat::nlps, SCIP_Stat::nnodes, NULL, SCIP_Col::sbnode, SCIP_LONGINT_MAX, and SCIP_Col::validsblp.

Referenced by SCIPgetVarStrongbranchLPAge().

SCIPcolMarkNotRemovableLocal()

void SCIPcolMarkNotRemovableLocal	(	SCIP_COL *	col,
		SCIP_STAT *	stat
	)

marks a column to be not removable from the LP in the current node because it became obsolete

Parameters

col	LP column
stat	problem statistics

Definition at line 4740 of file lp.c.

References SCIP_Stat::nnodes, NULL, and SCIP_Col::obsoletenode.

Referenced by SCIPmarkColNotRemovableLocal().

rowCalcNorms()

static void rowCalcNorms ( SCIP_ROW *  row, SCIP_SET *  set  )

static

calculates row norms and min/maxidx from scratch, and checks for sorting

Parameters

row	LP row
set	global SCIP settings

Definition at line 4760 of file lp.c.

References SCIP_Row::cols, SCIP_Row::cols_index, SCIP_Col::index, SCIP_Row::linkpos, SCIP_Row::lpcolssorted, SCIP_Col::lppos, SCIP_Row::maxidx, SCIP_Row::maxval, SCIP_Row::minidx, SCIP_Row::minval, SCIP_Row::nlpcols, SCIP_Row::nonlpcolssorted, NULL, SCIP_Row::nummaxval, SCIP_Row::numminval, SCIP_Row::objprod, rowAddNorms(), SCIPsetInfinity(), SCIPsetIsZero(), SCIP_Row::sqrnorm, SCIP_Row::sumnorm, TRUE, SCIP_Row::validminmaxidx, and SCIP_Row::vals.

Referenced by rowMerge(), SCIPlpAddRow(), and SCIProwCreate().

rowCalcIdxsAndVals()

static void rowCalcIdxsAndVals ( SCIP_ROW *  row, SCIP_SET *  set  )

static

calculates min/maxval and min/maxidx from scratch

Parameters

row	LP row
set	global SCIP settings

Definition at line 4819 of file lp.c.

References SCIP_Row::cols, SCIP_Col::index, SCIP_Row::len, MAX, SCIP_Row::maxidx, SCIP_Row::maxval, SCIP_Row::minidx, SCIP_Row::minval, NULL, SCIP_Row::numintcols, SCIP_Row::nummaxval, SCIP_Row::numminval, REALABS, SCIP_Real, SCIPcolIsIntegral(), SCIPsetInfinity(), SCIPsetIsGE(), SCIPsetIsGT(), SCIPsetIsLE(), SCIPsetIsLT(), SCIPsetIsZero(), TRUE, SCIP_Row::validminmaxidx, and SCIP_Row::vals.

Referenced by SCIProwGetMaxidx(), SCIProwGetMaxval(), SCIProwGetMinidx(), SCIProwGetMinval(), and SCIProwGetNumIntCols().

isIntegralScalar()

static SCIP_Bool isIntegralScalar ( SCIP_Real  val, SCIP_Real  scalar, SCIP_Real  mindelta, SCIP_Real  maxdelta, SCIP_Real *  intval  )

static

checks, whether the given scalar scales the given value to an integral number with error in the given bounds

Parameters

val	value that should be scaled to an integral value
scalar	scalar that should be tried
mindelta	minimal relative allowed difference of scaled coefficient s*c and integral i
maxdelta	maximal relative allowed difference of scaled coefficient s*c and integral i
intval	pointer to store the scaled integral value, or NULL

Definition at line 4889 of file lp.c.

References FALSE, NULL, SCIP_Real, SCIPrelDiff(), and TRUE.

Referenced by buildFlowCover(), rowScale(), and SCIProwCalcIntegralScalar().

rowScale()

static SCIP_RETCODE rowScale ( SCIP_ROW *  row, BMS_BLKMEM *  blkmem, SCIP_SET *  set, SCIP_EVENTQUEUE *  eventqueue, SCIP_STAT *  stat, SCIP_LP *  lp, SCIP_Real  scaleval, SCIP_Bool  integralcontvars, SCIP_Real  minrounddelta, SCIP_Real  maxrounddelta  )

static

scales row with given factor, and rounds coefficients to integers if close enough; the constant is automatically moved to the sides; if the row's activity is proven to be integral, the sides are automatically rounded to the next integer

Parameters

row	LP row
blkmem	block memory
set	global SCIP settings
eventqueue	event queue
stat	problem statistics
lp	current LP data
scaleval	value to scale row with
integralcontvars	should the coefficients of the continuous variables also be made integral, if they are close to integral values?
minrounddelta	minimal relative difference of scaled coefficient s*c and integral i, upto which the integral is used instead of the scaled real coefficient
maxrounddelta	maximal relative difference of scaled coefficient s*c and integral i upto which the integral is used instead of the scaled real coefficient

Definition at line 4929 of file lp.c.

References colChgCoefPos(), SCIP_Row::cols, SCIP_Row::constant, debugRowPrint, FALSE, SCIP_Row::integral, isIntegralScalar(), SCIP_Col::lb, SCIP_Row::len, SCIP_Row::lhs, SCIP_Row::linkpos, SCIP_Row::local, SCIP_Row::modifiable, SCIP_Row::name, NULL, SCIP_Row::rhs, rowChgCoefPos(), SCIP_Col::rows, SCIP_Bool, SCIP_CALL, SCIP_OKAY, SCIP_Real, SCIPcolIsIntegral(), SCIProwChgConstant(), SCIProwChgLhs(), SCIProwChgRhs(), SCIPsetDebugMsg, SCIPsetInfinity(), SCIPsetIsEQ(), SCIPsetIsInfinity(), SCIPsetIsIntegral(), SCIPsetIsPositive(), SCIPsetIsZero(), SCIPsetSumCeil(), SCIPsetSumFloor(), SCIPvarGetLbGlobal(), SCIPvarGetUbGlobal(), TRUE, SCIP_Col::ub, SCIP_Row::validactivitylp, SCIP_Col::vals, SCIP_Row::vals, and SCIP_Col::var.

Referenced by SCIProwMakeIntegral().

SCIProwCreate()

SCIP_RETCODE SCIProwCreate	(	SCIP_ROW **	row,
		BMS_BLKMEM *	blkmem,
		SCIP_SET *	set,
		SCIP_STAT *	stat,
		const char *	name,
		int	len,
		SCIP_COL **	cols,
		SCIP_Real *	vals,
		SCIP_Real	lhs,
		SCIP_Real	rhs,
		SCIP_ROWORIGINTYPE	origintype,
		void *	origin,
		SCIP_Bool	local,
		SCIP_Bool	modifiable,
		SCIP_Bool	removable
	)

creates and captures an LP row

Parameters

row	pointer to LP row data
blkmem	block memory
set	global SCIP settings
stat	problem statistics
name	name of row
len	number of nonzeros in the row
cols	array with columns of row entries
vals	array with coefficients of row entries
lhs	left hand side of row
rhs	right hand side of row
origintype	type of origin of row
origin	pointer to constraint handler or separator who created the row (NULL if unkown)
local	is row only valid locally?
modifiable	is row modifiable during node processing (subject to column generation)?
removable	should the row be removed from the LP due to aging or cleanup?

Definition at line 5099 of file lp.c.

References BMSallocBlockMemory, BMSallocBlockMemoryArray, BMSduplicateBlockMemoryArray, FALSE, SCIP_Col::index, SCIP_Stat::nrowidx, NULL, rowCalcNorms(), SCIP_ALLOC, SCIP_BASESTAT_BASIC, SCIP_CALL, SCIP_INVALID, SCIP_OKAY, SCIP_ROWORIGINTYPE_CONS, SCIPconsCapture(), SCIPeventfilterCreate(), SCIProwCapture(), SCIPsetInfinity(), SCIPsetIsIntegral(), SCIPsetIsZero(), SCIPsetRound(), SCIPstatIncrement, SCIPvarIsIntegral(), TRUE, and SCIP_Col::var.

Referenced by SCIPcreateEmptyRowCons(), SCIPcreateEmptyRowConshdlr(), SCIPcreateEmptyRowSepa(), SCIPcreateEmptyRowUnspec(), SCIPcreateRowCons(), SCIPcreateRowConshdlr(), SCIPcreateRowSepa(), SCIPcreateRowUnspec(), and SCIPreoptApplyCuts().

SCIProwFree()

SCIP_RETCODE SCIProwFree	(	SCIP_ROW **	row,
		BMS_BLKMEM *	blkmem,
		SCIP_SET *	set,
		SCIP_LP *	lp
	)

frees an LP row

Parameters

row	pointer to LP row
blkmem	block memory
set	global SCIP settings
lp	current LP data

Definition at line 5247 of file lp.c.

References BMSfreeBlockMemory, BMSfreeBlockMemoryArray, BMSfreeBlockMemoryArrayNull, BMSfreeBlockMemoryNull, NULL, rowUnlink(), SCIP_CALL, SCIP_OKAY, SCIP_ROWORIGINTYPE_CONS, SCIPconsRelease(), and SCIPeventfilterFree().

Referenced by SCIProwRelease().

SCIProwPrint()

void SCIProwPrint	(	SCIP_ROW *	row,
		SCIP_MESSAGEHDLR *	messagehdlr,
		FILE *	file
	)

output row to file stream

Parameters

row	LP row
messagehdlr	message handler
file	output file (or NULL for standard output)

Definition at line 5287 of file lp.c.

References SCIP_Row::cols, SCIP_Row::constant, SCIP_Row::len, SCIP_Row::lhs, SCIP_Row::name, NULL, REALABS, SCIP_Row::rhs, SCIP_DEFAULT_EPSILON, SCIP_VARSTATUS_COLUMN, SCIPmessageFPrintInfo(), SCIPvarGetName(), SCIPvarGetStatus(), SCIP_Row::vals, and SCIP_Col::var.

Referenced by SCIPprintRow().

SCIProwCapture()

void SCIProwCapture

(

SCIP_ROW *

row

)

increases usage counter of LP row

Parameters

row

LP row

Definition at line 5327 of file lp.c.

References SCIP_Row::name, SCIP_Row::nlocks, NULL, SCIP_Row::nuses, and SCIPdebugMessage.

Referenced by cutCreate(), forkCreate(), forkFree(), lpFlushAddRows(), pseudoforkCreate(), SCIPcaptureRow(), SCIPlpAddRow(), SCIProwCreate(), and SCIPsepastoreAddCut().

SCIProwRelease()

SCIP_RETCODE SCIProwRelease	(	SCIP_ROW **	row,
		BMS_BLKMEM *	blkmem,
		SCIP_SET *	set,
		SCIP_LP *	lp
	)

decreases usage counter of LP row, and frees memory if necessary

Parameters

row	pointer to LP row
blkmem	block memory
set	global SCIP settings
lp	current LP data

Definition at line 5340 of file lp.c.

References NULL, SCIP_CALL, SCIP_OKAY, SCIProwFree(), and SCIPsetDebugMsg.

Referenced by cutFree(), forkFree(), lpDelRowset(), lpFlushDelRows(), pseudoforkFree(), SCIPlpFree(), SCIPlpShrinkRows(), SCIPreleaseRow(), SCIPreoptApplyCuts(), SCIPsepastoreAddCut(), SCIPsepastoreClearCuts(), sepastoreDelCut(), and subrootFree().

SCIProwAddCoef()

SCIP_RETCODE SCIProwAddCoef	(	SCIP_ROW *	row,
		BMS_BLKMEM *	blkmem,
		SCIP_SET *	set,
		SCIP_EVENTQUEUE *	eventqueue,
		SCIP_LP *	lp,
		SCIP_COL *	col,
		SCIP_Real	val
	)

adds a previously non existing coefficient to an LP row

Parameters

row	LP row
blkmem	block memory
set	global SCIP settings
eventqueue	event queue
lp	current LP data
col	LP column
val	value of coefficient

Definition at line 5397 of file lp.c.

References checkLinks, SCIP_Lp::diving, SCIP_Row::lppos, NULL, rowAddCoef(), SCIP_CALL, and SCIP_OKAY.

SCIProwDelCoef()

SCIP_RETCODE SCIProwDelCoef	(	SCIP_ROW *	row,
		BMS_BLKMEM *	blkmem,
		SCIP_SET *	set,
		SCIP_EVENTQUEUE *	eventqueue,
		SCIP_LP *	lp,
		SCIP_COL *	col
	)

deletes coefficient from row

Parameters

row	row to be changed
blkmem	block memory
set	global SCIP settings
eventqueue	event queue
lp	current LP data
col	coefficient to be deleted

Definition at line 5418 of file lp.c.

References checkLinks, colDelCoefPos(), SCIP_Row::cols, SCIP_Row::cols_index, SCIP_Row::delaysort, SCIP_Lp::diving, SCIP_Col::index, SCIP_Row::linkpos, SCIP_Row::lppos, SCIP_Row::name, NULL, rowDelCoefPos(), SCIP_Col::rows, rowSearchCoef(), SCIP_CALL, SCIP_INVALIDDATA, SCIP_OKAY, SCIPerrorMessage, SCIPsetIsEQ(), SCIPvarGetName(), SCIP_Col::vals, SCIP_Row::vals, and SCIP_Col::var.

SCIProwChgCoef()

SCIP_RETCODE SCIProwChgCoef	(	SCIP_ROW *	row,
		BMS_BLKMEM *	blkmem,
		SCIP_SET *	set,
		SCIP_EVENTQUEUE *	eventqueue,
		SCIP_LP *	lp,
		SCIP_COL *	col,
		SCIP_Real	val
	)

changes or adds a coefficient to an LP row

Parameters

row	LP row
blkmem	block memory
set	global SCIP settings
eventqueue	event queue
lp	current LP data
col	LP column
val	value of coefficient

Definition at line 5464 of file lp.c.

References checkLinks, colChgCoefPos(), SCIP_Row::cols, SCIP_Row::cols_index, SCIP_Row::delaysort, SCIP_Lp::diving, SCIP_Col::index, SCIP_Row::linkpos, SCIP_Row::lppos, NULL, rowAddCoef(), rowChgCoefPos(), SCIP_Col::rows, rowSearchCoef(), SCIP_CALL, SCIP_OKAY, SCIPsetIsEQ(), SCIP_Col::vals, and SCIP_Row::vals.

SCIProwIncCoef()

SCIP_RETCODE SCIProwIncCoef	(	SCIP_ROW *	row,
		BMS_BLKMEM *	blkmem,
		SCIP_SET *	set,
		SCIP_EVENTQUEUE *	eventqueue,
		SCIP_LP *	lp,
		SCIP_COL *	col,
		SCIP_Real	incval
	)

increases value of an existing or non-existing coefficient in an LP row

Parameters

row	LP row
blkmem	block memory
set	global SCIP settings
eventqueue	event queue
lp	current LP data
col	LP column
incval	value to add to the coefficient

Definition at line 5516 of file lp.c.

References checkLinks, colChgCoefPos(), SCIP_Row::cols, SCIP_Row::cols_index, SCIP_Lp::diving, SCIP_Col::index, SCIP_Row::linkpos, SCIP_Row::lppos, NULL, rowAddCoef(), rowChgCoefPos(), SCIP_Col::rows, rowSearchCoef(), SCIP_CALL, SCIP_OKAY, SCIPsetIsEQ(), SCIPsetIsZero(), SCIP_Row::validactivitylp, SCIP_Col::vals, and SCIP_Row::vals.

Referenced by SCIPvarAddToRow().

SCIProwChgConstant()

SCIP_RETCODE SCIProwChgConstant	(	SCIP_ROW *	row,
		BMS_BLKMEM *	blkmem,
		SCIP_SET *	set,
		SCIP_STAT *	stat,
		SCIP_EVENTQUEUE *	eventqueue,
		SCIP_LP *	lp,
		SCIP_Real	constant
	)

changes constant value of a row

Parameters

row	LP row
blkmem	block memory
set	global SCIP settings
stat	problem statistics
eventqueue	event queue
lp	current LP data
constant	new constant value

Definition at line 5573 of file lp.c.

References SCIP_Row::constant, SCIP_Lp::diving, SCIP_Stat::domchgcount, SCIP_Row::lhs, SCIP_Row::lppos, SCIP_Row::maxactivity, SCIP_Row::minactivity, NULL, SCIP_Row::pseudoactivity, REALABS, SCIP_Row::rhs, rowEventConstantChanged(), rowSideChanged(), SCIP_CALL, SCIP_INVALID, SCIP_OKAY, SCIP_Real, SCIP_SIDETYPE_LEFT, SCIP_SIDETYPE_RIGHT, SCIPsetIsEQ(), SCIPsetIsInfinity(), SCIP_Row::validactivitybdsdomchg, and SCIP_Row::validpsactivitydomchg.

Referenced by rowScale(), and SCIProwAddConstant().

SCIProwAddConstant()

SCIP_RETCODE SCIProwAddConstant	(	SCIP_ROW *	row,
		BMS_BLKMEM *	blkmem,
		SCIP_SET *	set,
		SCIP_STAT *	stat,
		SCIP_EVENTQUEUE *	eventqueue,
		SCIP_LP *	lp,
		SCIP_Real	addval
	)

add constant value to a row

Parameters

row	LP row
blkmem	block memory
set	global SCIP settings
stat	problem statistics
eventqueue	event queue
lp	current LP data
addval	constant value to add to the row

Definition at line 5628 of file lp.c.

References SCIP_Row::constant, SCIP_Lp::diving, SCIP_Row::lhs, SCIP_Row::lppos, NULL, REALABS, SCIP_Row::rhs, SCIP_CALL, SCIP_OKAY, SCIProwChgConstant(), SCIPsetIsInfinity(), and SCIPsetIsZero().

Referenced by SCIPvarAddToRow().

SCIProwChgLhs()

SCIP_RETCODE SCIProwChgLhs	(	SCIP_ROW *	row,
		BMS_BLKMEM *	blkmem,
		SCIP_SET *	set,
		SCIP_EVENTQUEUE *	eventqueue,
		SCIP_LP *	lp,
		SCIP_Real	lhs
	)

changes left hand side of LP row

Parameters

row	LP row
blkmem	block memory
set	global SCIP settings
eventqueue	event queue
lp	current LP data
lhs	new left hand side

Definition at line 5654 of file lp.c.

References SCIP_Lp::diving, SCIP_Row::lhs, NULL, rowEventSideChanged(), rowSideChanged(), SCIP_CALL, SCIP_OKAY, SCIP_Real, SCIP_SIDETYPE_LEFT, and SCIPsetIsEQ().

Referenced by rowScale(), SCIPchgRowLhs(), SCIPchgRowLhsDive(), and SCIPlpEndDive().

SCIProwChgRhs()

SCIP_RETCODE SCIProwChgRhs	(	SCIP_ROW *	row,
		BMS_BLKMEM *	blkmem,
		SCIP_SET *	set,
		SCIP_EVENTQUEUE *	eventqueue,
		SCIP_LP *	lp,
		SCIP_Real	rhs
	)

changes right hand side of LP row

Parameters

row	LP row
blkmem	block memory
set	global SCIP settings
eventqueue	event queue
lp	current LP data
rhs	new right hand side

Definition at line 5686 of file lp.c.

References SCIP_Lp::diving, NULL, SCIP_Row::rhs, rowEventSideChanged(), rowSideChanged(), SCIP_CALL, SCIP_OKAY, SCIP_Real, SCIP_SIDETYPE_RIGHT, and SCIPsetIsEQ().

Referenced by rowScale(), SCIPchgRowRhs(), SCIPchgRowRhsDive(), and SCIPlpEndDive().

SCIProwChgLocal()

SCIP_RETCODE SCIProwChgLocal	(	SCIP_ROW *	row,
		SCIP_Bool	local
	)

changes the local flag of LP row

Parameters

row	LP row
local	new value for local flag

Definition at line 5718 of file lp.c.

References SCIP_Row::local, NULL, and SCIP_OKAY.

Referenced by SCIPsepastoreAddCut().

SCIProwCalcIntegralScalar()

SCIP_RETCODE SCIProwCalcIntegralScalar	(	SCIP_ROW *	row,
		SCIP_SET *	set,
		SCIP_Real	mindelta,
		SCIP_Real	maxdelta,
		SCIP_Longint	maxdnom,
		SCIP_Real	maxscale,
		SCIP_Bool	usecontvars,
		SCIP_Real *	intscalar,
		SCIP_Bool *	success
	)

tries to find a value, such that all row coefficients, if scaled with this value become integral

Parameters

row	LP row
set	global SCIP settings
mindelta	minimal relative allowed difference of scaled coefficient s*c and integral i
maxdelta	maximal relative allowed difference of scaled coefficient s*c and integral i
maxdnom	maximal denominator allowed in rational numbers
maxscale	maximal allowed scalar
usecontvars	should the coefficients of the continuous variables also be made integral?
intscalar	pointer to store scalar that would make the coefficients integral, or NULL
success	stores whether returned value is valid

Definition at line 5735 of file lp.c.

References SCIP_Row::cols, SCIP_Row::cols_index, FALSE, isIntegralScalar(), SCIP_Row::len, nscalars, NULL, REALABS, SCIP_Bool, SCIP_INVALID, SCIP_Longint, SCIP_OKAY, SCIP_Real, SCIP_REAL_MAX, SCIP_VARSTATUS_COLUMN, SCIPcalcGreComDiv(), SCIPcolIsIntegral(), SCIPdebug, SCIPrealToRational(), SCIProwGetName(), SCIPsetDebugMsg, SCIPsetIsInfinity(), SCIPsetIsPositive(), SCIPsetIsZero(), SCIPvarGetCol(), SCIPvarGetStatus(), TRUE, SCIP_Row::vals, and SCIP_Col::var.

Referenced by SCIPcalcRowIntegralScalar(), and SCIProwMakeIntegral().

SCIProwMakeIntegral()

SCIP_RETCODE SCIProwMakeIntegral	(	SCIP_ROW *	row,
		BMS_BLKMEM *	blkmem,
		SCIP_SET *	set,
		SCIP_EVENTQUEUE *	eventqueue,
		SCIP_STAT *	stat,
		SCIP_LP *	lp,
		SCIP_Real	mindelta,
		SCIP_Real	maxdelta,
		SCIP_Longint	maxdnom,
		SCIP_Real	maxscale,
		SCIP_Bool	usecontvars,
		SCIP_Bool *	success
	)

tries to scale row, s.t. all coefficients become integral

Parameters

row	LP row
blkmem	block memory
set	global SCIP settings
eventqueue	event queue
stat	problem statistics
lp	current LP data
mindelta	minimal relative allowed difference of scaled coefficient s*c and integral i
maxdelta	maximal relative allowed difference of scaled coefficient s*c and integral i
maxdnom	maximal denominator allowed in rational numbers
maxscale	maximal value to scale row with
usecontvars	should the coefficients of the continuous variables also be made integral?
success	stores whether row could be made rational

Definition at line 5969 of file lp.c.

References NULL, rowScale(), SCIP_CALL, SCIP_OKAY, SCIP_Real, and SCIProwCalcIntegralScalar().

Referenced by SCIPmakeRowIntegral().

rowMerge()

static void rowMerge ( SCIP_ROW *  row, SCIP_SET *  set  )

static

sorts row, and merges equal column entries (resulting from lazy sorting and adding) into a single entry; removes zero entries from row the row must not be linked to the columns; otherwise, we would need to update the columns as well, which is too expensive

Parameters

row	row to be sorted
set	global SCIP settings

Definition at line 6037 of file lp.c.

References SCIP_Row::cols, SCIP_Row::cols_index, SCIP_Row::delaysort, SCIP_Col::index, SCIP_Row::integral, SCIP_Row::len, SCIP_Row::linkpos, SCIP_Row::lpcolssorted, SCIP_Row::name, SCIP_Row::nlpcols, SCIP_Row::nonlpcolssorted, NULL, SCIP_Row::nunlinked, rowCalcNorms(), SCIP_Real, SCIPcolIsIntegral(), SCIProwSort(), SCIPsetDebugMsg, SCIPsetIsIntegral(), SCIPsetIsZero(), SCIPsetRound(), TRUE, and SCIP_Row::vals.

Referenced by SCIProwForceSort().

SCIProwDelaySort()

void SCIProwDelaySort

(

SCIP_ROW *

row

)

enables delaying of row sorting

Parameters

row

LP row

Definition at line 6136 of file lp.c.

References SCIP_Row::delaysort, NULL, and TRUE.

Referenced by SCIPaddVarsToRow(), SCIPaddVarsToRowSameCoef(), and SCIPcacheRowExtensions().

SCIProwForceSort()

void SCIProwForceSort	(	SCIP_ROW *	row,
		SCIP_SET *	set
	)

disables delaying of row sorting, sorts row and merges coefficients with equal columns

Parameters

row	LP row
set	global SCIP settings

Definition at line 6147 of file lp.c.

References SCIP_Row::delaysort, FALSE, NULL, and rowMerge().

Referenced by SCIPaddVarsToRow(), SCIPaddVarsToRowSameCoef(), and SCIPflushRowExtensions().

SCIProwRecalcLPActivity()

void SCIProwRecalcLPActivity	(	SCIP_ROW *	row,
		SCIP_STAT *	stat
	)

recalculates the current activity of a row

Parameters

row	LP row
stat	problem statistics

Definition at line 6160 of file lp.c.

References SCIP_Row::activity, SCIP_Row::cols, SCIP_Row::constant, SCIP_Row::linkpos, SCIP_Stat::lpcount, SCIP_Col::lppos, SCIP_Row::nlpcols, NULL, SCIP_Row::nunlinked, SCIP_Col::primsol, SCIP_INVALID, SCIP_Row::validactivitylp, and SCIP_Row::vals.

Referenced by SCIPrecalcRowActivity(), SCIPrecalcRowLPActivity(), and SCIProwGetLPActivity().

SCIProwGetLPActivity()

SCIP_Real SCIProwGetLPActivity	(	SCIP_ROW *	row,
		SCIP_SET *	set,
		SCIP_STAT *	stat,
		SCIP_LP *	lp
	)

returns the activity of a row in the current LP solution

Parameters

row	LP row
set	global SCIP settings
stat	problem statistics
lp	current LP data

Definition at line 6212 of file lp.c.

References SCIP_Row::activity, SCIP_Interval::inf, SCIP_Stat::lpcount, MAX, NULL, SCIP_INVALID, SCIP_Real, SCIProwRecalcLPActivity(), SCIPsetInfinity(), SCIP_Row::validactivitylp, and SCIP_Lp::validsollp.

Referenced by SCIPgetRowActivity(), SCIPgetRowLPActivity(), SCIPgetRowSolActivity(), SCIPlpGetDegeneracy(), and SCIProwGetLPFeasibility().

SCIProwGetLPFeasibility()

SCIP_Real SCIProwGetLPFeasibility	(	SCIP_ROW *	row,
		SCIP_SET *	set,
		SCIP_STAT *	stat,
		SCIP_LP *	lp
	)

returns the feasibility of a row in the current LP solution: negative value means infeasibility

Parameters

row	LP row
set	global SCIP settings
stat	problem statistics
lp	current LP data

Definition at line 6242 of file lp.c.

References SCIP_Row::lhs, NULL, SCIP_Row::rhs, SCIP_Real, and SCIProwGetLPActivity().

Referenced by SCIPcutpoolSeparate(), SCIPgetRowFeasibility(), SCIPgetRowLPFeasibility(), SCIPgetRowSolFeasibility(), SCIProwGetLPEfficacy(), and SCIProwGetLPSolCutoffDistance().

SCIProwGetRelaxFeasibility()

SCIP_Real SCIProwGetRelaxFeasibility	(	SCIP_ROW *	row,
		SCIP_SET *	set,
		SCIP_STAT *	stat
	)

returns the feasibility of a row in the relaxed solution solution: negative value means infeasibility

Parameters

row	LP row
set	global SCIP settings
stat	problem statistics

Definition at line 6262 of file lp.c.

References SCIP_Row::cols, SCIP_Row::constant, SCIP_Interval::inf, SCIP_Row::lhs, SCIP_Row::linkpos, SCIP_Col::lppos, MAX, SCIP_Row::nlpcols, NULL, SCIP_Row::nunlinked, SCIP_Row::rhs, SCIP_Real, SCIPsetInfinity(), SCIPvarGetRelaxSol(), SCIP_Row::vals, and SCIP_Col::var.

Referenced by SCIProwGetRelaxEfficacy().

SCIProwGetNLPFeasibility()

SCIP_Real SCIProwGetNLPFeasibility	(	SCIP_ROW *	row,
		SCIP_SET *	set,
		SCIP_STAT *	stat
	)

returns the feasibility of a row in the current NLP solution: negative value means infeasibility

Parameters

row	LP row
set	global SCIP settings
stat	problem statistics

Definition at line 6324 of file lp.c.

References SCIP_Row::cols, SCIP_Row::constant, SCIP_Interval::inf, SCIP_Row::lhs, SCIP_Row::linkpos, SCIP_Col::lppos, MAX, SCIP_Row::nlpcols, NULL, SCIP_Row::nunlinked, SCIP_Row::rhs, SCIP_Real, SCIPsetInfinity(), SCIPvarGetNLPSol(), SCIP_Row::vals, and SCIP_Col::var.

Referenced by SCIProwGetNLPEfficacy().

SCIProwRecalcPseudoActivity()

void SCIProwRecalcPseudoActivity	(	SCIP_ROW *	row,
		SCIP_STAT *	stat
	)

calculates the current pseudo activity of a row

Parameters

row	row data
stat	problem statistics

Definition at line 6383 of file lp.c.

References SCIP_Row::cols, SCIP_Row::constant, SCIP_Stat::domchgcount, EPSISINT, SCIP_Row::integral, SCIP_Row::len, SCIP_Row::linkpos, SCIP_Col::lppos, NULL, SCIP_Row::pseudoactivity, SCIP_DEFAULT_SUMEPSILON, SCIP_VARSTATUS_COLUMN, SCIPcolGetBestBound(), SCIPvarGetStatus(), SCIP_Row::validpsactivitydomchg, SCIP_Row::vals, and SCIP_Col::var.

Referenced by SCIPrecalcRowActivity(), SCIPrecalcRowPseudoActivity(), and SCIProwGetPseudoActivity().

SCIProwGetPseudoActivity()

SCIP_Real SCIProwGetPseudoActivity	(	SCIP_ROW *	row,
		SCIP_SET *	set,
		SCIP_STAT *	stat
	)

returns the pseudo activity of a row in the current pseudo solution

Parameters

row	LP row
set	global SCIP settings
stat	problem statistics

Definition at line 6410 of file lp.c.

References SCIP_Stat::domchgcount, SCIP_Interval::inf, MAX, NULL, SCIP_Row::pseudoactivity, SCIP_INVALID, SCIP_Real, SCIProwRecalcPseudoActivity(), SCIPsetInfinity(), and SCIP_Row::validpsactivitydomchg.

Referenced by SCIPgetRowActivity(), SCIPgetRowPseudoActivity(), SCIPgetRowSolActivity(), and SCIProwGetPseudoFeasibility().

SCIProwGetPseudoFeasibility()

SCIP_Real SCIProwGetPseudoFeasibility	(	SCIP_ROW *	row,
		SCIP_SET *	set,
		SCIP_STAT *	stat
	)

returns the pseudo feasibility of a row in the current pseudo solution: negative value means infeasibility

Parameters

row	LP row
set	global SCIP settings
stat	problem statistics

Definition at line 6438 of file lp.c.

References SCIP_Row::lhs, NULL, SCIP_Row::rhs, SCIP_Real, and SCIProwGetPseudoActivity().

Referenced by SCIPgetRowFeasibility(), SCIPgetRowPseudoFeasibility(), and SCIPgetRowSolFeasibility().

SCIProwGetSolActivity()

SCIP_Real SCIProwGetSolActivity	(	SCIP_ROW *	row,
		SCIP_SET *	set,
		SCIP_STAT *	stat,
		SCIP_SOL *	sol
	)

returns the activity of a row for a given solution

Parameters

row	LP row
set	global SCIP settings
stat	problem statistics data
sol	primal CIP solution

Definition at line 6454 of file lp.c.

References SCIP_Row::cols, SCIP_Row::constant, SCIP_Interval::inf, SCIP_Col::lb, SCIP_Row::len, SCIP_Row::lhs, SCIP_Row::linkpos, SCIP_Col::lppos, MAX, NULL, SCIP_Row::rhs, SCIP_Real, SCIP_UNKNOWN, SCIPsetInfinity(), SCIPsetIsInfinity(), SCIPsolGetVal(), SCIP_Col::ub, SCIP_Row::vals, and SCIP_Col::var.

Referenced by SCIPgetRowSolActivity(), SCIProwGetSolFeasibility(), and SCIPsolAdjustImplicitSolVals().

SCIProwGetSolFeasibility()

SCIP_Real SCIProwGetSolFeasibility	(	SCIP_ROW *	row,
		SCIP_SET *	set,
		SCIP_STAT *	stat,
		SCIP_SOL *	sol
	)

returns the feasibility of a row for the given solution

Parameters

row	LP row
set	global SCIP settings
stat	problem statistics data
sol	primal CIP solution

Definition at line 6496 of file lp.c.

References SCIP_Row::lhs, NULL, SCIP_Row::rhs, SCIP_Real, and SCIProwGetSolActivity().

Referenced by SCIPcutpoolSeparate(), SCIPgetRowSolFeasibility(), and SCIProwGetSolEfficacy().

rowCalcActivityBounds()

static void rowCalcActivityBounds ( SCIP_ROW *  row, SCIP_SET *  set, SCIP_STAT *  stat  )

static

calculates minimal and maximal activity of row w.r.t. the column's bounds

Parameters

row	row data
set	global SCIP settings
stat	problem statistics data

Definition at line 6514 of file lp.c.

References SCIP_Row::cols, SCIP_Row::constant, SCIP_Stat::domchgcount, EPSISINT, FALSE, SCIP_Row::integral, SCIP_Col::lb, SCIP_Row::len, SCIP_Row::linkpos, SCIP_Col::lppos, SCIP_Row::maxactivity, SCIP_Row::minactivity, NULL, REALABS, SCIP_Bool, SCIP_Real, SCIPsetFeastol(), SCIPsetInfinity(), SCIPsetIsInfinity(), SCIPsetSumepsilon(), SCIP_Col::ub, SCIP_Row::validactivitybdsdomchg, and SCIP_Row::vals.

Referenced by SCIProwGetMaxActivity(), and SCIProwGetMinActivity().

SCIProwGetMinActivity()

SCIP_Real SCIProwGetMinActivity	(	SCIP_ROW *	row,
		SCIP_SET *	set,
		SCIP_STAT *	stat
	)

returns the minimal activity of a row w.r.t. the columns' bounds

Parameters

row	LP row
set	global SCIP settings
stat	problem statistics data

Definition at line 6586 of file lp.c.

References SCIP_Stat::domchgcount, SCIP_Row::maxactivity, SCIP_Row::minactivity, NULL, rowCalcActivityBounds(), SCIP_INVALID, and SCIP_Row::validactivitybdsdomchg.

Referenced by SCIPaddRow(), SCIPgetRowMinActivity(), SCIPlpGetDegeneracy(), SCIPlpRemoveRedundantRows(), SCIProwIsRedundant(), sepastoreIsCutRedundant(), and sepastoreIsCutRedundantOrInfeasible().

SCIProwGetMaxActivity()

SCIP_Real SCIProwGetMaxActivity	(	SCIP_ROW *	row,
		SCIP_SET *	set,
		SCIP_STAT *	stat
	)

returns the maximal activity of a row w.r.t. the columns' bounds

Parameters

row	LP row
set	global SCIP settings
stat	problem statistics data

Definition at line 6607 of file lp.c.

References SCIP_Stat::domchgcount, SCIP_Row::maxactivity, SCIP_Row::minactivity, NULL, rowCalcActivityBounds(), SCIP_INVALID, and SCIP_Row::validactivitybdsdomchg.

Referenced by SCIPaddRow(), SCIPgetRowMaxActivity(), SCIPlpGetDegeneracy(), SCIPlpRemoveRedundantRows(), SCIProwIsRedundant(), sepastoreIsCutRedundant(), and sepastoreIsCutRedundantOrInfeasible().

SCIProwIsRedundant()

SCIP_Bool SCIProwIsRedundant	(	SCIP_ROW *	row,
		SCIP_SET *	set,
		SCIP_STAT *	stat
	)

returns whether the row is unmodifiable and redundant w.r.t. the columns' bounds

Parameters

row	LP row
set	global SCIP settings
stat	problem statistics data

Definition at line 6628 of file lp.c.

References FALSE, SCIP_Row::lhs, SCIP_Row::modifiable, NULL, SCIP_Row::rhs, SCIP_Real, SCIProwGetMaxActivity(), SCIProwGetMinActivity(), SCIPsetIsFeasGT(), SCIPsetIsFeasLT(), SCIPsetIsInfinity(), and TRUE.

Referenced by SCIPlpRemoveRedundantRows().

SCIProwGetMaxval()

SCIP_Real SCIProwGetMaxval	(	SCIP_ROW *	row,
		SCIP_SET *	set
	)

gets maximal absolute value of row vector coefficients

Parameters

row	LP row
set	global SCIP settings

Definition at line 6659 of file lp.c.

References SCIP_Row::len, SCIP_Row::maxval, NULL, SCIP_Row::nummaxval, and rowCalcIdxsAndVals().

Referenced by SCIP_DECL_HASHKEYEQ(), SCIP_DECL_HASHKEYVAL(), SCIPcutpoolAddRow(), SCIPcutpoolIsCutNew(), SCIPgetRowMaxCoef(), SCIProwGetLPEfficacy(), SCIProwGetNLPEfficacy(), SCIProwGetRelaxEfficacy(), and SCIProwGetSolEfficacy().

SCIProwGetMinval()

SCIP_Real SCIProwGetMinval	(	SCIP_ROW *	row,
		SCIP_SET *	set
	)

gets minimal absolute value of row vector's non-zero coefficients

Parameters

row	LP row
set	global SCIP settings

Definition at line 6675 of file lp.c.

References SCIP_Row::len, SCIP_Row::minval, NULL, SCIP_Row::numminval, and rowCalcIdxsAndVals().

Referenced by SCIP_DECL_HASHKEYEQ(), and SCIPgetRowMinCoef().

SCIProwGetMaxidx()

int SCIProwGetMaxidx	(	SCIP_ROW *	row,
		SCIP_SET *	set
	)

gets maximal column index of row entries

Parameters

row	LP row
set	global SCIP settings

Definition at line 6691 of file lp.c.

References SCIP_Row::len, SCIP_Row::maxidx, NULL, rowCalcIdxsAndVals(), and SCIP_Row::validminmaxidx.

Referenced by SCIPcutpoolAddNewRow().

SCIProwGetMinidx()

int SCIProwGetMinidx	(	SCIP_ROW *	row,
		SCIP_SET *	set
	)

gets minimal column index of row entries

Parameters

row	LP row
set	global SCIP settings

Definition at line 6707 of file lp.c.

References SCIP_Row::len, SCIP_Row::minidx, NULL, rowCalcIdxsAndVals(), and SCIP_Row::validminmaxidx.

SCIProwGetNumIntCols()

int SCIProwGetNumIntCols	(	SCIP_ROW *	row,
		SCIP_SET *	set
	)

gets number of integral columns in row

Parameters

row	LP row
set	global SCIP settings

Definition at line 6723 of file lp.c.

References SCIP_Row::len, NULL, SCIP_Row::numintcols, and rowCalcIdxsAndVals().

Referenced by SCIPgetRowNumIntCols(), and SCIPselectCuts().

SCIProwGetLPSolCutoffDistance()

SCIP_Real SCIProwGetLPSolCutoffDistance	(	SCIP_ROW *	row,
		SCIP_SET *	set,
		SCIP_STAT *	stat,
		SCIP_SOL *	sol,
		SCIP_LP *	lp
	)

returns row's cutoff distance in the direction of the given primal solution

Parameters

row	LP row
set	global SCIP settings
stat	problem statistics data
sol	solution to compute direction for cutoff distance; must not be NULL
lp	current LP data

Definition at line 6739 of file lp.c.

References SCIP_Row::cols, SCIP_Lp::cols, ensureSoldirectionSize(), SCIP_Stat::lpcount, SCIP_Col::lppos, SCIP_Lp::ncols, SCIP_Row::nlpcols, NULL, SCIP_Col::primsol, SCIP_CALL_ABORT, SCIP_Real, SCIProwGetLPFeasibility(), SCIPsetIsSumZero(), SCIPsolGetVal(), SCIP_Lp::soldirection, SCIP_Lp::validsoldirlp, SCIP_Lp::validsoldirsol, SCIP_Row::vals, and SCIP_Col::var.

Referenced by SCIPselectCuts().

SCIProwGetLPEfficacy()

SCIP_Real SCIProwGetLPEfficacy	(	SCIP_ROW *	row,
		SCIP_SET *	set,
		SCIP_STAT *	stat,
		SCIP_LP *	lp
	)

returns row's efficacy with respect to the current LP solution: e = -feasibility/norm

Parameters

row	LP row
set	global SCIP settings
stat	problem statistics data
lp	current LP data

Definition at line 6796 of file lp.c.

References eps, SCIP_Row::len, MAX, NULL, SCIP_Real, SCIPABORT, SCIPerrorMessage, SCIProwGetLPFeasibility(), SCIProwGetMaxval(), SCIProwGetNorm(), SCIProwGetSumNorm(), and SCIPsetSumepsilon().

Referenced by SCIPcutpoolAddNewRow(), SCIPcutpoolSeparate(), SCIPgetCutEfficacy(), SCIProwIsLPEfficacious(), SCIPselectCuts(), SCIPsepastoreApplyCuts(), and SCIPsepastoreRemoveInefficaciousCuts().

SCIProwIsLPEfficacious()

SCIP_Bool SCIProwIsLPEfficacious	(	SCIP_ROW *	row,
		SCIP_SET *	set,
		SCIP_STAT *	stat,
		SCIP_LP *	lp,
		SCIP_Bool	root
	)

returns whether the row's efficacy with respect to the current LP solution is greater than the minimal cut efficacy

Parameters

row	LP row
set	global SCIP settings
stat	problem statistics data
lp	current LP data
root	should the root's minimal cut efficacy be used?

Definition at line 6837 of file lp.c.

References SCIP_Real, SCIProwGetLPEfficacy(), and SCIPsetIsEfficacious().

Referenced by SCIPisCutEfficacious().

SCIProwGetSolEfficacy()

SCIP_Real SCIProwGetSolEfficacy	(	SCIP_ROW *	row,
		SCIP_SET *	set,
		SCIP_STAT *	stat,
		SCIP_SOL *	sol
	)

returns row's efficacy with respect to the given primal solution: e = -feasibility/norm

Parameters

row	LP row
set	global SCIP settings
stat	problem statistics data
sol	primal CIP solution

Definition at line 6853 of file lp.c.

References eps, SCIP_Row::len, MAX, NULL, SCIP_Real, SCIPABORT, SCIPerrorMessage, SCIProwGetMaxval(), SCIProwGetNorm(), SCIProwGetSolFeasibility(), SCIProwGetSumNorm(), and SCIPsetSumepsilon().

Referenced by SCIPcutpoolSeparate(), SCIPgetCutEfficacy(), and SCIProwIsSolEfficacious().

SCIProwIsSolEfficacious()

SCIP_Bool SCIProwIsSolEfficacious	(	SCIP_ROW *	row,
		SCIP_SET *	set,
		SCIP_STAT *	stat,
		SCIP_SOL *	sol,
		SCIP_Bool	root
	)

returns whether the row's efficacy with respect to the given primal solution is greater than the minimal cut efficacy

Parameters

row	LP row
set	global SCIP settings
stat	problem statistics data
sol	primal CIP solution
root	should the root's minimal cut efficacy be used?

Definition at line 6896 of file lp.c.

References SCIP_Real, SCIProwGetSolEfficacy(), and SCIPsetIsEfficacious().

Referenced by SCIPisCutEfficacious().

SCIProwGetRelaxEfficacy()

SCIP_Real SCIProwGetRelaxEfficacy	(	SCIP_ROW *	row,
		SCIP_SET *	set,
		SCIP_STAT *	stat
	)

returns row's efficacy with respect to the relaxed solution: e = -feasibility/norm

Parameters

row	LP row
set	global SCIP settings
stat	problem statistics data

Definition at line 6912 of file lp.c.

References eps, SCIP_Row::len, MAX, NULL, SCIP_Real, SCIPABORT, SCIPerrorMessage, SCIProwGetMaxval(), SCIProwGetNorm(), SCIProwGetRelaxFeasibility(), SCIProwGetSumNorm(), and SCIPsetSumepsilon().

Referenced by SCIPsepastoreRemoveInefficaciousCuts().

SCIProwGetNLPEfficacy()

SCIP_Real SCIProwGetNLPEfficacy	(	SCIP_ROW *	row,
		SCIP_SET *	set,
		SCIP_STAT *	stat
	)

returns row's efficacy with respect to the NLP solution: e = -feasibility/norm

Parameters

row	LP row
set	global SCIP settings
stat	problem statistics data

Definition at line 6952 of file lp.c.

References eps, SCIP_Row::len, MAX, NULL, SCIP_Real, SCIPABORT, SCIPerrorMessage, SCIProwGetMaxval(), SCIProwGetNLPFeasibility(), SCIProwGetNorm(), SCIProwGetSumNorm(), and SCIPsetSumepsilon().

Referenced by SCIPsepastoreRemoveInefficaciousCuts().

SCIProwGetDiscreteScalarProduct()

static int SCIProwGetDiscreteScalarProduct ( SCIP_ROW *  row1, SCIP_ROW *  row2  )

static

returns the discrete scalar product of the coefficient vectors of the two given rows

Parameters

row1	first LP row
row2	second LP row

Definition at line 7353 of file lp.c.

References SCIP_Row::cols, SCIP_Row::cols_index, FALSE, SCIP_Col::index, SCIP_Row::len, SCIP_Row::lpcolssorted, SCIP_Col::lppos, MAX, SCIP_Row::nlpcols, SCIP_Row::nonlpcolssorted, NULL, SCIP_Row::nunlinked, SCIP_Bool, SCIProwSort(), SCIPswapPointers(), and TRUE.

Referenced by SCIProwGetParallelism().

SCIProwGetObjParallelism()

SCIP_Real SCIProwGetObjParallelism	(	SCIP_ROW *	row,
		SCIP_SET *	set,
		SCIP_LP *	lp
	)

gets parallelism of row with objective function: if the returned value is 1, the row is parallel to the objective function, if the value is 0, it is orthogonal to the objective function

Parameters

row	LP row
set	global SCIP settings
lp	current LP data

Definition at line 7788 of file lp.c.

References checkRowObjprod, checkRowSqrnorm, MAX, NULL, SCIP_Row::objprod, SCIP_Lp::objsqrnorm, SCIP_Lp::objsqrnormunreliable, REALABS, SCIP_Real, SCIPlpRecalculateObjSqrNorm(), SCIPsetIsPositive(), SCIPsetIsSumGE(), SCIPsetIsSumLE(), and SCIP_Row::sqrnorm.

Referenced by SCIPgetRowObjParallelism(), and SCIPselectCuts().

SCIProwCatchEvent()

SCIP_RETCODE SCIProwCatchEvent	(	SCIP_ROW *	row,
		BMS_BLKMEM *	blkmem,
		SCIP_SET *	set,
		SCIP_EVENTTYPE	eventtype,
		SCIP_EVENTHDLR *	eventhdlr,
		SCIP_EVENTDATA *	eventdata,
		int *	filterpos
	)

includes event handler with given data in row's event filter

Parameters

row	row
blkmem	block memory
set	global SCIP settings
eventtype	event type to catch
eventhdlr	event handler to call for the event processing
eventdata	event data to pass to the event handler for the event processing
filterpos	pointer to store position of event filter entry, or NULL

Definition at line 7821 of file lp.c.

References SCIP_Row::eventfilter, SCIP_Row::name, NULL, SCIP_CALL, SCIP_EVENTTYPE_FORMAT, SCIP_EVENTTYPE_ROWCHANGED, SCIP_OKAY, SCIPeventfilterAdd(), and SCIPsetDebugMsg.

Referenced by SCIPcatchRowEvent().

SCIProwDropEvent()

SCIP_RETCODE SCIProwDropEvent	(	SCIP_ROW *	row,
		BMS_BLKMEM *	blkmem,
		SCIP_SET *	set,
		SCIP_EVENTTYPE	eventtype,
		SCIP_EVENTHDLR *	eventhdlr,
		SCIP_EVENTDATA *	eventdata,
		int	filterpos
	)

deletes event handler with given data from row's event filter

Parameters

row	row
blkmem	block memory
set	global SCIP settings
eventtype	event type mask of dropped event
eventhdlr	event handler to call for the event processing
eventdata	event data to pass to the event handler for the event processing
filterpos	position of event filter entry returned by SCIPvarCatchEvent(), or -1

Definition at line 7845 of file lp.c.

References SCIP_Row::eventfilter, SCIP_Row::name, NULL, SCIP_CALL, SCIP_OKAY, SCIPeventfilterDel(), and SCIPsetDebugMsg.

Referenced by SCIPdropRowEvent().

SCIProwMarkNotRemovableLocal()

void SCIProwMarkNotRemovableLocal	(	SCIP_ROW *	row,
		SCIP_STAT *	stat
	)

marks a row to be not removable from the LP in the current node because it became obsolete

Parameters

row	LP row
stat	problem statistics

Definition at line 7866 of file lp.c.

References SCIP_Stat::nnodes, NULL, and SCIP_Row::obsoletenode.

Referenced by SCIPmarkRowNotRemovableLocal().

markColDeleted()

static void markColDeleted ( SCIP_COL *  col )

static

resets column data to represent a column not in the LP solver

Parameters

col	column to be marked deleted

Definition at line 7885 of file lp.c.

References SCIP_Col::basisstatus, FALSE, SCIP_Col::farkascoef, SCIP_Col::lpipos, NULL, SCIP_Col::primsol, SCIP_Col::redcost, SCIP_Col::sbdown, SCIP_Col::sbdownvalid, SCIP_Col::sbitlim, SCIP_Col::sbup, SCIP_Col::sbupvalid, SCIP_BASESTAT_ZERO, SCIP_INVALID, SCIP_Col::validfarkaslp, and SCIP_Col::validredcostlp.

Referenced by lpDelColset(), and lpFlushDelCols().

lpFlushDelCols()

static SCIP_RETCODE lpFlushDelCols ( SCIP_LP *  lp )

static

applies all cached column removals to the LP solver

Parameters

lp	current LP data

Definition at line 7907 of file lp.c.

References SCIP_Col::coefchanged, SCIP_Lp::cols, SCIP_Lp::diving, FALSE, SCIP_Lp::flushdeletedcols, SCIP_Lp::lpi, SCIP_Lp::lpicols, SCIP_Lp::lpifirstchgcol, SCIP_Col::lpipos, SCIP_Lp::lpobjval, SCIP_Lp::lpsolstat, markColDeleted(), SCIP_Lp::ncols, SCIP_Lp::nlpicols, NULL, SCIP_Lp::primalchecked, SCIP_Lp::primalfeasible, SCIP_CALL, SCIP_INVALID, SCIP_LPSOLSTAT_NOTSOLVED, SCIP_OKAY, SCIPdebugMessage, SCIPlpiDelCols(), SCIP_Lp::solved, TRUE, and SCIP_Lp::updateintegrality.

Referenced by SCIPlpFlush().

computeLPBounds()

static void computeLPBounds ( SCIP_LP *  lp, SCIP_SET *  set, SCIP_COL *  col, SCIP_Real  lpiinf, SCIP_Real *  lb, SCIP_Real *  ub  )

static

computes for the given column the lower and upper bound that should be flushed into the LP depending on lazy bounds and diving mode; in diving mode, lazy bounds are ignored, i.e., the bounds are explicitly added to the LP in any case

Parameters

lp	current LP data
set	global SCIP settings
col	column to compute bounds for
lpiinf	infinity value if the LP solver
lb	pointer to store the new lower bound
ub	pointer to store the new upper bound

Definition at line 7958 of file lp.c.

References SCIP_Col::lazylb, SCIP_Col::lazyub, SCIP_Col::lb, NULL, SCIPlpDiving(), SCIPsetIsGE(), SCIPsetIsInfinity(), SCIPsetIsLE(), and SCIP_Col::ub.

Referenced by lpFlushAddCols(), and lpFlushChgCols().

lpFlushAddCols()

static SCIP_RETCODE lpFlushAddCols ( SCIP_LP *  lp, BMS_BLKMEM *  blkmem, SCIP_SET *  set, SCIP_EVENTQUEUE *  eventqueue  )

static

applies all cached column additions to the LP solver

Parameters

lp	current LP data
blkmem	block memory
set	global SCIP settings
eventqueue	event queue

Definition at line 7993 of file lp.c.

References SCIP_Col::coefchanged, colLink(), SCIP_Lp::cols, computeLPBounds(), debugColPrint, SCIP_Lp::diving, SCIP_Lp::dualchecked, SCIP_Lp::dualfeasible, ensureLpicolsSize(), FALSE, SCIP_Col::farkascoef, SCIP_Lp::flushaddedcols, SCIP_Col::flushedlb, SCIP_Col::flushedobj, SCIP_Col::flushedub, SCIP_Col::lbchanged, SCIP_Col::len, SCIP_Lp::lpi, SCIP_Lp::lpicols, SCIP_Lp::lpifirstchgcol, SCIP_Col::lpipos, SCIP_Row::lpipos, SCIP_Lp::lpobjval, SCIP_Col::lppos, SCIP_Lp::lpsolstat, SCIP_Lp::ncols, SCIP_Lp::nlpicols, SCIP_Col::nlprows, NULL, SCIP_Col::obj, SCIP_Col::objchanged, SCIP_Col::primsol, SCIP_Col::redcost, SCIP_Col::rows, SCIP_Col::sbdown, SCIP_Col::sbdownvalid, SCIP_Col::sbitlim, SCIP_Col::sbup, SCIP_Col::sbupvalid, SCIP_CALL, SCIP_INVALID, SCIP_LPSOLSTAT_NOTSOLVED, SCIP_OKAY, SCIP_Real, SCIP_VARSTATUS_COLUMN, SCIPlpiAddCols(), SCIPlpiInfinity(), SCIPsetAllocBufferArray, SCIPsetDebugMsg, SCIPsetFreeBufferArray, SCIPvarGetCol(), SCIPvarGetName(), SCIPvarGetStatus(), SCIP_Lp::solved, TRUE, SCIP_Col::ubchanged, SCIP_Lp::updateintegrality, SCIP_Col::validfarkaslp, SCIP_Col::validredcostlp, SCIP_Col::vals, and SCIP_Col::var.

Referenced by SCIPlpFlush().

markRowDeleted()

static void markRowDeleted ( SCIP_ROW *  row )

static

resets row data to represent a row not in the LP solver

Parameters

row	row to be marked deleted

Definition at line 8151 of file lp.c.

References SCIP_Row::activity, SCIP_Row::basisstatus, SCIP_Row::dualfarkas, SCIP_Row::dualsol, SCIP_Row::lpipos, NULL, SCIP_BASESTAT_BASIC, SCIP_INVALID, and SCIP_Row::validactivitylp.

Referenced by lpDelRowset(), and lpFlushDelRows().

lpFlushDelRows()

static SCIP_RETCODE lpFlushDelRows ( SCIP_LP *  lp, BMS_BLKMEM *  blkmem, SCIP_SET *  set  )

static

applies all cached row removals to the LP solver

Parameters

lp	current LP data
blkmem	block memory
set	global SCIP settings

Definition at line 8167 of file lp.c.

References SCIP_Row::coefchanged, SCIP_Lp::dualchecked, SCIP_Lp::dualfeasible, FALSE, SCIP_Lp::flushdeletedrows, SCIP_Lp::lpi, SCIP_Lp::lpifirstchgrow, SCIP_Row::lpipos, SCIP_Lp::lpirows, SCIP_Lp::lpobjval, SCIP_Lp::lpsolstat, markRowDeleted(), SCIP_Lp::nlpirows, SCIP_Lp::nrows, NULL, SCIP_Lp::rows, SCIP_CALL, SCIP_INVALID, SCIP_LPSOLSTAT_NOTSOLVED, SCIP_OKAY, SCIPlpiDelRows(), SCIProwRelease(), SCIPsetDebugMsg, SCIP_Lp::solved, and TRUE.

Referenced by SCIPlpFlush().

lpFlushAddRows()

static SCIP_RETCODE lpFlushAddRows ( SCIP_LP *  lp, BMS_BLKMEM *  blkmem, SCIP_SET *  set, SCIP_EVENTQUEUE *  eventqueue  )

static

applies all cached row additions and removals to the LP solver

Parameters

lp	current LP data
blkmem	block memory
set	global SCIP settings
eventqueue	event queue

Definition at line 8216 of file lp.c.

References SCIP_Row::activity, SCIP_Row::coefchanged, SCIP_Row::cols, SCIP_Row::constant, debugRowPrint, SCIP_Row::dualfarkas, SCIP_Row::dualsol, ensureLpirowsSize(), FALSE, SCIP_Lp::flushaddedrows, SCIP_Row::flushedlhs, SCIP_Row::flushedrhs, SCIP_Row::len, SCIP_Row::lhs, SCIP_Row::lhschanged, SCIP_Lp::lpi, SCIP_Lp::lpifirstchgrow, SCIP_Col::lpipos, SCIP_Row::lpipos, SCIP_Lp::lpirows, SCIP_Lp::lpobjval, SCIP_Row::lppos, SCIP_Lp::lpsolstat, SCIP_Row::name, SCIP_Row::nlpcols, SCIP_Lp::nlpirows, SCIP_Lp::nrows, NULL, SCIP_Lp::primalchecked, SCIP_Lp::primalfeasible, r, SCIP_Row::rhs, SCIP_Row::rhschanged, rowLink(), SCIP_Lp::rows, SCIP_CALL, SCIP_INVALID, SCIP_LPSOLSTAT_NOTSOLVED, SCIP_OKAY, SCIP_Real, SCIPlpiAddRows(), SCIPlpiInfinity(), SCIProwCapture(), SCIPsetAllocBufferArray, SCIPsetDebugMsg, SCIPsetDebugMsgPrint, SCIPsetFreeBufferArray, SCIPsetIsInfinity(), SCIPvarGetName(), SCIP_Lp::solved, TRUE, SCIP_Row::validactivitylp, SCIP_Row::vals, and SCIP_Col::var.

Referenced by SCIPlpFlush().

lpFlushChgCols()

static SCIP_RETCODE lpFlushChgCols ( SCIP_LP *  lp, SCIP_SET *  set  )

static

applies all cached column bound and objective changes to the LP

Parameters

lp	current LP data
set	global SCIP settings

Definition at line 8364 of file lp.c.

References SCIP_Lp::chgcols, computeLPBounds(), SCIP_Lp::dualchecked, SCIP_Lp::dualfeasible, FALSE, SCIP_Col::flushedlb, SCIP_Col::flushedobj, SCIP_Col::flushedub, SCIP_Col::lbchanged, SCIP_Lp::lpi, SCIP_Col::lpipos, SCIP_Lp::lpobjval, SCIP_Lp::lpsolstat, SCIP_Lp::nchgcols, SCIP_Lp::ncols, NULL, SCIP_Col::obj, SCIP_Col::objchanged, SCIP_Lp::primalchecked, SCIP_Lp::primalfeasible, SCIP_Bool, SCIP_CALL, SCIP_INVALID, SCIP_LPSOLSTAT_NOTSOLVED, SCIP_OKAY, SCIP_Real, SCIP_VARSTATUS_COLUMN, SCIPlpiChgBounds(), SCIPlpiChgObj(), SCIPlpiGetBounds(), SCIPlpiGetObj(), SCIPlpiGetSolverName(), SCIPlpiInfinity(), SCIPsetAllocBufferArray, SCIPsetDebugMsg, SCIPsetFreeBufferArray, SCIPsetIsFeasEQ(), SCIPsetIsInfinity(), SCIPvarGetCol(), SCIPvarGetStatus(), SCIP_Lp::solved, SCIP_Col::ubchanged, and SCIP_Col::var.

Referenced by SCIPlpFlush().

lpFlushChgRows()

static SCIP_RETCODE lpFlushChgRows ( SCIP_LP *  lp, SCIP_SET *  set  )

static

applies all cached row side changes to the LP

Parameters

lp	current LP data
set	global SCIP settings

Definition at line 8512 of file lp.c.

References SCIP_Lp::chgrows, SCIP_Row::constant, FALSE, SCIP_Row::flushedlhs, SCIP_Row::flushedrhs, SCIP_Row::lhs, SCIP_Row::lhschanged, SCIP_Lp::lpi, SCIP_Row::lpipos, SCIP_Lp::lpobjval, SCIP_Lp::lpsolstat, SCIP_Lp::nchgrows, SCIP_Lp::nrows, NULL, SCIP_Lp::primalchecked, SCIP_Lp::primalfeasible, SCIP_Row::rhs, SCIP_Row::rhschanged, SCIP_Bool, SCIP_CALL, SCIP_INVALID, SCIP_LPSOLSTAT_NOTSOLVED, SCIP_OKAY, SCIP_Real, SCIPlpiChgSides(), SCIPlpiGetSides(), SCIPlpiGetSolverName(), SCIPlpiInfinity(), SCIPsetAllocBufferArray, SCIPsetDebugMsg, SCIPsetFreeBufferArray, SCIPsetIsInfinity(), SCIPsetIsSumEQ(), and SCIP_Lp::solved.

Referenced by SCIPlpFlush().

lpCopyIntegrality()

static SCIP_RETCODE lpCopyIntegrality ( SCIP_LP *  lp, SCIP_SET *  set  )

static

copy integrality information to the LP

Parameters

lp	current LP data
set	global SCIP settings

Definition at line 8611 of file lp.c.

References SCIP_Lp::cols, FALSE, SCIP_Lp::lpi, SCIP_Lp::ncols, NULL, SCIP_CALL, SCIP_OKAY, SCIPcolGetVar(), SCIPlpiSetIntegralityInformation(), SCIPsetAllocBufferArray, SCIPsetFreeBufferArray, SCIPvarIsBinary(), SCIPvarIsIntegral(), and SCIP_Lp::updateintegrality.

Referenced by lpSolveStable().

SCIPlpFlush()

SCIP_RETCODE SCIPlpFlush	(	SCIP_LP *	lp,
		BMS_BLKMEM *	blkmem,
		SCIP_SET *	set,
		SCIP_EVENTQUEUE *	eventqueue
	)

applies all cached changes to the LP solver

Parameters

lp	current LP data
blkmem	block memory
set	global SCIP settings
eventqueue	event queue

Definition at line 8659 of file lp.c.

References checkLinks, SCIP_Lp::cutoffbound, FALSE, SCIP_Lp::flushaddedcols, SCIP_Lp::flushaddedrows, SCIP_Lp::flushdeletedcols, SCIP_Lp::flushdeletedrows, SCIP_Lp::flushed, lpCutoffDisabled, lpFlushAddCols(), lpFlushAddRows(), lpFlushChgCols(), lpFlushChgRows(), lpFlushDelCols(), lpFlushDelRows(), SCIP_Lp::lpi, SCIP_Lp::lpifirstchgcol, SCIP_Lp::lpifirstchgrow, SCIP_Lp::lpiobjlim, SCIP_Lp::lpsolstat, SCIP_Lp::nchgcols, SCIP_Lp::nchgrows, SCIP_Lp::ncols, SCIP_Lp::nlpicols, SCIP_Lp::nlpirows, SCIP_Lp::nrows, NULL, SCIP_CALL, SCIP_LPSOLSTAT_NOTSOLVED, SCIP_OKAY, SCIPlpiGetNCols(), SCIPlpiGetNRows(), SCIPsetDebugMsg, SCIP_Lp::solved, and TRUE.

Referenced by focusnodeCleanupVars(), lpFlushAndSolve(), priceAndCutLoop(), SCIPflushLP(), SCIPlpEndDive(), SCIPlpReset(), SCIPlpSetState(), SCIPlpSolveAndEval(), SCIPtreeEndProbing(), SCIPwriteLP(), and SCIPwriteMIP().

SCIPlpMarkFlushed()

SCIP_RETCODE SCIPlpMarkFlushed	(	SCIP_LP *	lp,
		SCIP_SET *	set
	)

marks the LP to be flushed, even if the LP thinks it is not flushed

Parameters

lp	current LP data
set	global SCIP settings

Definition at line 8721 of file lp.c.

References checkLinks, SCIP_Lp::chgcols, SCIP_Lp::chgrows, SCIP_Col::coefchanged, SCIP_Row::coefchanged, SCIP_Lp::cols, SCIP_Row::constant, FALSE, SCIP_Lp::flushed, SCIP_Col::flushedlb, SCIP_Row::flushedlhs, SCIP_Col::flushedobj, SCIP_Row::flushedrhs, SCIP_Col::flushedub, SCIP_Col::lb, SCIP_Col::lbchanged, SCIP_Row::lhs, SCIP_Row::lhschanged, SCIP_Lp::lpi, SCIP_Lp::lpicols, SCIP_Lp::lpifirstchgcol, SCIP_Lp::lpifirstchgrow, SCIP_Col::lpipos, SCIP_Row::lpipos, SCIP_Lp::lpirows, SCIP_Lp::nchgcols, SCIP_Lp::nchgrows, SCIP_Lp::ncols, SCIP_Lp::nlpicols, SCIP_Lp::nlpirows, SCIP_Lp::nrows, NULL, SCIP_Col::obj, SCIP_Col::objchanged, SCIP_Row::rhs, SCIP_Row::rhschanged, SCIP_Lp::rows, SCIP_Bool, SCIP_CALL, SCIP_OKAY, SCIP_Real, SCIP_VARSTATUS_COLUMN, SCIPlpiGetBounds(), SCIPlpiGetObj(), SCIPlpiGetSides(), SCIPlpiGetSolverName(), SCIPlpiInfinity(), SCIPsetIsInfinity(), SCIPsetIsSumEQ(), SCIPvarGetCol(), SCIPvarGetStatus(), TRUE, SCIP_Col::ub, SCIP_Col::ubchanged, and SCIP_Col::var.

colUpdateAddLP()

static void colUpdateAddLP ( SCIP_COL *  col, SCIP_SET *  set  )

static

updates link data after addition of column

Parameters

col	LP column
set	global SCIP settings

Definition at line 8849 of file lp.c.

References SCIP_Row::cols, FALSE, SCIP_Col::len, SCIP_Col::linkpos, SCIP_Row::linkpos, SCIP_Row::lpcolssorted, SCIP_Col::lppos, SCIP_Row::nlpcols, NULL, rowAddNorms(), SCIP_Col::rows, rowSwapCoefs(), and SCIP_Row::vals.

Referenced by SCIPlpAddCol().

rowUpdateAddLP()

static void rowUpdateAddLP ( SCIP_ROW *  row )

static

updates link data after addition of row

Parameters

row

LP row

Definition at line 8889 of file lp.c.

References SCIP_Row::cols, colSwapCoefs(), FALSE, SCIP_Row::len, SCIP_Col::linkpos, SCIP_Row::linkpos, SCIP_Row::lppos, SCIP_Col::lprowssorted, SCIP_Col::nlprows, NULL, and SCIP_Col::rows.

Referenced by SCIPlpAddRow().

colUpdateDelLP()

static void colUpdateDelLP ( SCIP_COL *  col, SCIP_SET *  set  )

static

updates link data after removal of column

Parameters

col	LP column
set	global SCIP settings

Definition at line 8924 of file lp.c.

References SCIP_Row::cols, FALSE, SCIP_Col::len, SCIP_Col::linkpos, SCIP_Row::linkpos, SCIP_Col::lppos, SCIP_Row::nlpcols, SCIP_Row::nonlpcolssorted, NULL, rowDelNorms(), SCIP_Col::rows, rowSwapCoefs(), TRUE, and SCIP_Row::vals.

Referenced by lpDelColset(), and SCIPlpShrinkCols().

rowUpdateDelLP()

static void rowUpdateDelLP ( SCIP_ROW *  row )

static

updates link data after removal of row

Parameters

row

LP row

Definition at line 8963 of file lp.c.

References SCIP_Row::cols, colSwapCoefs(), FALSE, SCIP_Row::len, SCIP_Col::linkpos, SCIP_Row::linkpos, SCIP_Row::lppos, SCIP_Col::nlprows, SCIP_Col::nonlprowssorted, NULL, and SCIP_Col::rows.

Referenced by lpDelRowset(), and SCIPlpShrinkRows().

allocDiveChgSideArrays()

static SCIP_RETCODE allocDiveChgSideArrays ( SCIP_LP *  lp, int  initsize  )

static

Parameters

lp	LP data object
initsize	initial size of the arrays

Definition at line 8997 of file lp.c.

References BMSallocMemoryArray, SCIP_Lp::divechgrows, SCIP_Lp::divechgsides, SCIP_Lp::divechgsidessize, SCIP_Lp::divechgsidetypes, SCIP_Lp::ndivechgsides, NULL, SCIP_ALLOC, and SCIP_OKAY.

Referenced by SCIPlpCreate().

reallocDiveChgSideArrays()

static SCIP_RETCODE reallocDiveChgSideArrays ( SCIP_LP *  lp, int  minsize, SCIP_Real  growfact  )

static

Parameters

lp	LP data object
minsize	minimal number of elements
growfact	growing factor

Definition at line 9019 of file lp.c.

References BMSreallocMemoryArray, SCIP_Lp::divechgrows, SCIP_Lp::divechgsides, SCIP_Lp::divechgsidessize, SCIP_Lp::divechgsidetypes, MAX, SCIP_Lp::ndivechgsides, NULL, SCIP_ALLOC, and SCIP_OKAY.

Referenced by SCIPlpRecordOldRowSideDive().

freeDiveChgSideArrays()

static void freeDiveChgSideArrays ( SCIP_LP *  lp )

static

Parameters

lp	LP data object

Definition at line 9045 of file lp.c.

References BMSfreeMemoryArrayNull, SCIP_Lp::divechgrows, SCIP_Lp::divechgsides, SCIP_Lp::divechgsidessize, SCIP_Lp::divechgsidetypes, SCIP_Lp::ndivechgsides, and NULL.

Referenced by SCIPlpFree().

SCIPlpCreate()

SCIP_RETCODE SCIPlpCreate	(	SCIP_LP **	lp,
		SCIP_SET *	set,
		SCIP_MESSAGEHDLR *	messagehdlr,
		SCIP_STAT *	stat,
		const char *	name
	)

creates empty LP data object

Parameters

lp	pointer to LP data object
set	global SCIP settings
messagehdlr	message handler
stat	problem statistics
name	problem name

Definition at line 9065 of file lp.c.

References allocDiveChgSideArrays(), BMSallocMemory, DIVESTACKINITSIZE, FALSE, SCIP_Stat::lpcount, lpSetBoolpar(), lpSetIntpar(), lpSetRealpar(), NULL, SCIP_ALLOC, SCIP_Bool, SCIP_CALL, SCIP_INVALID, SCIP_LPALGO_DUALSIMPLEX, SCIP_LPPAR_BARRIERCONVTOL, SCIP_LPPAR_CONDITIONLIMIT, SCIP_LPPAR_DUALFEASTOL, SCIP_LPPAR_FASTMIP, SCIP_LPPAR_FEASTOL, SCIP_LPPAR_FROMSCRATCH, SCIP_LPPAR_LPINFO, SCIP_LPPAR_LPITLIM, SCIP_LPPAR_MARKOWITZ, SCIP_LPPAR_OBJLIM, SCIP_LPPAR_POLISHING, SCIP_LPPAR_PRESOLVING, SCIP_LPPAR_PRICING, SCIP_LPPAR_RANDOMSEED, SCIP_LPPAR_REFACTOR, SCIP_LPPAR_ROWREPSWITCH, SCIP_LPPAR_SCALING, SCIP_LPPAR_THREADS, SCIP_LPPAR_TIMING, SCIP_LPSOLSTAT_OPTIMAL, SCIP_OBJSEN_MINIMIZE, SCIP_OKAY, SCIP_PARAMETERWRONGVAL, SCIP_PRICING_AUTO, SCIP_VERBLEVEL_FULL, SCIPerrorMessage, SCIPlpiCreate(), SCIPlpiGetSolverName(), SCIPlpiInfinity(), SCIPlpResetFeastol(), SCIPmessagePrintVerbInfo(), SCIPsetBarrierconvtol(), SCIPsetDualfeastol(), SCIPsetInfinity(), and TRUE.

Referenced by SCIPtransformProb().

SCIPlpFree()

SCIP_RETCODE SCIPlpFree	(	SCIP_LP **	lp,
		BMS_BLKMEM *	blkmem,
		SCIP_SET *	set,
		SCIP_EVENTQUEUE *	eventqueue,
		SCIP_EVENTFILTER *	eventfilter
	)

frees LP data object

Parameters

lp	pointer to LP data object
blkmem	block memory
set	global SCIP settings
eventqueue	event queue
eventfilter	global event filter

Definition at line 9357 of file lp.c.

References BMSfreeMemory, BMSfreeMemoryArrayNull, BMSfreeMemoryNull, freeDiveChgSideArrays(), NULL, SCIP_CALL, SCIP_OKAY, SCIPlpClear(), SCIPlpiFree(), and SCIProwRelease().

Referenced by freeTransform().

SCIPlpReset()

SCIP_RETCODE SCIPlpReset	(	SCIP_LP *	lp,
		BMS_BLKMEM *	blkmem,
		SCIP_SET *	set,
		SCIP_STAT *	stat,
		SCIP_EVENTQUEUE *	eventqueue,
		SCIP_EVENTFILTER *	eventfilter
	)

resets the LP to the empty LP by removing all columns and rows from LP, releasing all rows, and flushing the changes to the LP solver

Parameters

lp	LP data
blkmem	block memory
set	global SCIP settings
stat	problem statistics
eventqueue	event queue
eventfilter	global event filter

Definition at line 9402 of file lp.c.

References SCIP_Lp::dualchecked, SCIP_Lp::dualfeasible, FALSE, SCIP_Lp::lastlpalgo, SCIP_Stat::lpcount, SCIP_Lp::lpobjval, SCIP_Lp::lpsolstat, NULL, SCIP_Lp::primalchecked, SCIP_Lp::primalfeasible, SCIP_CALL, SCIP_LPALGO_DUALSIMPLEX, SCIP_LPSOLSTAT_OPTIMAL, SCIP_OKAY, SCIPlpClear(), SCIPlpFlush(), SCIP_Lp::solisbasic, SCIP_Lp::solved, TRUE, SCIP_Lp::validdegeneracylp, SCIP_Lp::validfarkaslp, SCIP_Lp::validsoldirlp, SCIP_Lp::validsoldirsol, and SCIP_Lp::validsollp.

Referenced by freeReoptSolve(), freeSolve(), and initSolve().

SCIPlpAddCol()

SCIP_RETCODE SCIPlpAddCol	(	SCIP_LP *	lp,
		SCIP_SET *	set,
		SCIP_COL *	col,
		int	depth
	)

adds a column to the LP

Parameters

lp	LP data
set	global SCIP settings
col	LP column
depth	depth in the tree where the column addition is performed

Definition at line 9436 of file lp.c.

References SCIP_Col::age, checkLinks, SCIP_Lp::cols, colUpdateAddLP(), SCIP_Lp::diving, ensureColsSize(), ensureLazycolsSize(), FALSE, SCIP_Lp::flushed, SCIP_Col::integral, SCIP_Lp::lazycols, SCIP_Col::lazylb, SCIP_Col::lazyub, SCIP_Col::lb, SCIP_Col::len, SCIP_Col::lpdepth, SCIP_Col::lppos, lpUpdateObjNorms(), SCIP_Row::name, SCIP_Lp::ncols, SCIP_Lp::nlazycols, SCIP_Lp::nremovablecols, SCIP_Lp::nrows, NULL, SCIP_Col::obj, SCIP_Col::removable, SCIP_Col::rows, SCIP_CALL, SCIP_OKAY, SCIP_VARSTATUS_COLUMN, SCIPsetDebugMsg, SCIPsetDebugMsgPrint, SCIPsetIsInfinity(), SCIPvarGetCol(), SCIPvarGetName(), SCIPvarGetStatus(), SCIPvarIsIntegral(), SCIP_Col::ub, SCIP_Col::unchangedobj, SCIP_Col::vals, and SCIP_Col::var.

Referenced by forkAddLP(), pseudoforkAddLP(), SCIPpricestoreApplyVars(), and subrootConstructLP().

SCIPlpAddRow()

SCIP_RETCODE SCIPlpAddRow	(	SCIP_LP *	lp,
		BMS_BLKMEM *	blkmem,
		SCIP_SET *	set,
		SCIP_EVENTQUEUE *	eventqueue,
		SCIP_EVENTFILTER *	eventfilter,
		SCIP_ROW *	row,
		int	depth
	)

adds a row to the LP and captures it

Parameters

lp	LP data
blkmem	block memory buffers
set	global SCIP settings
eventqueue	event queue
eventfilter	global event filter
row	LP row
depth	depth in the tree where the row addition is performed

Definition at line 9495 of file lp.c.

References SCIP_Row::age, checkLinks, SCIP_Row::cols, SCIP_Row::constant, ensureRowsSize(), SCIP_EventFilter::eventmask, FALSE, SCIP_Lp::flushed, SCIP_EventFilter::len, SCIP_Row::len, SCIP_Row::lhs, SCIP_Row::lpdepth, SCIP_Row::lppos, SCIP_Row::name, SCIP_Lp::ncols, SCIP_Lp::nremovablerows, SCIP_Lp::nrows, NULL, SCIP_Row::removable, SCIP_Row::rhs, rowCalcNorms(), SCIP_Lp::rows, rowUpdateAddLP(), SCIP_CALL, SCIP_EVENTTYPE_ROWADDEDLP, SCIP_OKAY, SCIPeventCreateRowAddedLP(), SCIPeventqueueAdd(), SCIProwCapture(), SCIProwLock(), SCIPsetDebugMsg, SCIPsetDebugMsgPrint, SCIPsetIsZero(), SCIPvarGetName(), SCIP_Row::vals, and SCIP_Col::var.

Referenced by forkAddLP(), pseudoforkAddLP(), SCIPaddRowDive(), SCIPaddRowProbing(), sepastoreApplyCut(), and subrootConstructLP().

checkLazyColArray()

static void checkLazyColArray ( SCIP_LP *  lp, SCIP_SET *  set  )

static

method checks if all columns in the lazycols array have at least one lazy bound and also have a counter part in the cols array; furthermore, it is checked if columns in the cols array which have a lazy bound have a counter part in the lazycols array

Parameters

lp	LP data
set	global SCIP settings

Definition at line 9566 of file lp.c.

References SCIP_Lp::cols, FALSE, SCIP_Lp::lazycols, SCIP_Col::lazylb, SCIP_Col::lazyub, SCIP_Lp::ncols, SCIP_Lp::nlazycols, NULL, SCIP_Bool, SCIPsetIsInfinity(), and TRUE.

Referenced by lpDelColset(), and SCIPlpShrinkCols().

SCIPlpShrinkCols()

SCIP_RETCODE SCIPlpShrinkCols	(	SCIP_LP *	lp,
		SCIP_SET *	set,
		int	newncols
	)

removes all columns after the given number of cols from the LP

Parameters

lp	LP data
set	global SCIP settings
newncols	new number of columns in the LP

Definition at line 9619 of file lp.c.

References checkLazyColArray(), checkLinks, SCIP_Lp::cols, colUpdateDelLP(), SCIP_Lp::diving, FALSE, SCIP_Lp::flushed, SCIP_Lp::lazycols, SCIP_Col::len, SCIP_Col::lpdepth, SCIP_Lp::lpifirstchgcol, SCIP_Col::lppos, lpUpdateObjNorms(), SCIP_Lp::ncols, SCIP_Lp::nlazycols, SCIP_Lp::nremovablecols, NULL, SCIP_Col::removable, SCIP_Col::rows, SCIP_OKAY, SCIP_VARSTATUS_COLUMN, SCIPsetDebugMsg, SCIPvarGetCol(), SCIPvarGetStatus(), SCIP_Col::unchangedobj, and SCIP_Col::var.

Referenced by focusnodeCleanupVars(), focusnodeToFork(), SCIPlpClear(), SCIPtreeLoadLP(), and treeBacktrackProbing().

SCIPlpShrinkRows()

SCIP_RETCODE SCIPlpShrinkRows	(	SCIP_LP *	lp,
		BMS_BLKMEM *	blkmem,
		SCIP_SET *	set,
		SCIP_EVENTQUEUE *	eventqueue,
		SCIP_EVENTFILTER *	eventfilter,
		int	newnrows
	)

removes and releases all rows after the given number of rows from the LP

Parameters

lp	LP data
blkmem	block memory
set	global SCIP settings
eventqueue	event queue
eventfilter	global event filter
newnrows	new number of rows in the LP

Definition at line 9691 of file lp.c.

References checkLinks, SCIP_Row::cols, SCIP_EventFilter::eventmask, FALSE, SCIP_Lp::flushed, SCIP_EventFilter::len, SCIP_Row::len, SCIP_Row::lpdepth, SCIP_Lp::lpifirstchgrow, SCIP_Row::lppos, SCIP_Lp::nremovablerows, SCIP_Lp::nrows, NULL, r, SCIP_Row::removable, SCIP_Lp::rows, rowUpdateDelLP(), SCIP_CALL, SCIP_EVENTTYPE_ROWDELETEDLP, SCIP_OKAY, SCIPeventCreateRowDeletedLP(), SCIPeventqueueAdd(), SCIProwRelease(), SCIProwUnlock(), and SCIPsetDebugMsg.

Referenced by focusnodeToFork(), SCIPlpClear(), SCIPlpEndDive(), SCIPtreeLoadLP(), and treeBacktrackProbing().

SCIPlpClear()

SCIP_RETCODE SCIPlpClear	(	SCIP_LP *	lp,
		BMS_BLKMEM *	blkmem,
		SCIP_SET *	set,
		SCIP_EVENTQUEUE *	eventqueue,
		SCIP_EVENTFILTER *	eventfilter
	)

removes all columns and rows from LP, releases all rows

Parameters

lp	LP data
blkmem	block memory
set	global SCIP settings
eventqueue	event queue
eventfilter	global event filter

Definition at line 9757 of file lp.c.

References SCIP_Lp::diving, NULL, SCIP_CALL, SCIP_OKAY, SCIPlpShrinkCols(), SCIPlpShrinkRows(), and SCIPsetDebugMsg.

Referenced by SCIPlpFree(), SCIPlpReset(), and SCIPtreeLoadLP().

SCIPlpMarkSize()

void SCIPlpMarkSize

(

SCIP_LP *

lp

)

remembers number of columns and rows to track the newly added ones

Parameters

lp	current LP data

Definition at line 9776 of file lp.c.

References SCIP_Lp::diving, SCIP_Lp::firstnewcol, SCIP_Lp::firstnewrow, SCIP_Lp::ncols, SCIP_Lp::nrows, and NULL.

Referenced by SCIPnodeFocus(), SCIPtreeLoadLP(), and treeCreateProbingNode().

SCIPlpSetSizeMark()

void SCIPlpSetSizeMark	(	SCIP_LP *	lp,
		int	nrows,
		int	ncols
	)

sets the remembered number of columns and rows to the given values

Parameters

lp	current LP data
nrows	number of rows to set the size marker to
ncols	number of columns to set the size marker to

Definition at line 9788 of file lp.c.

References SCIP_Lp::diving, SCIP_Lp::firstnewcol, SCIP_Lp::firstnewrow, and NULL.

Referenced by treeBacktrackProbing().

SCIPlpGetBasisInd()

SCIP_RETCODE SCIPlpGetBasisInd	(	SCIP_LP *	lp,
		int *	basisind
	)

gets all indices of basic columns and rows: index i >= 0 corresponds to column i, index i < 0 to row -i-1

Parameters

lp	LP data
basisind	pointer to store basis indices ready to keep number of rows entries

Definition at line 9802 of file lp.c.

References SCIP_Lp::flushed, SCIP_Lp::lpi, NULL, SCIP_CALL, SCIP_OKAY, SCIPlpiGetBasisInd(), SCIP_Lp::solisbasic, and SCIP_Lp::solved.

Referenced by SCIPgetLPBasisInd().

SCIPlpGetBase()

SCIP_RETCODE SCIPlpGetBase	(	SCIP_LP *	lp,
		int *	cstat,
		int *	rstat
	)

gets current basis status for columns and rows; arrays must be large enough to store the basis status

Parameters

lp	LP data
cstat	array to store column basis status, or NULL
rstat	array to store row basis status, or NULL

Definition at line 9819 of file lp.c.

References SCIP_Lp::flushed, SCIP_Lp::lpi, NULL, SCIP_CALL, SCIP_OKAY, SCIPlpiGetBase(), SCIP_Lp::solisbasic, and SCIP_Lp::solved.

SCIPlpGetBInvRow()

SCIP_RETCODE SCIPlpGetBInvRow	(	SCIP_LP *	lp,
		int	r,
		SCIP_Real *	coef,
		int *	inds,
		int *	ninds
	)

gets a row from the inverse basis matrix B^-1

Parameters

lp	LP data
r	row number
coef	pointer to store the coefficients of the row
inds	array to store the non-zero indices, or NULL
ninds	pointer to store the number of non-zero indices, or NULL (-1: if we do not store sparsity informations)

Definition at line 9836 of file lp.c.

References SCIP_Lp::flushed, SCIP_Lp::lpi, NULL, SCIP_CALL, SCIP_OKAY, SCIPlpiGetBInvRow(), SCIP_Lp::solisbasic, and SCIP_Lp::solved.

Referenced by SCIPgetLPBInvRow().

SCIPlpGetBInvCol()

SCIP_RETCODE SCIPlpGetBInvCol	(	SCIP_LP *	lp,
		int	c,
		SCIP_Real *	coef,
		int *	inds,
		int *	ninds
	)

gets a column from the inverse basis matrix B^-1

Parameters

lp	LP data
c	column number of B^-1; this is NOT the number of the column in the LP returned by SCIPcolGetLPPos(); you have to call SCIPgetBasisInd() to get the array which links the B^-1 column numbers to the row and column numbers of the LP! c must be between 0 and nrows-1, since the basis has the size nrows * nrows
coef	pointer to store the coefficients of the column
inds	array to store the non-zero indices, or NULL
ninds	pointer to store the number of non-zero indices, or NULL (-1: if we do not store sparsity informations)

Definition at line 9858 of file lp.c.

References SCIP_Lp::flushed, SCIP_Lp::lpi, NULL, SCIP_CALL, SCIP_OKAY, SCIPlpiGetBInvCol(), SCIP_Lp::solisbasic, and SCIP_Lp::solved.

Referenced by SCIPgetLPBInvCol().

SCIPlpGetBInvARow()

SCIP_RETCODE SCIPlpGetBInvARow	(	SCIP_LP *	lp,
		int	r,
		SCIP_Real *	binvrow,
		SCIP_Real *	coef,
		int *	inds,
		int *	ninds
	)

gets a row from the product of inverse basis matrix B^-1 and coefficient matrix A (i.e. from B^-1 * A)

Parameters

lp	LP data
r	row number
binvrow	row in B^-1 from prior call to SCIPlpGetBInvRow(), or NULL
coef	pointer to store the coefficients of the row
inds	array to store the non-zero indices, or NULL
ninds	pointer to store the number of non-zero indices, or NULL (-1: if we do not store sparsity informations)

Definition at line 9884 of file lp.c.

References SCIP_Lp::flushed, SCIP_Lp::lpi, NULL, SCIP_CALL, SCIP_OKAY, SCIPlpiGetBInvARow(), SCIP_Lp::solisbasic, and SCIP_Lp::solved.

Referenced by SCIPgetLPBInvARow().

SCIPlpGetBInvACol()

SCIP_RETCODE SCIPlpGetBInvACol	(	SCIP_LP *	lp,
		int	c,
		SCIP_Real *	coef,
		int *	inds,
		int *	ninds
	)

gets a column from the product of inverse basis matrix B^-1 and coefficient matrix A (i.e. from B^-1 * A), i.e., it computes B^-1 * A_c with A_c being the c'th column of A

Parameters

lp	LP data
c	column number which can be accessed by SCIPcolGetLPPos()
coef	pointer to store the coefficients of the column
inds	array to store the non-zero indices, or NULL
ninds	pointer to store the number of non-zero indices, or NULL (-1: if we do not store sparsity informations)

Definition at line 9909 of file lp.c.

References SCIP_Lp::flushed, SCIP_Lp::lpi, NULL, SCIP_CALL, SCIP_OKAY, SCIPlpiGetBInvACol(), SCIP_Lp::solisbasic, and SCIP_Lp::solved.

Referenced by SCIPgetLPBInvACol().

SCIPlpSumRows()

SCIP_RETCODE SCIPlpSumRows	(	SCIP_LP *	lp,
		SCIP_SET *	set,
		SCIP_PROB *	prob,
		SCIP_Real *	weights,
		SCIP_REALARRAY *	sumcoef,
		SCIP_Real *	sumlhs,
		SCIP_Real *	sumrhs
	)

calculates a weighted sum of all LP rows; for negative weights, the left and right hand side of the corresponding LP row are swapped in the summation

Parameters

lp	LP data
set	global SCIP settings
prob	problem data
weights	row weights in row summation
sumcoef	array to store sum coefficients indexed by variables' probindex
sumlhs	pointer to store the left hand side of the row summation
sumrhs	pointer to store the right hand side of the row summation

Definition at line 9933 of file lp.c.

References SCIP_Row::cols, SCIP_Row::cols_index, SCIP_Row::constant, FALSE, SCIP_Row::len, SCIP_Row::lhs, SCIP_Lp::nrows, NULL, SCIP_Prob::nvars, r, SCIP_Row::rhs, SCIP_Lp::rows, SCIP_Bool, SCIP_CALL, SCIP_OKAY, SCIP_VARSTATUS_COLUMN, SCIPrealarrayClear(), SCIPrealarrayExtend(), SCIPrealarrayIncVal(), SCIPsetInfinity(), SCIPsetIsInfinity(), SCIPsetIsZero(), SCIPvarGetCol(), SCIPvarGetProbindex(), SCIPvarGetStatus(), SCIP_Row::vals, SCIP_Col::var, and SCIP_Col::var_probindex.

Referenced by SCIPsumLPRows().

SCIPlpGetState()

SCIP_RETCODE SCIPlpGetState	(	SCIP_LP *	lp,
		BMS_BLKMEM *	blkmem,
		SCIP_LPISTATE **	lpistate
	)

stores LP state (like basis information) into LP state object

Parameters

lp	LP data
blkmem	block memory
lpistate	pointer to LP state information (like basis information)

Definition at line 10019 of file lp.c.

References SCIP_Lp::flushed, SCIP_Lp::lpi, SCIP_Lp::nlpicols, SCIP_Lp::nlpirows, NULL, SCIP_CALL, SCIP_OKAY, SCIPlpiGetState(), and SCIP_Lp::solved.

Referenced by forkCreate(), forkFree(), probingnodeUpdate(), and SCIPtreeStartProbing().

SCIPlpSetState()

SCIP_RETCODE SCIPlpSetState	(	SCIP_LP *	lp,
		BMS_BLKMEM *	blkmem,
		SCIP_SET *	set,
		SCIP_EVENTQUEUE *	eventqueue,
		SCIP_LPISTATE *	lpistate,
		SCIP_Bool	wasprimfeas,
		SCIP_Bool	wasprimchecked,
		SCIP_Bool	wasdualfeas,
		SCIP_Bool	wasdualchecked
	)

loads LP state (like basis information) into solver

Parameters

lp	LP data
blkmem	block memory
set	global SCIP settings
eventqueue	event queue
lpistate	LP state information (like basis information)
wasprimfeas	primal feasibility when LP state information was stored
wasprimchecked	true if the LP solution has passed the primal feasibility check
wasdualfeas	dual feasibility when LP state information was stored
wasdualchecked	true if the LP solution has passed the dual feasibility check

Definition at line 10043 of file lp.c.

References SCIP_Lp::dualchecked, SCIP_Lp::dualfeasible, FALSE, SCIP_Lp::flushed, SCIP_Lp::lpi, NULL, SCIP_Lp::primalchecked, SCIP_Lp::primalfeasible, SCIP_CALL, SCIP_OKAY, SCIPlpFlush(), SCIPlpiHasStateBasis(), SCIPlpiSetState(), SCIP_Lp::solisbasic, and SCIP_Lp::solved.

Referenced by SCIPlpEndDive(), SCIPtreeEndProbing(), SCIPtreeLoadLPState(), and SCIPtreeLoadProbingLPState().

SCIPlpFreeState()

SCIP_RETCODE SCIPlpFreeState	(	SCIP_LP *	lp,
		BMS_BLKMEM *	blkmem,
		SCIP_LPISTATE **	lpistate
	)

frees LP state information

Parameters

lp	LP data
blkmem	block memory
lpistate	pointer to LP state information (like basis information)

Definition at line 10085 of file lp.c.

References SCIP_Lp::lpi, NULL, SCIP_CALL, SCIP_OKAY, and SCIPlpiFreeState().

Referenced by forkReleaseLPIState(), probingnodeFree(), probingnodeUpdate(), SCIPlpEndDive(), SCIPtreeEndProbing(), SCIPtreeSetProbingLPState(), and subrootReleaseLPIState().

SCIPlpGetNorms()

SCIP_RETCODE SCIPlpGetNorms	(	SCIP_LP *	lp,
		BMS_BLKMEM *	blkmem,
		SCIP_LPINORMS **	lpinorms
	)

stores pricing norms into LP norms object

Parameters

lp	LP data
blkmem	block memory
lpinorms	pointer to LP pricing norms information

Definition at line 10102 of file lp.c.

References SCIP_Lp::flushed, SCIP_Lp::lpi, SCIP_Lp::nlpicols, SCIP_Lp::nlpirows, NULL, SCIP_CALL, SCIP_OKAY, SCIPlpiGetNorms(), and SCIP_Lp::solved.

Referenced by probingnodeUpdate(), and SCIPtreeStartProbing().

SCIPlpSetNorms()

SCIP_RETCODE SCIPlpSetNorms	(	SCIP_LP *	lp,
		BMS_BLKMEM *	blkmem,
		SCIP_LPINORMS *	lpinorms
	)

loads pricing norms from LP norms object into solver

Parameters

lp	LP data
blkmem	block memory
lpinorms	LP pricing norms information

Definition at line 10126 of file lp.c.

References SCIP_Lp::flushed, SCIP_Lp::lpi, NULL, SCIP_CALL, SCIP_OKAY, and SCIPlpiSetNorms().

Referenced by SCIPtreeEndProbing(), and SCIPtreeLoadProbingLPState().

SCIPlpFreeNorms()

SCIP_RETCODE SCIPlpFreeNorms	(	SCIP_LP *	lp,
		BMS_BLKMEM *	blkmem,
		SCIP_LPINORMS **	lpinorms
	)

frees pricing norms information

Parameters

lp	LP data
blkmem	block memory
lpinorms	pointer to LP pricing norms information

Definition at line 10146 of file lp.c.

References SCIP_Lp::lpi, NULL, SCIP_CALL, SCIP_OKAY, and SCIPlpiFreeNorms().

Referenced by probingnodeFree(), probingnodeUpdate(), SCIPtreeEndProbing(), and SCIPtreeSetProbingLPState().

SCIPlpGetCutoffbound()

SCIP_Real SCIPlpGetCutoffbound

(

SCIP_LP *

lp

)

return the current cutoff bound of the lp

Parameters

lp	current LP data

Definition at line 10160 of file lp.c.

References SCIP_Lp::cutoffbound, and NULL.

Referenced by SCIPreoptCheckCutoff().

SCIPlpSetCutoffbound()

SCIP_RETCODE SCIPlpSetCutoffbound	(	SCIP_LP *	lp,
		SCIP_SET *	set,
		SCIP_PROB *	prob,
		SCIP_Real	cutoffbound
	)

sets the upper objective limit of the LP solver

Parameters

lp	current LP data
set	global SCIP settings
prob	problem data
cutoffbound	new upper objective limit

Definition at line 10170 of file lp.c.

References SCIP_Lp::cutoffbound, FALSE, SCIP_Lp::flushed, lpCutoffDisabled, SCIP_Lp::lpobjval, SCIP_Lp::lpsolstat, NULL, SCIP_INVALID, SCIP_LPSOLSTAT_NOTSOLVED, SCIP_LPSOLSTAT_OBJLIMIT, SCIP_LPSOLSTAT_OPTIMAL, SCIP_OKAY, SCIPlpDivingObjChanged(), SCIPlpGetObjval(), SCIPlpGetSolstat(), SCIPsetDebugMsg, SCIPsetIsInfinity(), and SCIP_Lp::solved.

Referenced by primalSetCutoffbound(), SCIPchgCutoffboundDive(), SCIPchgVarObjDive(), SCIPchgVarObjProbing(), SCIPendDive(), and treeBacktrackProbing().

SCIPlpGetFeastol()

SCIP_Real SCIPlpGetFeastol

(

SCIP_LP *

lp

)

gets current primal feasibility tolerance of LP solver

Parameters

lp	current LP data

Definition at line 10215 of file lp.c.

References SCIP_Lp::feastol, and NULL.

Referenced by SCIPgetLPFeastol(), and SCIPsetExitsolPlugins().

SCIPlpSetFeastol()

void SCIPlpSetFeastol	(	SCIP_LP *	lp,
		SCIP_SET *	set,
		SCIP_Real	newfeastol
	)

sets primal feasibility tolerance of LP solver

Parameters

lp	current LP data
set	global SCIP settings
newfeastol	new primal feasibility tolerance for LP

Definition at line 10225 of file lp.c.

References FALSE, SCIP_Lp::feastol, SCIP_Lp::lpsolstat, NULL, SCIP_LPSOLSTAT_NOTSOLVED, SCIPsetDebugMsg, and SCIP_Lp::solved.

Referenced by SCIPlpResetFeastol(), and SCIPsetLPFeastol().

SCIPlpResetFeastol()

void SCIPlpResetFeastol	(	SCIP_LP *	lp,
		SCIP_SET *	set
	)

resets primal feasibility tolerance of LP solver

Sets primal feasibility tolerance to min of numerics/lpfeastolfactor * numerics/feastol and relaxfeastol.

Parameters

lp	current LP data
set	global SCIP settings

Definition at line 10250 of file lp.c.

References NULL, SCIP_INVALID, SCIPlpSetFeastol(), SCIPsetDebugMsg, SCIPsetFeastol(), SCIPsetLPFeastolFactor(), and SCIPsetRelaxfeastol().

Referenced by SCIPlpCreate(), SCIPresetLPFeastol(), SCIPsetExitsolPlugins(), and solveNode().

lpalgoName()

static const char* lpalgoName ( SCIP_LPALGO  lpalgo )

static

returns the name of the given LP algorithm

Parameters

lpalgo

LP algorithm

Definition at line 10267 of file lp.c.

References SCIP_LPALGO_BARRIER, SCIP_LPALGO_BARRIERCROSSOVER, SCIP_LPALGO_DUALSIMPLEX, SCIP_LPALGO_PRIMALSIMPLEX, SCIPABORT, and SCIPerrorMessage.

Referenced by ignoreInstability(), lpAlgorithm(), lpSolve(), and lpSolveStable().

lpPrimalSimplex()

static SCIP_RETCODE lpPrimalSimplex ( SCIP_LP *  lp, SCIP_SET *  set, SCIP_STAT *  stat, SCIP_Bool  resolve, SCIP_Bool  keepsol, SCIP_Bool  instable, SCIP_Bool *  lperror  )

static

calls LPI to perform primal simplex, measures time and counts iterations, gets basis feasibility status

Parameters

lp	current LP data
set	global SCIP settings
stat	problem statistics
resolve	is this a resolving call (starting with feasible basis)?
keepsol	should the old LP solution be kept if no iterations were performed?
instable	is this a resolving call to avoid instable LPs?
lperror	pointer to store whether an unresolved LP error occurred

Definition at line 10290 of file lp.c.

References SCIP_Lp::diving, SCIP_Stat::divinglptime, FALSE, SCIP_Lp::flushed, SCIP_Lp::lastlpalgo, SCIP_Stat::lpcount, SCIP_Lp::lpi, SCIP_Lp::lpidualfeastol, SCIP_Lp::lpifastmip, SCIP_Lp::lpifeastol, SCIP_Lp::lpifromscratch, SCIP_Lp::lpiobjlim, SCIP_Lp::lpipresolving, SCIP_Lp::lpiscaling, SCIP_Lp::ncols, SCIP_Stat::ndivinglps, SCIP_Stat::nlps, SCIP_Stat::nnodes, SCIP_Stat::nprimallps, SCIP_Lp::nrows, NULL, SCIP_Stat::primallptime, SCIP_Lp::probing, SCIP_Stat::resolveinstablelptime, SCIP_CALL, SCIP_LPALGO_PRIMALSIMPLEX, SCIP_LPERROR, SCIP_MAXSTRLEN, SCIP_OKAY, SCIP_Real, SCIPclockGetTime(), SCIPclockStart(), SCIPclockStop(), SCIPlpGetIterations(), SCIPlpiSolvePrimal(), SCIPlpWrite(), SCIPsetDebugMsg, SCIPsnprintf(), SCIPstatAdd, SCIPstatIncrement, SCIPstatUpdate, SCIP_Lp::solisbasic, SCIP_Lp::strongbranchprobing, SCIP_Stat::strongbranchtime, TRUE, SCIP_Lp::validfarkaslp, and SCIP_Lp::validsollp.

Referenced by lpAlgorithm().

lpDualSimplex()

static SCIP_RETCODE lpDualSimplex ( SCIP_LP *  lp, SCIP_SET *  set, SCIP_STAT *  stat, SCIP_Bool  resolve, SCIP_Bool  keepsol, SCIP_Bool  instable, SCIP_Bool *  lperror  )

static

calls LPI to perform dual simplex, measures time and counts iterations

Parameters

lp	current LP data
set	global SCIP settings
stat	problem statistics
resolve	is this a resolving call (starting with feasible basis)?
keepsol	should the old LP solution be kept if no iterations were performed?
instable	is this a resolving call to avoid instable LPs?
lperror	pointer to store whether an unresolved LP error occurred

Definition at line 10448 of file lp.c.

References SCIP_Lp::diving, SCIP_Stat::divinglptime, SCIP_Stat::duallptime, FALSE, SCIP_Lp::flushed, SCIP_Lp::lastlpalgo, SCIP_Stat::lpcount, SCIP_Lp::lpi, SCIP_Lp::lpidualfeastol, SCIP_Lp::lpifastmip, SCIP_Lp::lpifeastol, SCIP_Lp::lpifromscratch, SCIP_Lp::lpiobjlim, SCIP_Lp::lpipresolving, SCIP_Lp::lpiscaling, SCIP_Lp::ncols, SCIP_Stat::ndivinglps, SCIP_Stat::nduallps, SCIP_Stat::nlps, SCIP_Stat::nnodes, SCIP_Lp::nrows, NULL, SCIP_Lp::probing, SCIP_Stat::resolveinstablelptime, SCIP_CALL, SCIP_LPALGO_DUALSIMPLEX, SCIP_LPERROR, SCIP_MAXSTRLEN, SCIP_OKAY, SCIP_Real, SCIPclockGetTime(), SCIPclockStart(), SCIPclockStop(), SCIPlpGetIterations(), SCIPlpiSolveDual(), SCIPlpWrite(), SCIPsetDebugMsg, SCIPsnprintf(), SCIPstatAdd, SCIPstatIncrement, SCIPstatUpdate, SCIP_Lp::solisbasic, SCIP_Lp::strongbranchprobing, SCIP_Stat::strongbranchtime, TRUE, SCIP_Lp::validfarkaslp, and SCIP_Lp::validsollp.

Referenced by lpAlgorithm().

lpLexDualSimplex()

static SCIP_RETCODE lpLexDualSimplex ( SCIP_LP *  lp, SCIP_SET *  set, SCIP_STAT *  stat, SCIP_Bool  resolve, SCIP_Bool  keepsol, SCIP_Bool *  lperror  )

static

calls LPI to perform lexicographic dual simplex to find a lexicographically minimal optimal solution, measures time and counts iterations

We follow the approach of the following paper to find a lexicographically minimal optimal solution:

Zanette, Fischetti, Balas
Can pure cutting plane algorithms work?
IPCO 2008, Bertinoro, Italy.

We do, however, not aim for the exact lexicographically minimal optimal solutions, but perform a heuristic, i.e., we limit the number of components which are minimized.

More precisely, we first solve the problem with the dual simplex algorithm. Then we fix those nonbasic variables to their current value (i.e., one of the bounds except maybe for free variables) that have nonzero reduced cost. This fixes the objective function value, because only pivots that will not change the objective are allowed afterwards.

Then the not yet fixed variables are considered in turn. If they are at their lower bounds and nonbasic, they are fixed to this bound, since their value cannot be decreased further. Once a candidate is found, we set the objective to minimize this variable. We run the primal simplex algorithm (since the objective is changed the solution is not dual feasible anymore; if variables out of the basis have been fixed to their lower bound, the basis is also not primal feasible anymore). After the optimization, we again fix nonbasic variables that have nonzero reduced cost. We then choose the next variable and iterate.

We stop the process once we do not find candidates or have performed a maximum number of iterations.

Parameters

lp	current LP data
set	global SCIP settings
stat	problem statistics
resolve	is this a resolving call (starting with feasible basis)?
keepsol	should the old LP solution be kept if no iterations were performed?
lperror	pointer to store whether an unresolved LP error occurred

Definition at line 10639 of file lp.c.

References SCIP_Lp::diving, SCIP_Stat::divinglptime, SCIP_Stat::duallptime, FALSE, SCIP_Lp::flushed, SCIP_Lp::lastlpalgo, SCIP_Stat::lexduallptime, SCIP_Stat::lpcount, SCIP_Lp::lpi, SCIP_Lp::lpifromscratch, SCIP_Lp::ncols, SCIP_Stat::ndivinglps, SCIP_Stat::nduallps, SCIP_Lp::nlpicols, SCIP_Lp::nlpirows, SCIP_Stat::nlps, SCIP_Stat::nnodes, SCIP_Lp::nrows, NULL, SCIP_Lp::probing, r, SCIP_BASESTAT_BASIC, SCIP_BASESTAT_LOWER, SCIP_BASESTAT_UPPER, SCIP_BASESTAT_ZERO, SCIP_Bool, SCIP_CALL, SCIP_LPALGO_DUALSIMPLEX, SCIP_LPERROR, SCIP_OKAY, SCIP_Real, SCIPABORT, SCIPclockGetTime(), SCIPclockStart(), SCIPclockStop(), SCIPerrorMessage, SCIPlpGetIterations(), SCIPlpiChgBounds(), SCIPlpiChgObj(), SCIPlpiChgSides(), SCIPlpiGetBase(), SCIPlpiGetBounds(), SCIPlpiGetObj(), SCIPlpiGetSides(), SCIPlpiGetSol(), SCIPlpiIsOptimal(), SCIPlpiSolveDual(), SCIPlpiSolvePrimal(), SCIPsetAllocBufferArray, SCIPsetDebugMsg, SCIPsetFreeBufferArray, SCIPsetIsDualfeasZero(), SCIPsetIsFeasEQ(), SCIPsetIsFeasPositive(), SCIPsetIsFeasZero(), SCIPsetIsInfinity(), SCIPsetIsIntegral(), SCIPstatAdd, SCIPstatIncrement, SCIPstatUpdate, SCIP_Lp::solisbasic, SCIP_Lp::strongbranchprobing, SCIP_Stat::strongbranchtime, TRUE, SCIP_Lp::validfarkaslp, and SCIP_Lp::validsollp.

Referenced by lpAlgorithm().

lpBarrier()

static SCIP_RETCODE lpBarrier ( SCIP_LP *  lp, SCIP_SET *  set, SCIP_STAT *  stat, SCIP_Bool  crossover, SCIP_Bool  keepsol, SCIP_Bool *  lperror  )

static

calls LPI to perform barrier, measures time and counts iterations, gets basis feasibility status

Parameters

lp	current LP data
set	global SCIP settings
stat	problem statistics
crossover	should crossover be performed?
keepsol	should the old LP solution be kept if no iterations were performed?
lperror	pointer to store whether an unresolved LP error occurred

Definition at line 11237 of file lp.c.

References SCIP_Stat::barrierlptime, SCIP_Lp::diving, SCIP_Stat::divinglptime, FALSE, SCIP_Lp::flushed, SCIP_Lp::lastlpalgo, SCIP_Stat::lpcount, SCIP_Lp::lpi, SCIP_Lp::lpibarrierconvtol, SCIP_Lp::lpidualfeastol, SCIP_Lp::lpifastmip, SCIP_Lp::lpifeastol, SCIP_Lp::lpifromscratch, SCIP_Lp::lpiobjlim, SCIP_Lp::lpipresolving, SCIP_Lp::lpiscaling, SCIP_Stat::nbarrierlps, SCIP_Lp::ncols, SCIP_Stat::ndivinglps, SCIP_Stat::nlps, SCIP_Stat::nnodes, SCIP_Lp::nrows, NULL, SCIP_Lp::probing, SCIP_CALL, SCIP_LPALGO_BARRIER, SCIP_LPALGO_BARRIERCROSSOVER, SCIP_LPERROR, SCIP_MAXSTRLEN, SCIP_OKAY, SCIP_Real, SCIPclockGetTime(), SCIPclockStart(), SCIPclockStop(), SCIPlpGetIterations(), SCIPlpiSolveBarrier(), SCIPlpWrite(), SCIPsetDebugMsg, SCIPsnprintf(), SCIPstatAdd, SCIPstatIncrement, SCIPstatUpdate, SCIP_Lp::solisbasic, SCIP_Lp::strongbranchprobing, SCIP_Stat::strongbranchtime, TRUE, SCIP_Lp::validfarkaslp, and SCIP_Lp::validsollp.

Referenced by lpAlgorithm().

lpAlgorithm()

static SCIP_RETCODE lpAlgorithm ( SCIP_LP *  lp, SCIP_SET *  set, SCIP_STAT *  stat, SCIP_LPALGO  lpalgo, SCIP_Bool  resolve, SCIP_Bool  keepsol, SCIP_Bool  instable, SCIP_Bool *  timelimit, SCIP_Bool *  lperror  )

static

solves the LP with the given algorithm

Parameters

lp	current LP data
set	global SCIP settings
stat	problem statistics
lpalgo	LP algorithm that should be applied
resolve	is this a resolving call (starting with feasible basis)?
keepsol	should the old LP solution be kept if no iterations were performed?
instable	is this a resolving call to avoid instable LPs?
timelimit	pointer to store whether the time limit was hit
lperror	pointer to store whether an unresolved LP error occurred

Definition at line 11374 of file lp.c.

References SCIP_Lp::dualfeasible, FALSE, SCIP_Lp::flushed, SCIP_Lp::installing, lpalgoName(), lpBarrier(), lpDualSimplex(), SCIP_Lp::lpi, lpLexDualSimplex(), lpPrimalSimplex(), lpSetRealpar(), SCIP_Stat::maxdepth, NULL, SCIP_Lp::primalfeasible, SCIP_Bool, SCIP_CALL, SCIP_INVALIDDATA, SCIP_LPALGO_BARRIER, SCIP_LPALGO_BARRIERCROSSOVER, SCIP_LPALGO_DUALSIMPLEX, SCIP_LPALGO_PRIMALSIMPLEX, SCIP_LPPAR_LPTILIM, SCIP_OKAY, SCIP_Real, SCIPclockGetTime(), SCIPerrorMessage, SCIPlpiGetSolFeasibility(), SCIPlpiInfinity(), SCIPsetDebugMsg, SCIP_Stat::solvingtime, and TRUE.

Referenced by lpSolveStable().

lpNumericalTroubleMessage()

static void lpNumericalTroubleMessage ( SCIP_MESSAGEHDLR *  messagehdlr, SCIP_SET *  set, SCIP_STAT *  stat, SCIP_VERBLEVEL  verblevel, const char *  formatstr,   ...  )

static

prints message about numerical trouble

If message has verblevel at most high and display/verblevel is not full, then the message is not printed if already MAXNUMTROUBLELPMSGS messages were printed before in the current run.

Parameters

messagehdlr	message handler
set	global SCIP settings
stat	problem statistics
verblevel	verbosity level of message
formatstr	message format string

Definition at line 11466 of file lp.c.

References MAXNUMTROUBLELPMSGS, SCIP_Stat::nlps, SCIP_Stat::nnodes, SCIP_Stat::nnumtroublelpmsgs, NULL, SCIP_VERBLEVEL_FULL, SCIP_VERBLEVEL_HIGH, SCIP_VERBLEVEL_NONE, SCIPmessagePrintInfo(), and SCIPmessageVFPrintInfo().

Referenced by ignoreInstability(), lpSolveStable(), SCIPlpEndDive(), and SCIPlpSolveAndEval().

ignoreInstability()

static SCIP_RETCODE ignoreInstability ( SCIP_LP *  lp, SCIP_SET *  set, SCIP_MESSAGEHDLR *  messagehdlr, SCIP_STAT *  stat, SCIP_LPALGO  lpalgo, SCIP_Bool *  success  )

static

Parameters

lp	current LP data
set	global SCIP settings
messagehdlr	message handler
stat	problem statistics
lpalgo	LP algorithm that should be applied
success	was instability successfully ignored

Definition at line 11519 of file lp.c.

References SCIP_Lp::dualfeasible, lpalgoName(), SCIP_Lp::lpi, lpNumericalTroubleMessage(), NULL, SCIP_Lp::primalchecked, SCIP_CALL, SCIP_OKAY, SCIP_VERBLEVEL_FULL, SCIPlpiIgnoreInstability(), and TRUE.

Referenced by lpSolveStable().

lpSolveStable()

static SCIP_RETCODE lpSolveStable ( SCIP_LP *  lp, SCIP_SET *  set, SCIP_MESSAGEHDLR *  messagehdlr, SCIP_STAT *  stat, SCIP_PROB *  prob, SCIP_LPALGO  lpalgo, int  itlim, int  harditlim, SCIP_Bool  resolve, int  fastmip, SCIP_Bool  tightprimfeastol, SCIP_Bool  tightdualfeastol, SCIP_Bool  fromscratch, SCIP_Bool  keepsol, SCIP_Bool *  timelimit, SCIP_Bool *  lperror  )

static

solves the LP with the given LP algorithm, and tries to resolve numerical problems

Parameters

lp	current LP data
set	global SCIP settings
messagehdlr	message handler
stat	problem statistics
prob	problem data
lpalgo	LP algorithm that should be applied
itlim	maximal number of LP iterations to perform in first LP calls (before solving from scratch), or -1 for no limit
harditlim	maximal number of LP iterations to perform (hard limit for all LP calls), or -1 for no limit
resolve	is this a resolving call (starting with feasible basis)?
fastmip	which FASTMIP setting of LP solver should be used?
tightprimfeastol	should a tighter primal feasibility tolerance be used?
tightdualfeastol	should a tighter dual feasibility tolerance be used?
fromscratch	should the LP be solved from scratch without using current basis?
keepsol	should the old LP solution be kept if no iterations were performed?
timelimit	pointer to store whether the time limit was hit
lperror	pointer to store whether an unresolved LP error occurred

Definition at line 11548 of file lp.c.

References SCIP_Lp::cutoffbound, SCIP_Lp::diving, FALSE, SCIP_Lp::feastol, FEASTOLTIGHTFAC, SCIP_Lp::flushed, getFiniteLooseObjval(), ignoreInstability(), SCIP_Lp::looseobjvalinf, lpalgoName(), lpAlgorithm(), lpCopyIntegrality(), SCIP_Lp::lpi, SCIP_Lp::lpihaspolishing, lpNumericalTroubleMessage(), lpSetBarrierconvtol(), lpSetConditionLimit(), lpSetDualfeastol(), lpSetFastmip(), lpSetFeastol(), lpSetFromscratch(), lpSetIterationLimit(), lpSetLPInfo(), lpSetMarkowitz(), lpSetObjlim(), lpSetPresolving(), lpSetPricingChar(), lpSetRandomseed(), lpSetRefactorInterval(), lpSetRowrepswitch(), lpSetScaling(), lpSetSolutionPolishing(), lpSetThreads(), lpSetTiming(), SCIP_Stat::nnodes, NULL, SCIP_Lp::probing, SCIP_Bool, SCIP_CALL, SCIP_ERROR, SCIP_LPALGO_DUALSIMPLEX, SCIP_LPALGO_PRIMALSIMPLEX, SCIP_OKAY, SCIP_UNUSED, SCIP_VERBLEVEL_FULL, SCIP_VERBLEVEL_HIGH, SCIPerrorMessage, SCIPlpiIsIterlimExc(), SCIPlpiIsStable(), SCIPsetBarrierconvtol(), SCIPsetDualfeastol(), SCIPsetInitializeRandomSeed(), SCIPsetIsInfinity(), SCIP_Lp::strongbranchprobing, TRUE, and SCIP_Lp::updateintegrality.

Referenced by lpSolve().

adjustLPobjval()

static void adjustLPobjval ( SCIP_LP *  lp, SCIP_SET *  set, SCIP_MESSAGEHDLR *  messagehdlr  )

static

adjust the LP objective value if it is greater/less than +/- SCIPsetInfinity()

Parameters

lp	current LP data
set	global SCIP settings
messagehdlr	message handler

Definition at line 11963 of file lp.c.

References SCIP_Lp::adjustlpval, SCIP_Lp::lpobjval, NULL, SCIPmessagePrintWarning(), SCIPsetInfinity(), SCIPsetIsInfinity(), and TRUE.

Referenced by lpSolve().

lpSolve()

static SCIP_RETCODE lpSolve ( SCIP_LP *  lp, SCIP_SET *  set, SCIP_MESSAGEHDLR *  messagehdlr, SCIP_STAT *  stat, SCIP_PROB *  prob, SCIP_LPALGO  lpalgo, int  resolveitlim, int  harditlim, SCIP_Bool  needprimalray, SCIP_Bool  needdualray, SCIP_Bool  resolve, int  fastmip, SCIP_Bool  tightprimfeastol, SCIP_Bool  tightdualfeastol, SCIP_Bool  fromscratch, SCIP_Bool  keepsol, SCIP_Bool *  lperror  )

static

solves the LP with the given algorithm and evaluates return status

Parameters

lp	current LP data
set	global SCIP settings
messagehdlr	message handler
stat	problem statistics
prob	problem data
lpalgo	LP algorithm that should be applied
resolveitlim	maximal number of LP iterations to perform in resolving calls, or -1 for no limit
harditlim	maximal number of LP iterations to perform (hard limit for all LP calls), or -1 for no limit
needprimalray	if the LP is unbounded, do we need a primal ray?
needdualray	if the LP is infeasible, do we need a dual ray?
resolve	is this a resolving call (starting with feasible basis)?
fastmip	which FASTMIP setting of LP solver should be used?
tightprimfeastol	should a tighter primal feasibility tolerance be used?
tightdualfeastol	should a tighter dual feasibility tolerance be used?
fromscratch	should the LP be solved from scratch without using current basis?
keepsol	should the old LP solution be kept if no iterations were performed?
lperror	pointer to store whether an unresolved LP error occurred

Definition at line 11994 of file lp.c.

References adjustLPobjval(), checkLinks, SCIP_Lp::cutoffbound, SCIP_Lp::dualfeasible, FALSE, SCIP_Lp::flushed, getFiniteLooseObjval(), SCIP_Lp::lastlpalgo, lpalgoName(), lpCutoffDisabled, SCIP_Lp::lpi, SCIP_Lp::lpiobjlim, SCIP_Lp::lpobjval, SCIP_Lp::lpsolstat, lpSolveStable(), SCIP_Stat::nlps, SCIP_Stat::nnodes, NULL, SCIP_Lp::primalfeasible, REALABS, SCIP_Bool, SCIP_CALL, SCIP_LPALGO_DUALSIMPLEX, SCIP_LPALGO_PRIMALSIMPLEX, SCIP_LPERROR, SCIP_LPSOLSTAT_ERROR, SCIP_LPSOLSTAT_INFEASIBLE, SCIP_LPSOLSTAT_ITERLIMIT, SCIP_LPSOLSTAT_NOTSOLVED, SCIP_LPSOLSTAT_OBJLIMIT, SCIP_LPSOLSTAT_OPTIMAL, SCIP_LPSOLSTAT_TIMELIMIT, SCIP_LPSOLSTAT_UNBOUNDEDRAY, SCIP_OKAY, SCIP_VERBLEVEL_FULL, SCIPerrorMessage, SCIPlpiExistsPrimalRay(), SCIPlpiGetInternalStatus(), SCIPlpiGetObjval(), SCIPlpiHasDualRay(), SCIPlpiInfinity(), SCIPlpiIsDualFeasible(), SCIPlpiIsIterlimExc(), SCIPlpiIsObjlimExc(), SCIPlpiIsOptimal(), SCIPlpiIsPrimalFeasible(), SCIPlpiIsPrimalInfeasible(), SCIPlpiIsPrimalUnbounded(), SCIPlpiIsTimelimExc(), SCIPmessagePrintVerbInfo(), SCIPsetDebugMsg, SCIPsetInfinity(), SCIPsetIsGE(), SCIPsetIsInfinity(), SCIPsetIsLE(), SCIP_Lp::solved, and TRUE.

Referenced by lpFlushAndSolve(), and SCIPlpSolveAndEval().

lpFlushAndSolve()

static SCIP_RETCODE lpFlushAndSolve ( SCIP_LP *  lp, BMS_BLKMEM *  blkmem, SCIP_SET *  set, SCIP_MESSAGEHDLR *  messagehdlr, SCIP_STAT *  stat, SCIP_PROB *  prob, SCIP_EVENTQUEUE *  eventqueue, int  resolveitlim, int  harditlim, SCIP_Bool  needprimalray, SCIP_Bool  needdualray, int  fastmip, SCIP_Bool  tightprimfeastol, SCIP_Bool  tightdualfeastol, SCIP_Bool  fromscratch, SCIP_Bool  keepsol, SCIP_Bool *  lperror  )

static

flushes the LP and solves it with the primal or dual simplex algorithm, depending on the current basis feasibility

Parameters

lp	current LP data
blkmem	block memory
set	global SCIP settings
messagehdlr	message handler
stat	problem statistics
prob	problem data
eventqueue	event queue
resolveitlim	maximal number of LP iterations to perform in resolving calls, or -1 for no limit
harditlim	maximal number of LP iterations to perform (hard limit for all LP calls), or -1 for no limit
needprimalray	if the LP is unbounded, do we need a primal ray?
needdualray	if the LP is infeasible, do we need a dual ray?
fastmip	which FASTMIP setting of LP solver should be used?
tightprimfeastol	should a tighter primal feasibility tolerance be used?
tightdualfeastol	should a tighter dual feasibility tolerance be used?
fromscratch	should the LP be solved from scratch without using current basis?
keepsol	should the old LP solution be kept if no iterations were performed?
lperror	pointer to store whether an unresolved LP error occurred

Definition at line 12173 of file lp.c.

References SCIP_Lp::dualfeasible, SCIP_Lp::flushaddedcols, SCIP_Lp::flushdeletedcols, lpSolve(), NULL, SCIP_Lp::primalfeasible, SCIP_Bool, SCIP_CALL, SCIP_LPALGO_BARRIER, SCIP_LPALGO_BARRIERCROSSOVER, SCIP_LPALGO_DUALSIMPLEX, SCIP_LPALGO_PRIMALSIMPLEX, SCIP_OKAY, SCIP_PARAMETERWRONGVAL, SCIPerrorMessage, SCIPlpFlush(), SCIPsetDebugMsg, SCIP_Lp::solisbasic, and SCIP_Lp::solved.

Referenced by SCIPlpSolveAndEval().

checkLazyBounds()

static void checkLazyBounds ( SCIP_LP *  lp, SCIP_SET *  set  )

static

checks if the lazy bounds are valid

Parameters

lp	LP data
set	global SCIP settings

Definition at line 12262 of file lp.c.

References SCIP_Lp::flushed, SCIP_Lp::lazycols, SCIP_Col::lazylb, SCIP_Col::lazyub, SCIP_Lp::nlazycols, SCIP_Col::primsol, SCIPsetIsFeasGE(), SCIPsetIsFeasLE(), and SCIPsetIsInfinity().

Referenced by SCIPlpSolveAndEval().

updateLazyBounds()

static SCIP_RETCODE updateLazyBounds ( SCIP_LP *  lp, SCIP_SET *  set  )

static

marks all lazy columns to be changed; this is needed for reloading/removing bounds of these columns before and after diving

Parameters

lp	LP data
set	global SCIP settings

Definition at line 12289 of file lp.c.

References SCIP_Lp::diving, SCIP_Lp::divinglazyapplied, SCIP_Col::flushedlb, SCIP_Col::flushedub, insertColChgcols(), SCIP_Lp::lazycols, SCIP_Col::lazylb, SCIP_Col::lazyub, SCIP_Col::lb, SCIP_Col::lbchanged, SCIP_Lp::lpi, SCIP_Lp::nlazycols, SCIP_CALL, SCIP_OKAY, SCIPlpiInfinity(), SCIPsetDebugMsg, SCIPsetIsGT(), SCIPsetIsInfinity(), SCIPsetIsLT(), TRUE, SCIP_Col::ub, and SCIP_Col::ubchanged.

Referenced by SCIPlpEndDive(), and SCIPlpSolveAndEval().

lpGetResolveItlim()

static int lpGetResolveItlim ( SCIP_SET *  set, SCIP_STAT *  stat, int  itlim  )

static

returns the iteration limit for an LP resolving call

Parameters

set	global SCIP settings
stat	dynamic problem statistics
itlim	hard iteration limit

Definition at line 12351 of file lp.c.

References MAX, SCIP_Stat::nlpiterations, SCIP_Stat::nlps, SCIP_Stat::nrootlpiterations, SCIP_Stat::nrootlps, and SCIP_Real.

Referenced by SCIPlpSolveAndEval().

SCIPlpSolveAndEval()

SCIP_RETCODE SCIPlpSolveAndEval	(	SCIP_LP *	lp,
		SCIP_SET *	set,
		SCIP_MESSAGEHDLR *	messagehdlr,
		BMS_BLKMEM *	blkmem,
		SCIP_STAT *	stat,
		SCIP_EVENTQUEUE *	eventqueue,
		SCIP_EVENTFILTER *	eventfilter,
		SCIP_PROB *	prob,
		SCIP_Longint	itlim,
		SCIP_Bool	limitresolveiters,
		SCIP_Bool	aging,
		SCIP_Bool	keepsol,
		SCIP_Bool *	lperror
	)

solves the LP with simplex algorithm, and copy the solution into the column's data

Parameters

lp	LP data
set	global SCIP settings
messagehdlr	message handler
blkmem	block memory buffers
stat	problem statistics
eventqueue	event queue
eventfilter	global event filter
prob	problem data
itlim	maximal number of LP iterations to perform, or -1 for no limit
limitresolveiters	should LP iterations for resolving calls be limited? (limit is computed within the method w.r.t. the average LP iterations)
aging	should aging and removal of obsolete cols/rows be applied?
keepsol	should the old LP solution be kept if no iterations were performed?
lperror	pointer to store whether an unresolved LP error occurred

Definition at line 12371 of file lp.c.

References checkLazyBounds(), SCIP_Lp::cutoffbound, SCIP_Lp::diving, SCIP_Lp::divinglazyapplied, SCIP_Lp::dualchecked, SCIP_Lp::dualfeasible, FALSE, SCIP_Lp::flushaddedcols, SCIP_Lp::flushdeletedcols, SCIP_Lp::flushed, getFiniteLooseObjval(), SCIP_Lp::lastlpalgo, lpCutoffDisabled, lpFlushAndSolve(), lpGetResolveItlim(), SCIP_Lp::lpi, SCIP_Lp::lpifromscratch, SCIP_Lp::lpihasfastmip, SCIP_Lp::lpiobjlim, lpNumericalTroubleMessage(), SCIP_Lp::lpobjval, lpSetFromscratch(), SCIP_Lp::lpsolstat, lpSolve(), SCIP_Stat::nclockskipsleft, SCIP_Lp::ncols, SCIP_Lp::nlazycols, SCIP_Stat::nlps, SCIP_Stat::nnodes, SCIP_Lp::nrows, NULL, SCIP_Prob::nvars, SCIP_Lp::primalchecked, SCIP_Lp::primalfeasible, SCIP_Lp::probing, SCIP_Bool, SCIP_CALL, SCIP_ERROR, SCIP_Longint, SCIP_LPALGO_DUALSIMPLEX, SCIP_LPALGO_PRIMALSIMPLEX, SCIP_LPERROR, SCIP_LPSOLSTAT_ERROR, SCIP_LPSOLSTAT_INFEASIBLE, SCIP_LPSOLSTAT_ITERLIMIT, SCIP_LPSOLSTAT_NOTSOLVED, SCIP_LPSOLSTAT_OBJLIMIT, SCIP_LPSOLSTAT_OPTIMAL, SCIP_LPSOLSTAT_TIMELIMIT, SCIP_LPSOLSTAT_UNBOUNDEDRAY, SCIP_OKAY, SCIP_Real, SCIP_STATUS_TIMELIMIT, SCIP_UNUSED, SCIP_VERBLEVEL_FULL, SCIP_VERBLEVEL_HIGH, SCIPerrorMessage, SCIPlpFlush(), SCIPlpGetDualfarkas(), SCIPlpGetLPI(), SCIPlpGetSol(), SCIPlpGetSolstat(), SCIPlpGetUnboundedSol(), SCIPlpiGetObjval(), SCIPlpiHasDualRay(), SCIPlpiInfinity(), SCIPlpiIsObjlimExc(), SCIPlpRemoveNewObsoletes(), SCIPlpUpdateAges(), SCIPmessagePrintVerbInfo(), SCIPmessagePrintWarning(), SCIPprobAllColsInLP(), SCIPsetDebugMsg, SCIPsetGetCharParam(), SCIPsetInfinity(), SCIPsetIsFeasNegative(), SCIPsetIsGE(), SCIPsetIsLT(), SCIPsetSetCharParam(), SCIPsolveIsStopped(), SCIP_Lp::solved, SCIP_Stat::status, TRUE, and updateLazyBounds().

Referenced by focusnodeToFork(), priceAndCutLoop(), SCIPlpEndDive(), SCIPpriceLoop(), SCIPsolveDiveLP(), SCIPtreeEndProbing(), separationRoundResolveLP(), solveNodeInitialLP(), solveNodeLP(), and solveProbingLP().

SCIPlpGetSolstat()

SCIP_LPSOLSTAT SCIPlpGetSolstat

(

SCIP_LP *

lp

)

gets solution status of current LP

Parameters

lp	current LP data

Definition at line 13047 of file lp.c.

References SCIP_Lp::flushed, SCIP_Lp::lpsolstat, NULL, SCIP_LPSOLSTAT_NOTSOLVED, and SCIP_Lp::solved.

Referenced by branchcandCalcLPCands(), conflictAnalyzeBoundexceedingLP(), conflictAnalyzeInfeasibleLP(), enforceConstraints(), focusnodeToFork(), forkCreate(), forkFree(), nodeToLeaf(), priceAndCutLoop(), propAndSolve(), SCIPconflictAnalyzeLP(), SCIPcutpoolAddNewRow(), SCIPgetLPBranchCands(), SCIPgetLPSolstat(), SCIPgetNLPBranchCands(), SCIPgetNPrioLPBranchCands(), SCIPlpCleanupAll(), SCIPlpCleanupNew(), SCIPlpEndDive(), SCIPlpGetDegeneracy(), SCIPlpGetSol(), SCIPlpRemoveAllObsoletes(), SCIPlpRemoveNewObsoletes(), SCIPlpSetCutoffbound(), SCIPlpSolveAndEval(), SCIPlpStartDive(), SCIPnodeCutoff(), SCIPnodeFocus(), SCIPnodepqBound(), SCIPpriceLoop(), SCIPpricerExec(), SCIPpricestoreAddProbVars(), SCIPprobUpdateBestRootSol(), SCIPreoptCheckCutoff(), SCIPsolveCIP(), SCIPsolveDiveLP(), SCIPtreeCutoff(), SCIPtreeEndProbing(), SCIPtreeStartProbing(), separationRoundLP(), solveNode(), solveNodeInitialLP(), solveNodeLP(), solveProbingLP(), updateEstimate(), updatePrimalRay(), and updatePseudocost().

SCIPlpGetObjval()

SCIP_Real SCIPlpGetObjval	(	SCIP_LP *	lp,
		SCIP_SET *	set,
		SCIP_PROB *	prob
	)

gets objective value of current LP

Note

This method returns the objective value of the current LP solution, which might be primal or dual infeasible if a limit was hit during solving. It must not be used as a dual bound if the LP solution status is SCIP_LPSOLSTAT_ITERLIMIT or SCIP_LPSOLSTAT_TIMELIMIT.

Parameters

lp	current LP data
set	global SCIP settings
prob	problem data

Definition at line 13063 of file lp.c.

References SCIP_Lp::flushed, SCIP_Lp::looseobjval, SCIP_Lp::looseobjvalid, SCIP_Lp::looseobjvalinf, SCIP_Lp::lpobjval, SCIP_Lp::nloosevars, NULL, recomputeLooseObjectiveValue(), SCIP_INVALID, SCIPsetInfinity(), SCIPsetIsInfinity(), and SCIP_Lp::solved.

Referenced by addCurrentSolution(), analyzeStrongbranch(), enforceConstraints(), forkCreate(), forkFree(), priceAndCutLoop(), propAndSolve(), SCIPcolGetStrongbranch(), SCIPcolGetStrongbranches(), SCIPgetLPObjval(), SCIPgetSolOrigObj(), SCIPgetSolTransObj(), SCIPlpSetCutoffbound(), SCIPnodeUpdateLowerboundLP(), SCIPprobUpdateBestRootSol(), SCIPsolLinkLPSol(), SCIPsolveCIP(), solveNode(), solveNodeInitialLP(), solveNodeLP(), and updatePseudocost().

SCIPlpGetColumnObjval()

SCIP_Real SCIPlpGetColumnObjval

(

SCIP_LP *

lp

)

gets part of objective value of current LP that results from COLUMN variables only

Parameters

lp	current LP data

Definition at line 13091 of file lp.c.

References SCIP_Lp::flushed, SCIP_Lp::lpobjval, NULL, SCIP_INVALID, and SCIP_Lp::solved.

Referenced by SCIPgetLPColumnObjval(), SCIPlpStoreRootObjval(), and SCIPprobStoreRootSol().

SCIPlpGetLooseObjval()

SCIP_Real SCIPlpGetLooseObjval	(	SCIP_LP *	lp,
		SCIP_SET *	set,
		SCIP_PROB *	prob
	)

gets part of objective value of current LP that results from LOOSE variables only

Parameters

lp	current LP data
set	global SCIP settings
prob	problem data

Definition at line 13102 of file lp.c.

References SCIP_Lp::flushed, getFiniteLooseObjval(), SCIP_Lp::looseobjval, SCIP_Lp::looseobjvalinf, SCIP_Lp::nloosevars, NULL, SCIP_INVALID, SCIPsetInfinity(), and SCIP_Lp::solved.

Referenced by performStrongbranchWithPropagation(), SCIPgetLPLooseObjval(), SCIPlpStoreRootObjval(), and SCIPsolLinkLPSol().

SCIPlpStoreRootObjval()

void SCIPlpStoreRootObjval	(	SCIP_LP *	lp,
		SCIP_SET *	set,
		SCIP_PROB *	prob
	)

remembers the current LP objective value as root solution value

Parameters

lp	current LP data
set	global SCIP settings
prob	problem data

Definition at line 13122 of file lp.c.

References NULL, SCIP_Lp::rootlooseobjval, SCIP_Lp::rootlpobjval, SCIPlpGetColumnObjval(), and SCIPlpGetLooseObjval().

Referenced by SCIPprobStoreRootSol().

SCIPlpInvalidateRootObjval()

void SCIPlpInvalidateRootObjval

(

SCIP_LP *

lp

)

invalidates the root LP solution value

Parameters

lp	current LP data

Definition at line 13135 of file lp.c.

References NULL, SCIP_Lp::rootlooseobjval, SCIP_Lp::rootlpobjval, and SCIP_INVALID.

Referenced by freeReoptSolve(), and freeSolve().

SCIPlpRecomputeLocalAndGlobalPseudoObjval()

void SCIPlpRecomputeLocalAndGlobalPseudoObjval	(	SCIP_LP *	lp,
		SCIP_SET *	set,
		SCIP_PROB *	prob
	)

recomputes local and global pseudo objective values

Parameters

lp	current LP data
set	global SCIP settings
prob	problem data

Definition at line 13146 of file lp.c.

References SCIP_Lp::glbpseudoobjval, SCIP_Lp::glbpseudoobjvalid, SCIP_Lp::glbpseudoobjvalinf, NULL, SCIP_Prob::nvars, SCIP_Lp::pseudoobjval, SCIP_Lp::pseudoobjvalid, SCIP_Lp::pseudoobjvalinf, SCIP_Lp::relglbpseudoobjval, SCIP_Lp::relpseudoobjval, SCIP_Real, SCIPsetIsInfinity(), SCIPsetIsNegative(), SCIPsetIsPositive(), SCIPvarGetLbGlobal(), SCIPvarGetLbLocal(), SCIPvarGetObj(), SCIPvarGetUbGlobal(), SCIPvarGetUbLocal(), TRUE, and SCIP_Prob::vars.

Referenced by prepareReoptimization(), and treeBacktrackProbing().

SCIPlpGetGlobalPseudoObjval()

SCIP_Real SCIPlpGetGlobalPseudoObjval	(	SCIP_LP *	lp,
		SCIP_SET *	set,
		SCIP_PROB *	prob
	)

gets the global pseudo objective value; that is all variables set to their best (w.r.t. the objective function) global bound

Parameters

lp	current LP data
set	global SCIP settings
prob	problem data

Definition at line 13214 of file lp.c.

References SCIP_Lp::glbpseudoobjval, SCIP_Lp::glbpseudoobjvalid, SCIP_Lp::glbpseudoobjvalinf, NULL, recomputeGlbPseudoObjectiveValue(), SCIPsetInfinity(), and SCIPsetIsInfinity().

Referenced by SCIPgetGlobalPseudoObjval(), and solveNode().

SCIPlpGetPseudoObjval()

SCIP_Real SCIPlpGetPseudoObjval	(	SCIP_LP *	lp,
		SCIP_SET *	set,
		SCIP_PROB *	prob
	)

gets the pseudo objective value for the current search node; that is all variables set to their best (w.r.t. the objective function) local bound

Parameters

lp	current LP data
set	global SCIP settings
prob	problem data

Definition at line 13246 of file lp.c.

References NULL, SCIP_Lp::pseudoobjval, SCIP_Lp::pseudoobjvalid, SCIP_Lp::pseudoobjvalinf, recomputePseudoObjectiveValue(), SCIPsetInfinity(), and SCIPsetIsInfinity().

Referenced by applyBounding(), enforceConstraints(), SCIPconflictAnalyzePseudo(), SCIPgetPseudoObjval(), SCIPgetSolOrigObj(), SCIPgetSolTransObj(), SCIPprimalHeuristics(), SCIPsolLinkPseudoSol(), and solveNode().

SCIPlpGetModifiedPseudoObjval()

SCIP_Real SCIPlpGetModifiedPseudoObjval	(	SCIP_LP *	lp,
		SCIP_SET *	set,
		SCIP_PROB *	prob,
		SCIP_VAR *	var,
		SCIP_Real	oldbound,
		SCIP_Real	newbound,
		SCIP_BOUNDTYPE	boundtype
	)

gets pseudo objective value, if a bound of the given variable would be modified in the given way

Parameters

lp	current LP data
set	global SCIP settings
prob	problem data
var	problem variable
oldbound	old value for bound
newbound	new value for bound
boundtype	type of bound: lower or upper bound

Definition at line 13276 of file lp.c.

References getFinitePseudoObjval(), SCIP_Lp::pseudoobjvalinf, REALABS, SCIP_Real, SCIPsetInfinity(), SCIPsetIsInfinity(), SCIPsetIsZero(), SCIPvarGetBestBoundType(), and SCIPvarGetObj().

Referenced by SCIPnodeAddBoundinfer().

SCIPlpGetModifiedProvedPseudoObjval()

SCIP_Real SCIPlpGetModifiedProvedPseudoObjval	(	SCIP_LP *	lp,
		SCIP_SET *	set,
		SCIP_VAR *	var,
		SCIP_Real	oldbound,
		SCIP_Real	newbound,
		SCIP_BOUNDTYPE	boundtype
	)

gets pseudo objective value, if a bound of the given variable would be modified in the given way; perform calculations with interval arithmetic to get an exact lower bound

Parameters

lp	current LP data
set	global SCIP settings
var	problem variable
oldbound	old value for bound
newbound	new value for bound
boundtype	type of bound: lower or upper bound

Definition at line 13316 of file lp.c.

References SCIP_Lp::pseudoobjval, SCIP_Lp::pseudoobjvalid, SCIP_Lp::pseudoobjvalinf, REALABS, SCIP_Real, SCIPintervalAdd(), SCIPintervalGetInf(), SCIPintervalMul(), SCIPintervalSet(), SCIPintervalSub(), SCIPsetInfinity(), SCIPsetIsInfinity(), SCIPsetIsZero(), SCIPvarGetBestBoundType(), and SCIPvarGetObj().

Referenced by SCIPnodeAddBoundinfer().

getObjvalDeltaObj()

static void getObjvalDeltaObj ( SCIP_SET *  set, SCIP_Real  oldobj, SCIP_Real  newobj, SCIP_Real  lb, SCIP_Real  ub, SCIP_Real *  deltaval, int *  deltainf  )

static

compute the objective delta due the new objective coefficient

Parameters

set	global SCIP settings
oldobj	old objective value of variable
newobj	new objective value of variable
lb	lower bound of variable
ub	upper bound of variable
deltaval	pointer to store the delta value
deltainf	pointer to store the number of variables with infinite best bound

Definition at line 13374 of file lp.c.

References REALABS, SCIPsetIsEQ(), SCIPsetIsInfinity(), SCIPsetIsNegative(), and SCIPsetIsPositive().

Referenced by SCIPlpUpdateVarObj().

getObjvalDeltaLb()

static void getObjvalDeltaLb ( SCIP_SET *  set, SCIP_Real  obj, SCIP_Real  oldlb, SCIP_Real  newlb, SCIP_Real *  deltaval, int *  deltainf  )

static

compute the objective delta due the new lower bound

Parameters

set	global SCIP settings
obj	objective value of variable
oldlb	old lower bound of variable
newlb	new lower bound of variable
deltaval	pointer to store the delta value
deltainf	pointer to store the number of variables with infinite best bound

Definition at line 13505 of file lp.c.

References REALABS, SCIPsetIsInfinity(), and SCIPsetIsPositive().

Referenced by SCIPlpUpdateVarLb(), and SCIPlpUpdateVarLbGlobal().

getObjvalDeltaUb()

static void getObjvalDeltaUb ( SCIP_SET *  set, SCIP_Real  obj, SCIP_Real  oldub, SCIP_Real  newub, SCIP_Real *  deltaval, int *  deltainf  )

static

compute the objective delta due the new upper bound

Parameters

set	global SCIP settings
obj	objective value of variable
oldub	old upper bound of variable
newub	new upper bound of variable
deltaval	pointer to store the delta value
deltainf	pointer to store the number of variables with infinite best bound

Definition at line 13546 of file lp.c.

References REALABS, SCIPsetIsInfinity(), and SCIPsetIsNegative().

Referenced by SCIPlpUpdateVarUb(), and SCIPlpUpdateVarUbGlobal().

lpUpdateObjval()

static void lpUpdateObjval ( SCIP_LP *  lp, SCIP_SET *  set, SCIP_VAR *  var, SCIP_Real  deltaval, int  deltainf, SCIP_Bool  local, SCIP_Bool  loose, SCIP_Bool  global  )

static

updates current pseudo and loose objective values for a change in a variable's objective value or bounds

Parameters

lp	current LP data
set	global SCIP settings
var	problem variable that changed
deltaval	delta value in the objective function
deltainf	delta value for the number of variables with infinite best bound
local	should the local pseudo objective value be updated?
loose	should the loose objective value be updated?
global	should the global pseudo objective value be updated?

Definition at line 13587 of file lp.c.

References FALSE, SCIP_Lp::glbpseudoobjval, SCIP_Lp::glbpseudoobjvalid, SCIP_Lp::glbpseudoobjvalinf, SCIP_Lp::looseobjval, SCIP_Lp::looseobjvalid, SCIP_Lp::looseobjvalinf, NULL, SCIP_Lp::pseudoobjval, SCIP_Lp::pseudoobjvalid, SCIP_Lp::pseudoobjvalinf, REALABS, SCIP_Lp::relglbpseudoobjval, SCIP_Lp::rellooseobjval, SCIP_Lp::relpseudoobjval, SCIP_VARSTATUS_LOOSE, SCIPsetIsUpdateUnreliable(), SCIPvarGetStatus(), and TRUE.

Referenced by lpUpdateVarColumn(), lpUpdateVarLoose(), SCIPlpUpdateVarLb(), SCIPlpUpdateVarLbGlobal(), SCIPlpUpdateVarObj(), SCIPlpUpdateVarUb(), and SCIPlpUpdateVarUbGlobal().

lpUpdateVarProved()

static SCIP_RETCODE lpUpdateVarProved ( SCIP_LP *  lp, SCIP_SET *  set, SCIP_VAR *  var, SCIP_Real  oldobj, SCIP_Real  oldlb, SCIP_Real  oldub, SCIP_Real  newobj, SCIP_Real  newlb, SCIP_Real  newub  )

static

updates current pseudo and loose objective values for a change in a variable's objective value or bounds; pseudo objective value is calculated with interval arithmetics to get a proved lower bound

Parameters

lp	current LP data
set	global SCIP settings
var	problem variable that changed
oldobj	old objective value of variable
oldlb	old objective value of variable
oldub	old objective value of variable
newobj	new objective value of variable
newlb	new objective value of variable
newub	new objective value of variable

Definition at line 13669 of file lp.c.

References SCIP_Lp::looseobjval, SCIP_Lp::looseobjvalinf, NULL, SCIP_Lp::pseudoobjval, SCIP_Lp::pseudoobjvalinf, REALABS, SCIP_INVALIDDATA, SCIP_OKAY, SCIP_VARSTATUS_COLUMN, SCIP_VARSTATUS_LOOSE, SCIPerrorMessage, SCIPintervalAdd(), SCIPintervalGetInf(), SCIPintervalMul(), SCIPintervalSet(), SCIPintervalSub(), SCIPsetInfinity(), SCIPsetIsInfinity(), SCIPvarGetProbindex(), and SCIPvarGetStatus().

Referenced by SCIPlpUpdateVarLb(), SCIPlpUpdateVarObj(), and SCIPlpUpdateVarUb().

SCIPlpUpdateVarObj()

SCIP_RETCODE SCIPlpUpdateVarObj	(	SCIP_LP *	lp,
		SCIP_SET *	set,
		SCIP_VAR *	var,
		SCIP_Real	oldobj,
		SCIP_Real	newobj
	)

updates current pseudo and loose objective value for a change in a variable's objective value

Parameters

lp	current LP data
set	global SCIP settings
var	problem variable that changed
oldobj	old objective value of variable
newobj	new objective value of variable

Definition at line 13782 of file lp.c.

References FALSE, getObjvalDeltaObj(), lpUpdateObjval(), lpUpdateVarProved(), NULL, SCIP_Lp::probing, SCIP_CALL, SCIP_OKAY, SCIP_Real, SCIP_VARSTATUS_COLUMN, SCIP_VARSTATUS_LOOSE, SCIPsetIsEQ(), SCIPvarGetLbGlobal(), SCIPvarGetLbLocal(), SCIPvarGetProbindex(), SCIPvarGetStatus(), SCIPvarGetUbGlobal(), SCIPvarGetUbLocal(), and TRUE.

Referenced by SCIPeventProcess(), SCIPlpUpdateAddVar(), and SCIPlpUpdateDelVar().

SCIPlpUpdateVarLbGlobal()

SCIP_RETCODE SCIPlpUpdateVarLbGlobal	(	SCIP_LP *	lp,
		SCIP_SET *	set,
		SCIP_VAR *	var,
		SCIP_Real	oldlb,
		SCIP_Real	newlb
	)

updates current root pseudo objective value for a global change in a variable's lower bound

Parameters

lp	current LP data
set	global SCIP settings
var	problem variable that changed
oldlb	old lower bound of variable
newlb	new lower bound of variable

Definition at line 13836 of file lp.c.

References FALSE, getObjvalDeltaLb(), lpUpdateObjval(), NULL, SCIP_OKAY, SCIP_Real, SCIPsetIsEQ(), SCIPsetIsPositive(), SCIPvarGetObj(), and TRUE.

Referenced by SCIPeventProcess().

SCIPlpUpdateVarLb()

SCIP_RETCODE SCIPlpUpdateVarLb	(	SCIP_LP *	lp,
		SCIP_SET *	set,
		SCIP_VAR *	var,
		SCIP_Real	oldlb,
		SCIP_Real	newlb
	)

updates current pseudo and loose objective value for a change in a variable's lower bound

Parameters

lp	current LP data
set	global SCIP settings
var	problem variable that changed
oldlb	old lower bound of variable
newlb	new lower bound of variable

Definition at line 13863 of file lp.c.

References FALSE, getObjvalDeltaLb(), lpUpdateObjval(), lpUpdateVarProved(), NULL, SCIP_CALL, SCIP_OKAY, SCIP_Real, SCIP_VARSTATUS_COLUMN, SCIP_VARSTATUS_LOOSE, SCIPsetIsEQ(), SCIPsetIsPositive(), SCIPvarGetObj(), SCIPvarGetProbindex(), SCIPvarGetStatus(), SCIPvarGetUbLocal(), and TRUE.

Referenced by SCIPeventProcess().

SCIPlpUpdateVarUbGlobal()

SCIP_RETCODE SCIPlpUpdateVarUbGlobal	(	SCIP_LP *	lp,
		SCIP_SET *	set,
		SCIP_VAR *	var,
		SCIP_Real	oldub,
		SCIP_Real	newub
	)

updates current root pseudo objective value for a global change in a variable's upper bound

Parameters

lp	current LP data
set	global SCIP settings
var	problem variable that changed
oldub	old upper bound of variable
newub	new upper bound of variable

Definition at line 13904 of file lp.c.

References FALSE, getObjvalDeltaUb(), lpUpdateObjval(), NULL, SCIP_OKAY, SCIP_Real, SCIPsetIsEQ(), SCIPsetIsNegative(), SCIPvarGetObj(), and TRUE.

Referenced by SCIPeventProcess().

SCIPlpUpdateVarUb()

SCIP_RETCODE SCIPlpUpdateVarUb	(	SCIP_LP *	lp,
		SCIP_SET *	set,
		SCIP_VAR *	var,
		SCIP_Real	oldub,
		SCIP_Real	newub
	)

updates current pseudo objective value for a change in a variable's upper bound

Parameters

lp	current LP data
set	global SCIP settings
var	problem variable that changed
oldub	old upper bound of variable
newub	new upper bound of variable

Definition at line 13931 of file lp.c.

References FALSE, getObjvalDeltaUb(), lpUpdateObjval(), lpUpdateVarProved(), NULL, SCIP_CALL, SCIP_OKAY, SCIP_Real, SCIP_VARSTATUS_COLUMN, SCIP_VARSTATUS_LOOSE, SCIPsetIsEQ(), SCIPsetIsNegative(), SCIPvarGetLbLocal(), SCIPvarGetObj(), SCIPvarGetProbindex(), SCIPvarGetStatus(), and TRUE.

Referenced by SCIPeventProcess().

SCIPlpUpdateAddVar()

SCIP_RETCODE SCIPlpUpdateAddVar	(	SCIP_LP *	lp,
		SCIP_SET *	set,
		SCIP_VAR *	var
	)

informs LP, that given variable was added to the problem

Parameters

lp	current LP data
set	global SCIP settings
var	variable that is now a LOOSE problem variable

Definition at line 13972 of file lp.c.

References SCIP_Lp::nloosevars, NULL, SCIP_CALL, SCIP_OKAY, SCIP_VARSTATUS_COLUMN, SCIP_VARSTATUS_LOOSE, SCIPlpUpdateVarObj(), SCIPvarGetObj(), SCIPvarGetProbindex(), and SCIPvarGetStatus().

Referenced by SCIPprobAddVar().

SCIPlpUpdateDelVar()

SCIP_RETCODE SCIPlpUpdateDelVar	(	SCIP_LP *	lp,
		SCIP_SET *	set,
		SCIP_VAR *	var
	)

informs LP, that given variable is to be deleted from the problem

Parameters

lp	current LP data
set	global SCIP settings
var	variable that will be deleted from the problem

Definition at line 13993 of file lp.c.

References NULL, SCIP_CALL, SCIP_OKAY, SCIP_VARSTATUS_COLUMN, SCIP_VARSTATUS_LOOSE, SCIPlpDecNLoosevars(), SCIPlpUpdateVarObj(), SCIPvarGetObj(), SCIPvarGetProbindex(), and SCIPvarGetStatus().

Referenced by SCIPprobPerformVarDeletions().

lpUpdateVarColumn()

static SCIP_RETCODE lpUpdateVarColumn ( SCIP_LP *  lp, SCIP_SET *  set, SCIP_VAR *  var  )

static

informs LP, that given formerly loose problem variable is now a column variable

Parameters

lp	current LP data
set	global SCIP settings
var	problem variable that changed from LOOSE to COLUMN

Definition at line 14017 of file lp.c.

References FALSE, SCIP_Lp::looseobjvalinf, lpUpdateObjval(), SCIP_Lp::nloosevars, NULL, SCIP_OKAY, SCIP_Real, SCIP_VARSTATUS_COLUMN, SCIPlpDecNLoosevars(), SCIPsetIsInfinity(), SCIPsetIsNegative(), SCIPsetIsPositive(), SCIPvarGetLbLocal(), SCIPvarGetObj(), SCIPvarGetProbindex(), SCIPvarGetStatus(), SCIPvarGetUbLocal(), and TRUE.

Referenced by SCIPlpUpdateVarColumn().

lpUpdateVarColumnProved()

static SCIP_RETCODE lpUpdateVarColumnProved ( SCIP_LP *  lp, SCIP_SET *  set, SCIP_VAR *  var  )

static

informs LP, that given formerly loose problem variable is now a column variable pseudo objective value is calculated with interval arithmetics to get a proved lower bound

Parameters

lp	current LP data
set	global SCIP settings
var	problem variable that changed from LOOSE to COLUMN

Definition at line 14064 of file lp.c.

References SCIP_Lp::looseobjval, SCIP_Lp::looseobjvalinf, SCIP_Lp::nloosevars, NULL, SCIP_OKAY, SCIP_Real, SCIP_VARSTATUS_COLUMN, SCIPintervalGetInf(), SCIPintervalMul(), SCIPintervalSet(), SCIPintervalSub(), SCIPsetInfinity(), SCIPsetIsInfinity(), SCIPsetIsNegative(), SCIPvarGetLbLocal(), SCIPvarGetObj(), SCIPvarGetProbindex(), SCIPvarGetStatus(), and SCIPvarGetUbLocal().

Referenced by SCIPlpUpdateVarColumn().

SCIPlpUpdateVarColumn()

SCIP_RETCODE SCIPlpUpdateVarColumn	(	SCIP_LP *	lp,
		SCIP_SET *	set,
		SCIP_VAR *	var
	)

informs LP, that given formerly loose problem variable is now a column variable

Parameters

lp	current LP data
set	global SCIP settings
var	problem variable that changed from LOOSE to COLUMN

Definition at line 14129 of file lp.c.

References lpUpdateVarColumn(), lpUpdateVarColumnProved(), NULL, SCIP_CALL, and SCIP_OKAY.

Referenced by SCIPvarColumn().

lpUpdateVarLoose()

static SCIP_RETCODE lpUpdateVarLoose ( SCIP_LP *  lp, SCIP_SET *  set, SCIP_VAR *  var  )

static

informs LP, that given formerly column problem variable is now again a loose variable

Parameters

lp	current LP data
set	global SCIP settings
var	problem variable that changed from COLUMN to LOOSE

Definition at line 14151 of file lp.c.

References FALSE, SCIP_Lp::looseobjvalinf, lpUpdateObjval(), SCIP_Lp::nloosevars, NULL, SCIP_OKAY, SCIP_Real, SCIP_VARSTATUS_LOOSE, SCIPsetIsInfinity(), SCIPsetIsNegative(), SCIPsetIsPositive(), SCIPvarGetLbLocal(), SCIPvarGetObj(), SCIPvarGetProbindex(), SCIPvarGetStatus(), SCIPvarGetUbLocal(), and TRUE.

Referenced by SCIPlpUpdateVarLoose().

lpUpdateVarLooseProved()

static SCIP_RETCODE lpUpdateVarLooseProved ( SCIP_LP *  lp, SCIP_SET *  set, SCIP_VAR *  var  )

static

informs LP, that given formerly column problem variable is now again a loose variable pseudo objective value is calculated with interval arithmetics to get a proved lower bound

Parameters

lp	current LP data
set	global SCIP settings
var	problem variable that changed from COLUMN to LOOSE

Definition at line 14196 of file lp.c.

References SCIP_Lp::looseobjval, SCIP_Lp::looseobjvalinf, SCIP_Lp::nloosevars, NULL, SCIP_OKAY, SCIP_Real, SCIP_VARSTATUS_LOOSE, SCIPintervalAdd(), SCIPintervalGetInf(), SCIPintervalMul(), SCIPintervalSet(), SCIPsetInfinity(), SCIPsetIsInfinity(), SCIPsetIsNegative(), SCIPvarGetLbLocal(), SCIPvarGetObj(), SCIPvarGetProbindex(), SCIPvarGetStatus(), and SCIPvarGetUbLocal().

Referenced by SCIPlpUpdateVarLoose().

SCIPlpUpdateVarLoose()

SCIP_RETCODE SCIPlpUpdateVarLoose	(	SCIP_LP *	lp,
		SCIP_SET *	set,
		SCIP_VAR *	var
	)

informs LP, that given formerly column problem variable is now again a loose variable

Parameters

lp	current LP data
set	global SCIP settings
var	problem variable that changed from COLUMN to LOOSE

Definition at line 14253 of file lp.c.

References lpUpdateVarLoose(), lpUpdateVarLooseProved(), NULL, SCIP_CALL, and SCIP_OKAY.

Referenced by SCIPvarLoose().

SCIPlpDecNLoosevars()

void SCIPlpDecNLoosevars

(

SCIP_LP *

lp

)

decrease the number of loose variables by one

Parameters

lp	current LP data

Definition at line 14274 of file lp.c.

References SCIP_Lp::looseobjval, SCIP_Lp::looseobjvalinf, SCIP_Lp::nloosevars, and NULL.

Referenced by lpUpdateVarColumn(), SCIPlpUpdateDelVar(), SCIPvarFix(), and SCIPvarMultiaggregate().

SCIPlpGetSol()

SCIP_RETCODE SCIPlpGetSol	(	SCIP_LP *	lp,
		SCIP_SET *	set,
		SCIP_STAT *	stat,
		SCIP_Bool *	primalfeasible,
		SCIP_Bool *	dualfeasible
	)

stores the LP solution in the columns and rows

Parameters

lp	current LP data
set	global SCIP settings
stat	problem statistics
primalfeasible	pointer to store whether the solution is primal feasible, or NULL
dualfeasible	pointer to store whether the solution is dual feasible, or NULL

Definition at line 14292 of file lp.c.

References SCIP_Row::activity, SCIP_Col::basisstatus, SCIP_Row::basisstatus, BMSclearMemoryArray, SCIP_Row::constant, SCIP_Row::dualsol, FALSE, SCIP_Lp::flushed, SCIP_Lp::lastlpalgo, SCIP_Col::lb, SCIP_Row::lhs, SCIP_Stat::lpcount, SCIP_Lp::lpi, SCIP_Lp::lpicols, SCIP_Lp::lpirows, SCIP_Lp::lpobjval, MAX, SCIP_Col::maxprimsol, SCIP_Col::minprimsol, SCIP_Lp::nlpicols, SCIP_Lp::nlpirows, NULL, SCIP_Col::obj, SCIP_Col::primsol, r, SCIP_Col::redcost, SCIP_BASESTAT_BASIC, SCIP_Bool, SCIP_CALL, SCIP_Longint, SCIP_LPALGO_BARRIER, SCIP_OKAY, SCIP_Real, SCIPlpGetSolstat(), SCIPlpiGetBase(), SCIPlpiGetSol(), SCIPsetAllocBufferArray, SCIPsetDebugMsg, SCIPsetFreeBufferArray, SCIPsetIsDualfeasNegative(), SCIPsetIsDualfeasPositive(), SCIPsetIsFeasGE(), SCIPsetIsFeasGT(), SCIPsetIsFeasLE(), SCIPsetIsFeasLT(), SCIPsetIsFeasNegative(), SCIPsetIsFeasPositive(), SCIPsetIsInfinity(), SCIPvarGetName(), SCIP_Lp::solisbasic, SCIP_Lp::solved, TRUE, SCIP_Row::validactivitylp, SCIP_Col::validredcostlp, and SCIP_Lp::validsollp.

Referenced by SCIPlpSolveAndEval(), and SCIPlpStartDive().

SCIPlpGetUnboundedSol()

SCIP_RETCODE SCIPlpGetUnboundedSol	(	SCIP_LP *	lp,
		SCIP_SET *	set,
		SCIP_STAT *	stat,
		SCIP_Bool *	primalfeasible,
		SCIP_Bool *	rayfeasible
	)

stores LP solution with infinite objective value in the columns and rows

Parameters

lp	current LP data
set	global SCIP settings
stat	problem statistics
primalfeasible	pointer to store whether the solution is primal feasible, or NULL
rayfeasible	pointer to store whether the primal ray is a feasible unboundedness proof, or NULL

Definition at line 14586 of file lp.c.

References SCIP_Row::activity, SCIP_Row::cols, SCIP_Row::constant, SCIP_Row::dualsol, FALSE, SCIP_Lp::flushed, SCIP_Col::lb, SCIP_Row::lhs, SCIP_Row::linkpos, SCIP_Stat::lpcount, SCIP_Lp::lpi, SCIP_Lp::lpicols, SCIP_Lp::lpirows, SCIP_Lp::lpobjval, SCIP_Col::lppos, SCIP_Lp::lpsolstat, MAX, SCIP_Row::nlpcols, SCIP_Lp::nlpicols, SCIP_Lp::nlpirows, NULL, SCIP_Row::nunlinked, SCIP_Col::obj, SCIP_Col::primsol, r, SCIP_Col::redcost, SCIP_Row::rhs, SCIP_CALL, SCIP_INVALID, SCIP_Longint, SCIP_LPERROR, SCIP_LPSOLSTAT_UNBOUNDEDRAY, SCIP_OKAY, SCIP_Real, SCIPerrorMessage, SCIPlpiGetPrimalRay(), SCIPlpiGetSol(), SCIPlpiHasPrimalRay(), SCIPsetAllocBufferArray, SCIPsetDebugMsg, SCIPsetFreeBufferArray, SCIPsetInfinity(), SCIPsetIsFeasGE(), SCIPsetIsFeasGT(), SCIPsetIsFeasLE(), SCIPsetIsFeasLT(), SCIPsetIsFeasNegative(), SCIPsetIsFeasPositive(), SCIPsetIsFeasZero(), SCIPsetIsInfinity(), SCIPsetIsNegative(), SCIPsetIsPositive(), SCIPsetIsZero(), SCIPvarGetNLocksDown(), SCIPvarGetNLocksUp(), SCIP_Lp::solved, TRUE, SCIP_Col::ub, SCIP_Row::validactivitylp, SCIP_Col::validredcostlp, SCIP_Lp::validsollp, SCIP_Row::vals, and SCIP_Col::var.

Referenced by SCIPlpSolveAndEval(), and SCIPlpStartDive().

SCIPlpGetPrimalRay()

SCIP_RETCODE SCIPlpGetPrimalRay	(	SCIP_LP *	lp,
		SCIP_SET *	set,
		SCIP_Real *	ray
	)

returns primal ray proving the unboundedness of the current LP

Parameters

lp	current LP data
set	global SCIP settings
ray	array for storing primal ray values, they are stored w.r.t. the problem index of the variables, so the size of this array should be at least number of active variables (all entries have to be initialized to 0 before)

Definition at line 14863 of file lp.c.

References SCIP_Lp::flushed, SCIP_Lp::lpi, SCIP_Lp::lpicols, SCIP_Lp::lpobjval, SCIP_Lp::lpsolstat, SCIP_Lp::nlpicols, NULL, SCIP_CALL, SCIP_LPERROR, SCIP_LPSOLSTAT_UNBOUNDEDRAY, SCIP_OKAY, SCIP_Real, SCIPerrorMessage, SCIPlpiGetPrimalRay(), SCIPlpiHasPrimalRay(), SCIPsetAllocBufferArray, SCIPsetDebugMsg, SCIPsetFreeBufferArray, SCIPsetIsInfinity(), SCIPvarGetProbindex(), SCIP_Lp::solved, and SCIP_Col::var.

Referenced by updatePrimalRay().

SCIPlpGetDualfarkas()

SCIP_RETCODE SCIPlpGetDualfarkas	(	SCIP_LP *	lp,
		SCIP_SET *	set,
		SCIP_STAT *	stat,
		SCIP_Bool *	valid
	)

stores the dual Farkas multipliers for infeasibility proof in rows. besides, the proof is checked for validity if lp/checkfarkas = TRUE.

Note

the check will not be performed if valid is NULL.

Parameters

lp	current LP data
set	global SCIP settings
stat	problem statistics
valid	pointer to store whether the Farkas proof is valid or NULL

Definition at line 14924 of file lp.c.

References SCIP_Row::activity, SCIP_Row::basisstatus, BMSclearMemoryArray, SCIP_Row::constant, SCIP_Row::dualfarkas, SCIP_Row::dualsol, FALSE, SCIP_Lp::flushed, SCIP_Row::len, SCIP_Row::lhs, SCIP_Stat::lpcount, SCIP_Lp::lpi, SCIP_Lp::lpicols, SCIP_Lp::lpirows, SCIP_Lp::lpsolstat, SCIP_Lp::nlpicols, SCIP_Lp::nlpirows, NULL, SCIP_Col::primsol, r, REALABS, SCIP_Col::redcost, SCIP_Row::rhs, SCIP_BASESTAT_BASIC, SCIP_Bool, SCIP_CALL, SCIP_INVALID, SCIP_LPSOLSTAT_INFEASIBLE, SCIP_OKAY, SCIP_Real, SCIPcolGetLb(), SCIPcolGetLPPos(), SCIPcolGetUb(), SCIPlpiGetDualfarkas(), SCIProwGetName(), SCIPsetAllocBufferArray, SCIPsetDebugMsg, SCIPsetFreeBufferArray, SCIPsetIsDualfeasGT(), SCIPsetIsDualfeasLT(), SCIPsetIsFeasZero(), SCIPsetIsGE(), SCIPsetIsInfinity(), SCIP_Lp::solved, TRUE, SCIP_Row::validactivitylp, SCIP_Col::validfarkaslp, SCIP_Lp::validfarkaslp, SCIP_Col::validredcostlp, and SCIP_Row::vals.

Referenced by SCIPlpSolveAndEval(), and SCIPlpStartDive().

SCIPlpGetIterations()

SCIP_RETCODE SCIPlpGetIterations	(	SCIP_LP *	lp,
		int *	iterations
	)

get number of iterations used in last LP solve

Parameters

lp	current LP data
iterations	pointer to store the iteration count

Definition at line 15097 of file lp.c.

References SCIP_Lp::lpi, NULL, SCIP_CALL, SCIP_OKAY, and SCIPlpiGetIterations().

Referenced by lpBarrier(), lpDualSimplex(), lpLexDualSimplex(), and lpPrimalSimplex().

SCIPlpUpdateAges()

SCIP_RETCODE SCIPlpUpdateAges	(	SCIP_LP *	lp,
		SCIP_STAT *	stat
	)

increases age of columns with solution value 0.0 and basic rows with activity not at its bounds, resets age of non-zero columns and sharp rows

Parameters

lp	current LP data
stat	problem statistics

Definition at line 15112 of file lp.c.

References SCIP_Row::activeinlpcounter, SCIP_Col::age, SCIP_Row::age, SCIP_Lp::cols, SCIP_Lp::flushed, SCIP_Stat::lpcount, SCIP_Lp::lpicols, SCIP_Lp::lpirows, SCIP_Lp::ncols, SCIP_Lp::nlpicols, SCIP_Lp::nlpirows, SCIP_Row::nlpsaftercreation, SCIP_Lp::nrows, NULL, r, SCIP_Lp::rows, SCIP_OKAY, SCIPdebugMessage, SCIP_Lp::solved, and SCIP_Lp::validsollp.

Referenced by SCIPlpSolveAndEval().

lpDelColset()

static SCIP_RETCODE lpDelColset ( SCIP_LP *  lp, SCIP_SET *  set, int *  coldstat  )

static

Parameters

lp	current LP data
set	global SCIP settings
coldstat	deletion status of columns: 1 if column should be deleted, 0 if not

Definition at line 15172 of file lp.c.

References checkLazyColArray(), checkLinks, SCIP_Lp::cols, colUpdateDelLP(), SCIP_Lp::diving, FALSE, SCIP_Lp::flushed, SCIP_Lp::lazycols, SCIP_Col::lpdepth, SCIP_Lp::lpi, SCIP_Lp::lpicols, SCIP_Lp::lpifirstchgcol, SCIP_Col::lpipos, SCIP_Lp::lpobjval, SCIP_Col::lppos, SCIP_Lp::lpsolstat, lpUpdateObjNorms(), markColDeleted(), SCIP_Lp::nchgcols, SCIP_Lp::ncols, SCIP_Lp::nlazycols, SCIP_Lp::nlpicols, SCIP_Lp::nremovablecols, NULL, SCIP_Lp::primalchecked, SCIP_Lp::primalfeasible, SCIP_Col::removable, SCIP_CALL, SCIP_INVALID, SCIP_LPSOLSTAT_NOTSOLVED, SCIP_OKAY, SCIPlpiDelColset(), SCIP_Lp::solved, and SCIP_Col::unchangedobj.

Referenced by lpCleanupCols(), and lpRemoveObsoleteCols().

lpDelRowset()

static SCIP_RETCODE lpDelRowset ( SCIP_LP *  lp, BMS_BLKMEM *  blkmem, SCIP_SET *  set, SCIP_EVENTQUEUE *  eventqueue, SCIP_EVENTFILTER *  eventfilter, int *  rowdstat  )

static

Parameters

lp	current LP data
blkmem	block memory buffers
set	global SCIP settings
eventqueue	event queue
eventfilter	global event filter
rowdstat	deletion status of rows: 1 if row should be deleted, 0 if not

Definition at line 15271 of file lp.c.

References checkLinks, SCIP_Lp::diving, SCIP_Lp::dualchecked, SCIP_Lp::dualfeasible, SCIP_EventFilter::eventmask, FALSE, SCIP_Lp::flushed, SCIP_EventFilter::len, SCIP_Row::lpdepth, SCIP_Lp::lpi, SCIP_Lp::lpifirstchgrow, SCIP_Row::lpipos, SCIP_Lp::lpirows, SCIP_Lp::lpobjval, SCIP_Row::lppos, SCIP_Lp::lpsolstat, markRowDeleted(), SCIP_Lp::nchgrows, SCIP_Lp::nlpirows, SCIP_Lp::nremovablerows, SCIP_Lp::nrows, NULL, r, SCIP_Row::removable, SCIP_Lp::rows, rowUpdateDelLP(), SCIP_CALL, SCIP_EVENTTYPE_ROWDELETEDLP, SCIP_INVALID, SCIP_LPSOLSTAT_NOTSOLVED, SCIP_OKAY, SCIPeventCreateRowDeletedLP(), SCIPeventqueueAdd(), SCIPlpiDelRowset(), SCIProwRelease(), SCIProwUnlock(), and SCIP_Lp::solved.

Referenced by lpCleanupRows(), lpRemoveObsoleteRows(), and SCIPlpRemoveRedundantRows().

lpRemoveObsoleteCols()

static SCIP_RETCODE lpRemoveObsoleteCols ( SCIP_LP *  lp, SCIP_SET *  set, SCIP_STAT *  stat, int  firstcol  )

static

removes all non-basic columns, that are too old, beginning with the given firstcol

Parameters

lp	current LP data
set	global SCIP settings
stat	problem statistics
firstcol	first column to check for clean up

Definition at line 15369 of file lp.c.

References SCIP_Col::age, SCIP_Col::basisstatus, BMSclearMemoryArray, SCIP_Lp::cols, SCIP_Lp::diving, SCIP_Lp::flushed, lpDelColset(), SCIP_Lp::lpicols, SCIP_Lp::ncols, SCIP_Lp::nlpicols, SCIP_Stat::nnodes, SCIP_Lp::nremovablecols, NULL, SCIP_Col::obsoletenode, SCIP_BASESTAT_BASIC, SCIP_CALL, SCIP_OKAY, SCIPcolGetBestBound(), SCIPsetAllocBufferArray, SCIPsetDebugMsg, SCIPsetFreeBufferArray, SCIPsetIsZero(), SCIPvarGetName(), and SCIP_Lp::solisbasic.

Referenced by SCIPlpRemoveAllObsoletes(), and SCIPlpRemoveNewObsoletes().

lpRemoveObsoleteRows()

static SCIP_RETCODE lpRemoveObsoleteRows ( SCIP_LP *  lp, BMS_BLKMEM *  blkmem, SCIP_SET *  set, SCIP_STAT *  stat, SCIP_EVENTQUEUE *  eventqueue, SCIP_EVENTFILTER *  eventfilter, int  firstrow  )

static

removes all basic rows, that are too old, beginning with the given firstrow

Parameters

lp	current LP data
blkmem	block memory buffers
set	global SCIP settings
stat	problem statistics
eventqueue	event queue
eventfilter	global event filter
firstrow	first row to check for clean up

Definition at line 15445 of file lp.c.

References SCIP_Row::age, SCIP_Row::basisstatus, BMSclearMemoryArray, SCIP_Lp::diving, SCIP_Lp::flushed, lpDelRowset(), SCIP_Lp::lpirows, SCIP_Lp::nlpirows, SCIP_Stat::nnodes, SCIP_Lp::nremovablerows, SCIP_Lp::nrows, NULL, SCIP_Row::obsoletenode, r, SCIP_Lp::rows, SCIP_BASESTAT_BASIC, SCIP_CALL, SCIP_OKAY, SCIPsetAllocBufferArray, SCIPsetDebugMsg, SCIPsetFreeBufferArray, and SCIP_Lp::solisbasic.

Referenced by SCIPlpRemoveAllObsoletes(), and SCIPlpRemoveNewObsoletes().

SCIPlpRemoveNewObsoletes()

SCIP_RETCODE SCIPlpRemoveNewObsoletes	(	SCIP_LP *	lp,
		BMS_BLKMEM *	blkmem,
		SCIP_SET *	set,
		SCIP_STAT *	stat,
		SCIP_EVENTQUEUE *	eventqueue,
		SCIP_EVENTFILTER *	eventfilter
	)

removes all non-basic columns and basic rows in the part of the LP created at the current node, that are too old

Parameters

lp	current LP data
blkmem	block memory buffers
set	global SCIP settings
stat	problem statistics
eventqueue	event queue
eventfilter	global event filter

Definition at line 15521 of file lp.c.

References SCIP_Lp::diving, SCIP_Lp::firstnewcol, SCIP_Lp::firstnewrow, lpRemoveObsoleteCols(), lpRemoveObsoleteRows(), SCIP_Lp::ncols, SCIP_Lp::nrows, NULL, SCIP_CALL, SCIP_LPSOLSTAT_OPTIMAL, SCIP_OKAY, SCIPlpGetSolstat(), SCIPsetDebugMsg, and SCIP_Lp::solved.

Referenced by SCIPlpSolveAndEval().

SCIPlpRemoveAllObsoletes()

SCIP_RETCODE SCIPlpRemoveAllObsoletes	(	SCIP_LP *	lp,
		BMS_BLKMEM *	blkmem,
		SCIP_SET *	set,
		SCIP_STAT *	stat,
		SCIP_EVENTQUEUE *	eventqueue,
		SCIP_EVENTFILTER *	eventfilter
	)

removes all non-basic columns and basic rows in whole LP, that are too old

Parameters

lp	current LP data
blkmem	block memory buffers
set	global SCIP settings
stat	problem statistics
eventqueue	event queue
eventfilter	global event filter

Definition at line 15552 of file lp.c.

References SCIP_Lp::diving, lpRemoveObsoleteCols(), lpRemoveObsoleteRows(), SCIP_Lp::ncols, SCIP_Lp::nrows, NULL, SCIP_CALL, SCIP_LPSOLSTAT_OPTIMAL, SCIP_OKAY, SCIPlpGetSolstat(), SCIPsetDebugMsg, and SCIP_Lp::solved.

Referenced by focusnodeToFork().

lpCleanupCols()

static SCIP_RETCODE lpCleanupCols ( SCIP_LP *  lp, SCIP_SET *  set, SCIP_STAT *  stat, int  firstcol  )

static

removes all non-basic columns at 0.0 beginning with the given firstcol

Parameters

lp	current LP data
set	global SCIP settings
stat	problem statistics
firstcol	first column to check for clean up

Definition at line 15583 of file lp.c.

References BMSclearMemoryArray, SCIP_Lp::cols, SCIP_Lp::diving, SCIP_Lp::flushed, SCIP_Stat::lpcount, lpDelColset(), SCIP_Lp::lpicols, SCIP_Lp::ncols, SCIP_Lp::nlpicols, SCIP_Lp::nremovablecols, NULL, SCIP_BASESTAT_BASIC, SCIP_CALL, SCIP_OKAY, SCIPcolGetBestBound(), SCIPsetAllocBufferArray, SCIPsetDebugMsg, SCIPsetFreeBufferArray, SCIPsetIsZero(), SCIP_Lp::solisbasic, and SCIP_Lp::validsollp.

Referenced by SCIPlpCleanupAll(), and SCIPlpCleanupNew().

lpCleanupRows()

static SCIP_RETCODE lpCleanupRows ( SCIP_LP *  lp, BMS_BLKMEM *  blkmem, SCIP_SET *  set, SCIP_STAT *  stat, SCIP_EVENTQUEUE *  eventqueue, SCIP_EVENTFILTER *  eventfilter, int  firstrow  )

static

removes all basic rows beginning with the given firstrow

Parameters

lp	current LP data
blkmem	block memory buffers
set	global SCIP settings
stat	problem statistics
eventqueue	event queue
eventfilter	global event filter
firstrow	first row to check for clean up

Definition at line 15650 of file lp.c.

References BMSclearMemoryArray, SCIP_Lp::diving, SCIP_Lp::flushed, SCIP_Stat::lpcount, lpDelRowset(), SCIP_Lp::lpirows, SCIP_Lp::ncols, SCIP_Lp::nlpicols, SCIP_Lp::nlpirows, SCIP_Lp::nremovablerows, SCIP_Lp::nrows, NULL, r, SCIP_Lp::rows, SCIP_BASESTAT_BASIC, SCIP_CALL, SCIP_OKAY, SCIPsetAllocBufferArray, SCIPsetDebugMsg, SCIPsetFreeBufferArray, SCIP_Lp::solisbasic, and SCIP_Lp::validsollp.

Referenced by SCIPlpCleanupAll(), and SCIPlpCleanupNew().

SCIPlpCleanupNew()

SCIP_RETCODE SCIPlpCleanupNew	(	SCIP_LP *	lp,
		BMS_BLKMEM *	blkmem,
		SCIP_SET *	set,
		SCIP_STAT *	stat,
		SCIP_EVENTQUEUE *	eventqueue,
		SCIP_EVENTFILTER *	eventfilter,
		SCIP_Bool	root
	)

removes all non-basic columns at 0.0 and basic rows in the part of the LP created at the current node

Parameters

lp	current LP data
blkmem	block memory buffers
set	global SCIP settings
stat	problem statistics
eventqueue	event queue
eventfilter	global event filter
root	are we at the root node?

Definition at line 15721 of file lp.c.

References SCIP_Lp::diving, SCIP_Lp::firstnewcol, SCIP_Lp::firstnewrow, SCIP_Lp::lastlpalgo, lpCleanupCols(), lpCleanupRows(), SCIP_Lp::ncols, SCIP_Lp::nrows, NULL, SCIP_Bool, SCIP_CALL, SCIP_LPSOLSTAT_OPTIMAL, SCIP_OKAY, SCIPlpGetSolstat(), SCIPsetDebugMsg, SCIP_Lp::solisbasic, and SCIP_Lp::solved.

Referenced by focusnodeToFork().

SCIPlpCleanupAll()

SCIP_RETCODE SCIPlpCleanupAll	(	SCIP_LP *	lp,
		BMS_BLKMEM *	blkmem,
		SCIP_SET *	set,
		SCIP_STAT *	stat,
		SCIP_EVENTQUEUE *	eventqueue,
		SCIP_EVENTFILTER *	eventfilter,
		SCIP_Bool	root
	)

removes all non-basic columns at 0.0 and basic rows in the whole LP

Parameters

lp	current LP data
blkmem	block memory buffers
set	global SCIP settings
stat	problem statistics
eventqueue	event queue
eventfilter	global event filter
root	are we at the root node?

Definition at line 15760 of file lp.c.

References SCIP_Lp::diving, SCIP_Lp::lastlpalgo, lpCleanupCols(), lpCleanupRows(), SCIP_Lp::ncols, SCIP_Lp::nrows, NULL, SCIP_Bool, SCIP_CALL, SCIP_LPSOLSTAT_OPTIMAL, SCIP_OKAY, SCIPlpGetSolstat(), SCIPsetDebugMsg, SCIP_Lp::solisbasic, and SCIP_Lp::solved.

Referenced by focusnodeToFork().

SCIPlpRemoveRedundantRows()

SCIP_RETCODE SCIPlpRemoveRedundantRows	(	SCIP_LP *	lp,
		BMS_BLKMEM *	blkmem,
		SCIP_SET *	set,
		SCIP_STAT *	stat,
		SCIP_EVENTQUEUE *	eventqueue,
		SCIP_EVENTFILTER *	eventfilter
	)

removes all redundant rows that were added at the current node

Parameters

lp	current LP data
blkmem	block memory buffers
set	global SCIP settings
stat	problem statistics
eventqueue	event queue
eventfilter	global event filter

Definition at line 15799 of file lp.c.

References SCIP_Row::basisstatus, BMSclearMemoryArray, SCIP_Lp::diving, SCIP_Lp::firstnewrow, SCIP_Lp::flushed, SCIP_Stat::lpcount, lpDelRowset(), SCIP_Lp::lpirows, SCIP_Lp::ncols, SCIP_Lp::nlpicols, SCIP_Lp::nlpirows, SCIP_Lp::nrows, NULL, r, SCIP_Lp::rows, SCIP_BASESTAT_BASIC, SCIP_CALL, SCIP_OKAY, SCIProwGetLhs(), SCIProwGetMaxActivity(), SCIProwGetMinActivity(), SCIProwGetName(), SCIProwGetRhs(), SCIProwIsRedundant(), SCIPsetAllocBufferArray, SCIPsetDebugMsg, SCIPsetFreeBufferArray, SCIP_Lp::solisbasic, and SCIP_Lp::validsollp.

Referenced by priceAndCutLoop().

SCIPlpStartDive()

SCIP_RETCODE SCIPlpStartDive	(	SCIP_LP *	lp,
		BMS_BLKMEM *	blkmem,
		SCIP_SET *	set,
		SCIP_STAT *	stat
	)

initiates LP diving

Parameters

lp	current LP data
blkmem	block memory
set	global SCIP settings
stat	problem statistics

Definition at line 15873 of file lp.c.

References SCIP_Lp::cols, colStoreSolVals(), SCIP_Lp::divelpistate, SCIP_Lp::divelpwasdualchecked, SCIP_Lp::divelpwasdualfeas, SCIP_Lp::divelpwasprimchecked, SCIP_Lp::divelpwasprimfeas, SCIP_Lp::divenolddomchgs, SCIP_Lp::diving, SCIP_Lp::divinglpiitlim, SCIP_Stat::domchgcount, SCIP_Lp::dualchecked, SCIP_Lp::dualfeasible, FALSE, SCIP_Lp::flushed, SCIP_Col::lb, SCIP_Stat::lpcount, SCIP_Lp::lpi, SCIP_LpSolVals::lpsolstat, SCIP_Lp::lpsolstat, lpStoreSolVals(), SCIP_Lp::ncols, SCIP_Lp::ndivechgsides, SCIP_Lp::ndivingrows, SCIP_Lp::nrows, NULL, SCIP_Col::obj, SCIP_Lp::primalchecked, SCIP_Lp::primalfeasible, SCIP_Lp::probing, r, SCIP_Lp::rows, rowStoreSolVals(), SCIP_Bool, SCIP_CALL, SCIP_LPPAR_LPITLIM, SCIP_LPSOLSTAT_ERROR, SCIP_LPSOLSTAT_INFEASIBLE, SCIP_LPSOLSTAT_ITERLIMIT, SCIP_LPSOLSTAT_NOTSOLVED, SCIP_LPSOLSTAT_OBJLIMIT, SCIP_LPSOLSTAT_OPTIMAL, SCIP_LPSOLSTAT_TIMELIMIT, SCIP_LPSOLSTAT_UNBOUNDEDRAY, SCIP_OKAY, SCIP_VARSTATUS_COLUMN, SCIPlpGetDualfarkas(), SCIPlpGetSol(), SCIPlpGetSolstat(), SCIPlpGetUnboundedSol(), SCIPlpiGetIntpar(), SCIPlpiGetState(), SCIPsetDebugMsg, SCIPsetIsFeasEQ(), SCIPvarGetCol(), SCIPvarGetLbLocal(), SCIPvarGetObj(), SCIPvarGetStatus(), SCIPvarGetUbLocal(), SCIP_Lp::solved, SCIP_Lp::storedsolvals, TRUE, SCIP_Col::ub, SCIP_Lp::validsollp, and SCIP_Col::var.

Referenced by SCIPstartDive().

SCIPlpEndDive()

SCIP_RETCODE SCIPlpEndDive	(	SCIP_LP *	lp,
		BMS_BLKMEM *	blkmem,
		SCIP_SET *	set,
		SCIP_MESSAGEHDLR *	messagehdlr,
		SCIP_STAT *	stat,
		SCIP_EVENTQUEUE *	eventqueue,
		SCIP_EVENTFILTER *	eventfilter,
		SCIP_PROB *	prob,
		SCIP_VAR **	vars,
		int	nvars
	)

quits LP diving and resets bounds and objective values of columns to the current node's values

Parameters

lp	current LP data
blkmem	block memory
set	global SCIP settings
messagehdlr	message handler
stat	problem statistics
eventqueue	event queue
eventfilter	global event filter
prob	problem data
vars	array with all active variables
nvars	number of active variables

Definition at line 15979 of file lp.c.

References colRestoreSolVals(), SCIP_Lp::cols, SCIP_Lp::divechgrows, SCIP_Lp::divechgsides, SCIP_Lp::divechgsidetypes, SCIP_Lp::divelpistate, SCIP_Lp::divelpwasdualchecked, SCIP_Lp::divelpwasdualfeas, SCIP_Lp::divelpwasprimchecked, SCIP_Lp::divelpwasprimfeas, SCIP_Lp::divenolddomchgs, SCIP_Lp::diving, SCIP_Lp::divinglazyapplied, SCIP_Lp::divinglpiitlim, SCIP_Lp::divingobjchg, SCIP_Stat::domchgcount, FALSE, SCIP_Lp::flushed, SCIP_Col::lb, SCIP_Stat::lpcount, SCIP_LpSolVals::lpissolved, lpNumericalTroubleMessage(), lpRestoreSolVals(), lpSetIterationLimit(), SCIP_LpSolVals::lpsolstat, SCIP_Lp::ncols, SCIP_Lp::ndivechgsides, SCIP_Lp::ndivingrows, SCIP_Lp::nlazycols, SCIP_Lp::nrows, NULL, SCIP_Col::obj, r, SCIP_Lp::resolvelperror, rowRestoreSolVals(), SCIP_Lp::rows, SCIP_Bool, SCIP_CALL, SCIP_LPSOLSTAT_INFEASIBLE, SCIP_LPSOLSTAT_ITERLIMIT, SCIP_LPSOLSTAT_OBJLIMIT, SCIP_LPSOLSTAT_OPTIMAL, SCIP_LPSOLSTAT_TIMELIMIT, SCIP_LPSOLSTAT_UNBOUNDEDRAY, SCIP_OKAY, SCIP_Real, SCIP_SIDETYPE_LEFT, SCIP_VARSTATUS_COLUMN, SCIP_VERBLEVEL_FULL, SCIPcolChgLb(), SCIPcolChgObj(), SCIPcolChgUb(), SCIPlpFlush(), SCIPlpFreeState(), SCIPlpGetSolstat(), SCIPlpSetState(), SCIPlpShrinkRows(), SCIPlpSolveAndEval(), SCIPmessagePrintVerbInfo(), SCIProwChgLhs(), SCIProwChgRhs(), SCIPsetDebugMsg, SCIPsetIsEQ(), SCIPstatIncrement, SCIPvarGetCol(), SCIPvarGetLbLocal(), SCIPvarGetObj(), SCIPvarGetStatus(), SCIPvarGetUbLocal(), SCIP_Lp::storedsolvals, TRUE, SCIP_Col::ub, updateLazyBounds(), and SCIP_Col::var.

Referenced by SCIPendDive().

SCIPlpRecordOldRowSideDive()

SCIP_RETCODE SCIPlpRecordOldRowSideDive	(	SCIP_LP *	lp,
		SCIP_ROW *	row,
		SCIP_SIDETYPE	sidetype
	)

records a current row side such that any change will be undone after diving

Parameters

lp	LP data object
row	row affected by the change
sidetype	side type

Definition at line 16161 of file lp.c.

References SCIP_Lp::divechgrows, SCIP_Lp::divechgsides, SCIP_Lp::divechgsidessize, SCIP_Lp::divechgsidetypes, DIVESTACKGROWFACT, SCIP_Row::lhs, SCIP_Lp::ndivechgsides, NULL, reallocDiveChgSideArrays(), SCIP_Row::rhs, SCIP_CALL, SCIP_OKAY, and SCIP_SIDETYPE_LEFT.

Referenced by SCIPchgRowLhsDive(), and SCIPchgRowRhsDive().

SCIPlpStartProbing()

SCIP_RETCODE SCIPlpStartProbing

(

SCIP_LP *

lp

)

informs the LP that probing mode was initiated

Parameters

lp	current LP data

Definition at line 16185 of file lp.c.

References NULL, SCIP_Lp::probing, SCIP_OKAY, SCIP_Lp::strongbranching, SCIP_Lp::strongbranchprobing, and TRUE.

Referenced by SCIPtreeStartProbing().

SCIPlpEndProbing()

SCIP_RETCODE SCIPlpEndProbing

(

SCIP_LP *

lp

)

informs the LP that probing mode was finished

Parameters

lp	current LP data

Definition at line 16200 of file lp.c.

References FALSE, NULL, SCIP_Lp::probing, SCIP_OKAY, SCIP_Lp::strongbranching, and SCIP_Lp::strongbranchprobing.

Referenced by SCIPtreeEndProbing().

SCIPlpStartStrongbranchProbing()

void SCIPlpStartStrongbranchProbing

(

SCIP_LP *

lp

)

informs the LP that the probing mode is now used for strongbranching

Parameters

lp	current LP data

Definition at line 16215 of file lp.c.

References NULL, SCIP_Lp::probing, SCIP_Lp::strongbranching, SCIP_Lp::strongbranchprobing, and TRUE.

Referenced by SCIPstartStrongbranch().

SCIPlpEndStrongbranchProbing()

void SCIPlpEndStrongbranchProbing

(

SCIP_LP *

lp

)

informs the LP that the probing mode is not used for strongbranching anymore

Parameters

lp	current LP data

Definition at line 16228 of file lp.c.

References FALSE, NULL, SCIP_Lp::probing, SCIP_Lp::strongbranching, and SCIP_Lp::strongbranchprobing.

Referenced by SCIPendStrongbranch().

provedBound()

static SCIP_RETCODE provedBound ( SCIP_LP *  lp, SCIP_SET *  set, SCIP_Bool  usefarkas, SCIP_Real *  bound  )

static

calculates y*b + min{(c - y*A)*x | lb <= x <= ub} for given vectors y and c; the vector b is defined with b[i] = lhs[i] if y[i] >= 0, b[i] = rhs[i] if y[i] < 0 Calculating this value in interval arithmetics gives a proved lower LP bound for the following reason (assuming, we have only left hand sides): min{cx | b <= Ax, lb <= x <= ub} >= min{cx | yb <= yAx, lb <= x <= ub} (restriction in minimum is relaxed) == yb + min{cx - yb | yb <= yAx, lb <= x <= ub} (added yb - yb == 0) >= yb + min{cx - yAx | yb <= yAx, lb <= x <= ub} (because yAx >= yb inside minimum) >= yb + min{cx - yAx | lb <= x <= ub} (restriction in minimum is relaxed)

Parameters

lp	current LP data
set	global SCIP settings
usefarkas	use y = dual Farkas and c = 0 instead of y = dual solution and c = obj?
bound	result of interval arithmetic minimization

Definition at line 16251 of file lp.c.

References a, b, SCIP_Lp::cols, SCIP_Row::constant, SCIP_Row::dualfarkas, SCIP_Row::dualsol, SCIP_Col::lb, SCIP_Row::lhs, SCIP_Col::linkpos, SCIP_Row::lppos, SCIP_Lp::ncols, SCIP_Col::nlprows, SCIP_Lp::nrows, NULL, SCIP_Col::nunlinked, SCIP_Col::obj, SCIP_Row::rhs, SCIP_Col::rows, SCIP_Lp::rows, SCIP_CALL, SCIP_OKAY, SCIP_Real, SCIPcolGetLb(), SCIPcolGetUb(), SCIPintervalAdd(), SCIPintervalGetInf(), SCIPintervalMul(), SCIPintervalSet(), SCIPintervalSetBounds(), SCIPintervalSub(), SCIPsetAllocBufferArray, SCIPsetFreeBufferArray, SCIPsetInfinity(), SCIPsetIsFeasNegative(), SCIPsetIsFeasPositive(), SCIP_Lp::solved, SCIP_Col::ub, SCIP_Col::vals, x, and y.

Referenced by SCIPlpGetProvedLowerbound(), and SCIPlpIsInfeasibilityProved().

SCIPlpGetProvedLowerbound()

SCIP_RETCODE SCIPlpGetProvedLowerbound	(	SCIP_LP *	lp,
		SCIP_SET *	set,
		SCIP_Real *	bound
	)

gets proven lower (dual) bound of last LP solution

Parameters

lp	current LP data
set	global SCIP settings
bound	pointer to store proven dual bound

Definition at line 16361 of file lp.c.

References FALSE, provedBound(), SCIP_CALL, SCIP_OKAY, and SCIPsetDebugMsg.

Referenced by SCIPnodeUpdateLowerboundLP(), and solveNodeInitialLP().

SCIPlpIsInfeasibilityProved()

SCIP_RETCODE SCIPlpIsInfeasibilityProved	(	SCIP_LP *	lp,
		SCIP_SET *	set,
		SCIP_Bool *	proved
	)

gets proven dual bound of last LP solution

Parameters

lp	current LP data
set	global SCIP settings
proved	pointer to store whether infeasibility is proven

Definition at line 16375 of file lp.c.

References bound, NULL, provedBound(), SCIP_CALL, SCIP_OKAY, SCIP_Real, SCIPsetDebugMsg, and TRUE.

SCIPlpWrite()

SCIP_RETCODE SCIPlpWrite	(	SCIP_LP *	lp,
		const char *	fname
	)

writes LP to a file

Parameters

lp	current LP data
fname	file name

Definition at line 16397 of file lp.c.

References SCIP_Lp::flushed, SCIP_Lp::lpi, NULL, SCIP_CALL, SCIP_OKAY, and SCIPlpiWriteLP().

Referenced by lpBarrier(), lpDualSimplex(), lpPrimalSimplex(), and SCIPwriteLP().

SCIPlpWriteMip()

SCIP_RETCODE SCIPlpWriteMip	(	SCIP_LP *	lp,
		SCIP_SET *	set,
		SCIP_MESSAGEHDLR *	messagehdlr,
		const char *	fname,
		SCIP_Bool	genericnames,
		SCIP_Bool	origobj,
		SCIP_OBJSENSE	objsense,
		SCIP_Real	objscale,
		SCIP_Real	objoffset,
		SCIP_Bool	lazyconss
	)

writes MIP relaxation of the current B&B node to a file

Note

the transformed problem in SCIP is always a minimization problem

Parameters

lp	current LP data
set	global SCIP settings
messagehdlr	message handler
fname	file name
genericnames	should generic names like x_i and row_j be used in order to avoid troubles with reserved symbols?
origobj	should the original objective function be used?
objsense	objective sense
objscale	objective scaling factor
objoffset	objective offset, e.g., caused by variable fixings in presolving
lazyconss	output removable rows as lazy constraints?

Definition at line 16412 of file lp.c.

References SCIP_Row::cols, SCIP_Lp::cols, SCIP_Row::constant, SCIP_Lp::flushed, SCIP_Col::lb, SCIP_Row::lhs, SCIP_Col::lppos, SCIP_Row::lppos, SCIP_Row::name, SCIP_Var::name, SCIP_Lp::ncols, SCIP_Row::nlpcols, SCIP_Lp::nrows, NULL, SCIP_Col::obj, REALABS, SCIP_Row::rhs, SCIP_Lp::rows, SCIP_ERROR, SCIP_FILECREATEERROR, SCIP_MAXSTRLEN, SCIP_OBJSENSE_MINIMIZE, SCIP_OKAY, SCIP_Real, SCIPerrorMessage, SCIPmessageFPrintInfo(), SCIPmessagePrintWarning(), SCIPprintSysError(), SCIProwIsRemovable(), SCIPsetDebugMsg, SCIPsetIsEQ(), SCIPsetIsInfinity(), SCIPsnprintf(), SCIPvarIsIntegral(), SCIP_Col::ub, SCIP_Row::vals, and SCIP_Col::var.

Referenced by SCIPwriteMIP().

SCIPlpGetCols()

SCIP_COL** SCIPlpGetCols

(

SCIP_LP *

lp

)

gets array with columns of the LP

Parameters

lp	current LP data

Definition at line 17414 of file lp.c.

References SCIP_Lp::cols, and NULL.

Referenced by branchcandCalcLPCands(), forkFree(), SCIPcomputeLPRelIntPoint(), SCIPgetLPCols(), SCIPgetLPColsData(), and SCIPsolLinkLPSol().

SCIPlpGetNCols()

int SCIPlpGetNCols

(

SCIP_LP *

lp

)

gets current number of columns in LP

Parameters

lp	current LP data

Definition at line 17424 of file lp.c.

References SCIP_Lp::ncols, and NULL.

Referenced by branchcandCalcLPCands(), focusnodeCleanupVars(), focusnodeToFork(), forkFree(), getDualProof(), initLP(), probingnodeCreate(), probingnodeUpdate(), runBoundHeuristic(), SCIPcomputeLPRelIntPoint(), SCIPgetLPColsData(), SCIPgetNLPCols(), SCIPnodeFocus(), SCIPpricestoreAddProbVars(), SCIPpricestoreApplyVars(), SCIPprobAllColsInLP(), SCIPsolLinkLPSol(), SCIPtreeLoadLP(), treeBacktrackProbing(), and treeCreateProbingNode().

SCIPlpGetRows()

SCIP_ROW** SCIPlpGetRows

(

SCIP_LP *

lp

)

gets array with rows of the LP

Parameters

lp	current LP data

Definition at line 17434 of file lp.c.

References NULL, and SCIP_Lp::rows.

Referenced by forkFree(), getDualProof(), getFarkasProof(), runBoundHeuristic(), SCIPgetLPRows(), SCIPgetLPRowsData(), and storeCuts().

SCIPlpGetNRows()

int SCIPlpGetNRows

(

SCIP_LP *

lp

)

gets current number of rows in LP

Parameters

lp	current LP data

Definition at line 17444 of file lp.c.

References SCIP_Lp::nrows, and NULL.

Referenced by focusnodeToFork(), forkFree(), getDualProof(), getFarkasProof(), initLP(), probingnodeCreate(), probingnodeUpdate(), runBoundHeuristic(), SCIPgetLPRowsData(), SCIPgetNLPRows(), SCIPnodeFocus(), SCIPtreeLoadLP(), storeCuts(), treeBacktrackProbing(), and treeCreateProbingNode().

SCIPlpGetNewcols()

SCIP_COL** SCIPlpGetNewcols

(

SCIP_LP *

lp

)

gets array with newly added columns after the last mark

Parameters

lp	current LP data

Definition at line 17454 of file lp.c.

References SCIP_Lp::cols, SCIP_Lp::firstnewcol, SCIP_Lp::ncols, and NULL.

Referenced by forkCreate(), and pseudoforkCreate().

SCIPlpGetNNewcols()

int SCIPlpGetNNewcols

(

SCIP_LP *

lp

)

gets number of newly added columns after the last mark

Parameters

lp	current LP data

Definition at line 17465 of file lp.c.

References SCIP_Lp::firstnewcol, SCIP_Lp::ncols, and NULL.

Referenced by focusnodeCleanupVars(), focusnodeToFork(), focusnodeToJunction(), forkCreate(), pseudoforkCreate(), and SCIPnodeFocus().

SCIPlpGetNewrows()

SCIP_ROW** SCIPlpGetNewrows

(

SCIP_LP *

lp

)

gets array with newly added rows after the last mark

Parameters

lp	current LP data

Definition at line 17476 of file lp.c.

References SCIP_Lp::firstnewrow, SCIP_Lp::nrows, NULL, and SCIP_Lp::rows.

Referenced by forkCreate(), and pseudoforkCreate().

SCIPlpGetNNewrows()

int SCIPlpGetNNewrows

(

SCIP_LP *

lp

)

gets number of newly added rows after the last mark

Parameters

lp	current LP data

Definition at line 17487 of file lp.c.

References SCIP_Lp::firstnewrow, SCIP_Lp::nrows, and NULL.

Referenced by focusnodeToFork(), forkCreate(), pseudoforkCreate(), and SCIPnodeFocus().

SCIPlpRecalculateObjSqrNorm()

void SCIPlpRecalculateObjSqrNorm	(	SCIP_SET *	set,
		SCIP_LP *	lp
	)

recalculates Euclidean norm of objective function vector of column variables if it have gotten unreliable during calculation

Parameters

set	global SCIP settings
lp	LP data

Definition at line 17498 of file lp.c.

References SCIP_Lp::cols, FALSE, MAX, SCIP_Lp::ncols, NULL, SCIP_Lp::objsqrnorm, SCIP_Lp::objsqrnormunreliable, and SCIPsetIsGE().

Referenced by SCIPgetObjNorm(), and SCIProwGetObjParallelism().

SCIPlpGetObjNorm()

SCIP_Real SCIPlpGetObjNorm

(

SCIP_LP *

lp

)

gets Euclidean norm of objective function vector of column variables, only use this method if lp->objsqrnormunreliable == FALSE, so probably you have to call SCIPlpRecalculateObjSqrNorm before

Parameters

lp

LP data

Definition at line 17529 of file lp.c.

References NULL, SCIP_Lp::objsqrnorm, and SCIP_Lp::objsqrnormunreliable.

Referenced by SCIPgetObjNorm().

SCIPlpSetRootLPIsRelax()

void SCIPlpSetRootLPIsRelax	(	SCIP_LP *	lp,
		SCIP_Bool	isrelax
	)

sets whether the root lp is a relaxation of the problem and its optimal objective value is a global lower bound

Parameters

lp	LP data
isrelax	is the root lp a relaxation of the problem?

Definition at line 17541 of file lp.c.

References NULL, and SCIP_Lp::rootlpisrelax.

Referenced by SCIPprobStoreRootSol().

SCIPlpIsRootLPRelax()

SCIP_Bool SCIPlpIsRootLPRelax

(

SCIP_LP *

lp

)

returns whether the root lp is a relaxation of the problem and its optimal objective value is a global lower bound

Parameters

lp

LP data

Definition at line 17552 of file lp.c.

References NULL, and SCIP_Lp::rootlpisrelax.

Referenced by SCIPisRootLPRelax().

SCIPlpGetRootObjval()

SCIP_Real SCIPlpGetRootObjval

(

SCIP_LP *

lp

)

gets the objective value of the root node LP; returns SCIP_INVALID if the root node LP was not (yet) solved

Parameters

lp

LP data

Definition at line 17562 of file lp.c.

References NULL, SCIP_Lp::rootlooseobjval, SCIP_Lp::rootlpobjval, and SCIP_INVALID.

Referenced by SCIPgetLPRootObjval().

SCIPlpGetRootColumnObjval()

SCIP_Real SCIPlpGetRootColumnObjval

(

SCIP_LP *

lp

)

gets part of the objective value of the root node LP that results from COLUMN variables only; returns SCIP_INVALID if the root node LP was not (yet) solved

Parameters

lp

LP data

Definition at line 17574 of file lp.c.

References NULL, and SCIP_Lp::rootlpobjval.

Referenced by SCIPgetLPRootColumnObjval().

SCIPlpGetRootLooseObjval()

SCIP_Real SCIPlpGetRootLooseObjval

(

SCIP_LP *

lp

)

gets part of the objective value of the root node LP that results from LOOSE variables only; returns SCIP_INVALID if the root node LP was not (yet) solved

Parameters

lp

LP data

Definition at line 17586 of file lp.c.

References NULL, and SCIP_Lp::rootlooseobjval.

Referenced by SCIPgetLPRootLooseObjval().

SCIPlpGetLPI()

SCIP_LPI* SCIPlpGetLPI

(

SCIP_LP *

lp

)

gets the LP solver interface

Parameters

lp	current LP data

Definition at line 17596 of file lp.c.

References SCIP_Lp::lpi, and NULL.

Referenced by conflictAnalyzeLP(), SCIPconflictAnalyzeLP(), SCIPgetLPI(), SCIPlpSolveAndEval(), SCIPprintLPSolutionQuality(), solveNodeLP(), undoBdchgsDualfarkas(), and undoBdchgsDualsol().

SCIPlpSetIsRelax()

void SCIPlpSetIsRelax	(	SCIP_LP *	lp,
		SCIP_Bool	relax
	)

sets whether the current LP is a relaxation of the current problem and its optimal objective value is a local lower bound

Parameters

lp	LP data
relax	is the current lp a relaxation?

Definition at line 17606 of file lp.c.

References SCIP_Lp::isrelax, and NULL.

Referenced by SCIPpriceLoop(), SCIPtreeEndProbing(), and solveProbingLP().

SCIPlpIsRelax()

SCIP_Bool SCIPlpIsRelax

(

SCIP_LP *

lp

)

returns whether the current LP is a relaxation of the problem for which it has been solved and its solution value a valid local lower bound?

Parameters

lp

LP data

Definition at line 17619 of file lp.c.

References SCIP_Lp::isrelax, and NULL.

Referenced by priceAndCutLoop(), propAndSolve(), SCIPendDive(), SCIPisLPRelax(), SCIPprobStoreRootSol(), SCIPtreeEndProbing(), solveNodeInitialLP(), and updateEstimate().

SCIPlpIsSolved()

SCIP_Bool SCIPlpIsSolved

(

SCIP_LP *

lp

)

returns whether the current LP is flushed and solved

Parameters

lp	current LP data

Definition at line 17629 of file lp.c.

References SCIP_Lp::flushed, NULL, and SCIP_Lp::solved.

Referenced by priceAndCutLoop(), SCIPendDive(), SCIPlinkLPSol(), SCIPsolCreateLPSol(), and SCIPsolLinkCurrentSol().

SCIPlpIsPrimalReliable()

SCIP_Bool SCIPlpIsPrimalReliable

(

SCIP_LP *

lp

)

return whether the current LP solution passed the primal feasibility check

Parameters

lp	current LP data

Definition at line 17639 of file lp.c.

References NULL, SCIP_Lp::primalchecked, and SCIP_Lp::primalfeasible.

Referenced by SCIPisLPPrimalReliable().

SCIPlpIsDualReliable()

SCIP_Bool SCIPlpIsDualReliable

(

SCIP_LP *

lp

)

return whether the current LP solution passed the dual feasibility check

Parameters

lp	current LP data

Definition at line 17649 of file lp.c.

References SCIP_Lp::dualchecked, SCIP_Lp::dualfeasible, and NULL.

Referenced by analyzeStrongbranch(), SCIPisLPDualReliable(), SCIPlpGetDegeneracy(), and SCIPprobUpdateBestRootSol().

SCIPlpIsSolBasic()

SCIP_Bool SCIPlpIsSolBasic

(

SCIP_LP *

lp

)

returns whether the current LP solution is a basic solution

Parameters

lp	current LP data

Definition at line 17659 of file lp.c.

References NULL, and SCIP_Lp::solisbasic.

Referenced by getImplVarRedcost(), SCIPgetLPBasisInd(), SCIPgetLPBInvACol(), SCIPgetLPBInvARow(), SCIPgetLPBInvCol(), SCIPgetLPBInvRow(), SCIPisLPSolBasic(), SCIPprobUpdateBestRootSol(), and SCIPvarGetImplRedcost().

SCIPlpDiving()

SCIP_Bool SCIPlpDiving

(

SCIP_LP *

lp

)

returns whether the LP is in diving mode

Parameters

lp	current LP data

Definition at line 17669 of file lp.c.

References SCIP_Lp::diving, and NULL.

Referenced by computeLPBounds(), conflictAnalyzeBoundexceedingLP(), conflictAnalyzeInfeasibleLP(), SCIPaddRowDive(), SCIPchgCutoffboundDive(), SCIPchgRowLhs(), SCIPchgRowLhsDive(), SCIPchgRowRhs(), SCIPchgRowRhsDive(), SCIPchgVarLbDive(), SCIPchgVarObjDive(), SCIPchgVarUbDive(), SCIPendDive(), SCIPgetVarLbDive(), SCIPgetVarObjDive(), SCIPgetVarUbDive(), SCIPinDive(), SCIPprimalHeuristics(), SCIPsolLinkLPSol(), SCIPsolveDiveLP(), SCIPstartDive(), SCIPstartProbing(), SCIPstartStrongbranch(), SCIPtreeCutoff(), SCIPvarChgLbDive(), and SCIPvarChgUbDive().

SCIPlpDivingObjChanged()

SCIP_Bool SCIPlpDivingObjChanged

(

SCIP_LP *

lp

)

returns whether the LP is in diving mode and the objective value of at least one column was changed

Parameters

lp	current LP data

Definition at line 17679 of file lp.c.

References SCIP_Lp::divingobjchg, and NULL.

Referenced by conflictAnalyzeBoundexceedingLP(), conflictAnalyzeInfeasibleLP(), conflictAnalyzeLP(), getFarkasProof(), runBoundHeuristic(), SCIPchgVarObjProbing(), SCIPlpSetCutoffbound(), SCIPsolLinkLPSol(), SCIPsolveDiveLP(), and SCIPtreeEndProbing().

SCIPlpMarkDivingObjChanged()

void SCIPlpMarkDivingObjChanged

(

SCIP_LP *

lp

)

marks the diving LP to have a changed objective function

Parameters

lp	current LP data

Definition at line 17689 of file lp.c.

References SCIP_Lp::diving, SCIP_Lp::divingobjchg, NULL, SCIP_Lp::probing, and TRUE.

Referenced by SCIPchgVarObjDive(), SCIPchgVarObjProbing(), and SCIPpropagateProbing().

SCIPlpUnmarkDivingObjChanged()

void SCIPlpUnmarkDivingObjChanged

(

SCIP_LP *

lp

)

marks the diving LP to not have a changed objective function anymore

Parameters

lp	current LP data

Definition at line 17700 of file lp.c.

References SCIP_Lp::diving, SCIP_Lp::divingobjchg, FALSE, NULL, and SCIP_Lp::probing.

Referenced by SCIPpropagateProbing(), and treeBacktrackProbing().

SCIPlpDivingRowsChanged()

SCIP_Bool SCIPlpDivingRowsChanged

(

SCIP_LP *

lp

)

Parameters

lp	current LP data

Definition at line 17711 of file lp.c.

References SCIP_Lp::diving, SCIP_Lp::ndivechgsides, and NULL.

Referenced by SCIPsolveDiveLP().

computeRelIntPoint()

static SCIP_RETCODE computeRelIntPoint ( SCIP_LPI *  lpi, SCIP_SET *  set, SCIP_MESSAGEHDLR *  messagehdlr, SCIP_LP *  lp, SCIP_PROB *  prob, SCIP_Bool  relaxrows, SCIP_Bool  inclobjcutoff, SCIP_Real  timelimit, int  iterlimit, SCIP_Real *  point, SCIP_Bool *  success  )

static

compute relative interior point with auxiliary lpi, see SCIPlpComputeRelIntPoint()

Parameters

lpi	auxiliary LP interface
set	global SCIP settings
messagehdlr	message handler
lp	LP data
prob	problem data
relaxrows	should the rows be relaxed
inclobjcutoff	should a row for the objective cutoff be included
timelimit	time limit for LP solver
iterlimit	iteration limit for LP solver
point	array to store relative interior point on exit
success	buffer to indicate whether interior point was successfully computed

Definition at line 17723 of file lp.c.

References SCIP_Row::cols, SCIP_Lp::cols, SCIP_Row::constant, SCIP_Lp::cutoffbound, SCIP_Lp::feastol, getFiniteLooseObjval(), SCIP_Col::lb, SCIP_Row::lhs, SCIP_Lp::looseobjvalinf, SCIP_Row::lpcolssorted, SCIP_Col::lppos, MAX, SCIP_Lp::ncols, SCIP_Row::nlpcols, SCIP_Lp::nrows, NULL, SCIP_Col::obj, REALABS, SCIP_Row::rhs, SCIP_Lp::rows, rowSortLP(), SCIP_CALL, SCIP_LPERROR, SCIP_LPPAR_DUALFEASTOL, SCIP_LPPAR_FEASTOL, SCIP_LPPAR_LPITLIM, SCIP_LPPAR_LPTILIM, SCIP_OKAY, SCIP_PARAMETERUNKNOWN, SCIP_Real, SCIPlpiAddCols(), SCIPlpiAddRows(), SCIPlpiGetNCols(), SCIPlpiGetSol(), SCIPlpiInfinity(), SCIPlpiIsIterlimExc(), SCIPlpiIsOptimal(), SCIPlpiIsTimelimExc(), SCIPlpiSetIntpar(), SCIPlpiSetRealpar(), SCIPlpiSolveDual(), SCIPlpiWriteLP(), SCIPmessagePrintWarning(), SCIProwIsModifiable(), SCIPsetAllocBufferArray, SCIPsetDebugMsg, SCIPsetDualfeastol(), SCIPsetFreeBufferArray, SCIPsetInfinity(), SCIPsetIsEQ(), SCIPsetIsFeasEQ(), SCIPsetIsFeasGE(), SCIPsetIsFeasGT(), SCIPsetIsFeasLT(), SCIPsetIsFeasZero(), SCIPsetIsInfinity(), SCIPsetIsZero(), TRUE, SCIP_Col::ub, and SCIP_Row::vals.

Referenced by SCIPlpComputeRelIntPoint().

SCIPlpComputeRelIntPoint()

SCIP_RETCODE SCIPlpComputeRelIntPoint	(	SCIP_SET *	set,
		SCIP_MESSAGEHDLR *	messagehdlr,
		SCIP_LP *	lp,
		SCIP_PROB *	prob,
		SCIP_Bool	relaxrows,
		SCIP_Bool	inclobjcutoff,
		SCIP_Real	timelimit,
		int	iterlimit,
		SCIP_Real *	point,
		SCIP_Bool *	success
	)

compute relative interior point

We use the approach of

R. Freund, R. Roundy, M. J. Todd

"Identifying the Set of Always-Active Constraints in a System of Linear Inequalities by a Single Linear Program"

Tech. Rep, No. 1674-85, Sloan School, M.I.T., 1985

to compute a relative interior point for the current LP.

Assume the original LP looks as follows:

\[ \begin{array}{rrl} \min & c^T x &\\ & A x & \geq a\\ & B x & \leq b\\ & D x & = d. \end{array} \]

Note that bounds should be included in the system.

To find an interior point the following LP does the job:

\[ \begin{array}{rrl} \max & 1^T y &\\ & A x - y - \alpha a & \geq 0\\ & B x + y - \alpha b & \leq 0\\ & D x - \alpha d & = 0\\ & 0 \leq y & \leq 1\\ & \alpha & \geq 1. \end{array} \]

If the original LP is feasible, this LP is feasible as well. Any optimal solution yields the relative interior point \(x^*_j/\alpha^*\). Note that this will just produce some relative interior point. It does not produce a particular relative interior point, e.g., one that maximizes the distance to the boundary in some norm.

Parameters

set	global SCIP settings
messagehdlr	message handler
lp	LP data
prob	problem data
relaxrows	should the rows be relaxed
inclobjcutoff	should a row for the objective cutoff be included
timelimit	time limit for LP solver
iterlimit	iteration limit for LP solver
point	array to store relative interior point on exit
success	buffer to indicate whether interior point was successfully computed

Definition at line 18425 of file lp.c.

References BMSclearMemoryArray, computeRelIntPoint(), SCIP_Lp::cutoffbound, FALSE, SCIP_Lp::looseobjval, SCIP_Lp::looseobjvalinf, SCIP_Lp::ncols, SCIP_Lp::nrows, NULL, SCIP_CALL, SCIP_INVALID, SCIP_LPERROR, SCIP_OBJSEN_MAXIMIZE, SCIP_OKAY, SCIPlpiCreate(), SCIPlpiFree(), SCIPsetDebugMsg, SCIPsetIsInfinity(), and TRUE.

Referenced by SCIPcomputeLPRelIntPoint().

SCIPlpGetDegeneracy()

SCIP_RETCODE SCIPlpGetDegeneracy	(	SCIP_LP *	lp,
		SCIP_SET *	set,
		SCIP_STAT *	stat,
		SCIP_Real *	degeneracy,
		SCIP_Real *	varconsratio
	)

computes the changes to the problem when fixing to the optimal face

returns the degeneracy rate, i.e., the number of nonbasic variables with reduced cost 0 and the variable constraint ratio, i.e., the number of unfixed variables in relation to the basis size

Parameters

lp	LP data
set	global SCIP settings
stat	problem statistics
degeneracy	pointer to store degeneracy share
varconsratio	pointer to store variable constraint ratio

Definition at line 18496 of file lp.c.

References SCIP_Lp::cols, SCIP_Lp::degeneracy, SCIP_Lp::flushed, SCIP_Lp::ncols, SCIP_Stat::nlps, SCIP_Lp::nrows, NULL, r, SCIP_Lp::rows, SCIP_BASESTAT_BASIC, SCIP_LPSOLSTAT_OPTIMAL, SCIP_OKAY, SCIP_Real, SCIPcolGetBasisStatus(), SCIPcolGetLb(), SCIPcolGetRedcost(), SCIPcolGetUb(), SCIPcolIsInLP(), SCIPlpGetSolstat(), SCIPlpIsDualReliable(), SCIProwGetBasisStatus(), SCIProwGetDualsol(), SCIProwGetLhs(), SCIProwGetLPActivity(), SCIProwGetMaxActivity(), SCIProwGetMinActivity(), SCIProwGetRhs(), SCIProwIsInLP(), SCIPsetIsDualfeasNegative(), SCIPsetIsDualfeasPositive(), SCIPsetIsEQ(), SCIPsetIsGE(), SCIPsetIsLE(), SCIPsetIsZero(), SCIP_Lp::solved, SCIP_Lp::validdegeneracylp, and SCIP_Lp::varconsratio.

Referenced by SCIPgetLPDegeneracy().

Variable Documentation

scalars

const SCIP_Real scalars[] = {3.0, 5.0, 7.0, 9.0, 11.0, 13.0, 15.0, 17.0, 19.0}

static

additional scalars that are tried in integrality scaling

Definition at line 5731 of file lp.c.

Referenced by disaggregate(), multiAggregateBinvar(), presolveAddKKTAggregatedVars(), SCIPconflictAddBound(), SCIPsolGetRayVal(), SCIPsolGetVal(), SCIPvarMultiaggregate(), and writeExpandedSolutions().

nscalars

const int nscalars = 9

static

Definition at line 5732 of file lp.c.

Referenced by SCIProwCalcIntegralScalar().