prop_genvbounds.c File Reference

Detailed Description

generalized variable bounds propagator

Author

Stefan Weltge

Ambros Gleixner

Benjamin Mueller

Definition in file prop_genvbounds.c.

#include <assert.h>
#include <string.h>
#include "scip/prop_genvbounds.h"
#include "scip/debug.h"
#include "scip/cons_linear.h"

Go to the source code of this file.

Macros
#define	PROP_NAME   "genvbounds"
#define	PROP_DESC   "generalized variable bounds propagator"
#define	PROP_TIMING   SCIP_PROPTIMING_ALWAYS
#define	PROP_PRIORITY   3000000
#define	PROP_FREQ   1
#define	PROP_DELAY   FALSE
#define	PROP_PRESOL_PRIORITY   -2000000
#define	PROP_PRESOLTIMING   SCIP_PRESOLTIMING_FAST /* timing of the presolving method (fast, medium, or exhaustive) */
#define	PROP_PRESOL_MAXROUNDS   -1
#define	DEFAULT_GLOBAL_PROPAGATION   TRUE
#define	DEFAULT_PROPAGATE_IN_ROOT_NODE   TRUE
#define	DEFAULT_SORT   TRUE
#define	DEFAULT_PROPASCONSS   FALSE
#define	EVENTHDLR_NAME   "genvbounds"
#define	EVENTHDLR_DESC   "event handler for generalized variable bounds propagator"

Typedefs
typedef struct GenVBound	GENVBOUND

Functions
static SCIP_Real	getCutoffboundGenVBound (SCIP *scip)
static GENVBOUND *	getGenVBound (SCIP *scip, SCIP_PROPDATA *propdata, SCIP_VAR *var, SCIP_BOUNDTYPE boundtype)
static SCIP_Real	getGenVBoundsMinActivity (SCIP *scip, SCIP_VAR **vars, SCIP_Real *coefs, int nvars, SCIP_Bool global)
static SCIP_Real	getGenVBoundsMinActivityConflict (SCIP *scip, SCIP_VAR **vars, SCIP_Real *coefs, int nvars, SCIP_BDCHGIDX *bdchgidx)
static SCIP_Real	getGenVBoundsBound (SCIP *scip, GENVBOUND *genvbound, SCIP_Bool global)
static SCIP_RETCODE	createStartingData (SCIP *scip, SCIP_PROPDATA *propdata)
static SCIP_RETCODE	freeStartingData (SCIP *scip, SCIP_PROPDATA *propdata)
static SCIP_RETCODE	fillGlobalStartingData (SCIP *scip, SCIP_PROPDATA *propdata)
static SCIP_RETCODE	resetLocalStartingData (SCIP *scip, SCIP_PROPDATA *propdata)
static SCIP_RETCODE	freeComponentsData (SCIP *scip, SCIP_PROPDATA *propdata)
static SCIP_RETCODE	freeGenVBound (SCIP *scip, GENVBOUND *genvbound)
static SCIP_RETCODE	resolveGenVBoundPropagation (SCIP *scip, GENVBOUND *genvbound, SCIP_BDCHGIDX *bdchgidx, SCIP_Real *boundval, SCIP_Bool *success)
static SCIP_RETCODE	analyzeGenVBoundConflict (SCIP *scip, GENVBOUND *genvbound)
static SCIP_RETCODE	applyGenVBound (SCIP *scip, SCIP_PROP *prop, GENVBOUND *genvbound, SCIP_Bool global, SCIP_RESULT *result, int *nchgbds)
static SCIP_RETCODE	freeEventData (SCIP *scip, SCIP_EVENTDATA **eventdata)
static SCIP_RETCODE	freeAllEventData (SCIP *scip, SCIP_PROPDATA *propdata)
static SCIP_RETCODE	dropAndFreeEvents (SCIP *scip, SCIP_PROPDATA *propdata)
static SCIP_RETCODE	getEventData (SCIP *scip, SCIP_PROPDATA *propdata, SCIP_VAR *var, SCIP_BOUNDTYPE boundtype, SCIP_EVENTDATA **eventdata)
static SCIP_RETCODE	addEventData (SCIP *scip, SCIP_PROPDATA *propdata, SCIP_VAR *var, int startindex, int startcomponent, SCIP_BOUNDTYPE boundtype)
static SCIP_RETCODE	setUpEvents (SCIP *scip, SCIP_PROPDATA *propdata)
static SCIP_RETCODE	sortGenVBounds (SCIP *scip, SCIP_PROPDATA *propdata)
static SCIP_RETCODE	applyGenVBounds (SCIP *scip, SCIP_PROP *prop, SCIP_Bool global, SCIP_RESULT *result, int *nchgbds)
static SCIP_RETCODE	initPropdata (SCIP *scip, SCIP_PROPDATA *propdata)
static SCIP_RETCODE	addNewGenVBound (SCIP *scip, SCIP_PROPDATA *propdata, GENVBOUND *genvbound)
static SCIP_RETCODE	execGenVBounds (SCIP *scip, SCIP_PROPDATA *propdata, SCIP_RESULT *result, SCIP_Bool local, int *nchgbds)
static SCIP_RETCODE	createConstraints (SCIP *scip, SCIP_PROPDATA *propdata)
SCIP_RETCODE	SCIPgenVBoundAdd (SCIP *scip, SCIP_PROP *genvboundprop, SCIP_VAR **vars, SCIP_VAR *var, SCIP_Real *coefs, int ncoefs, SCIP_Real coefcutoffbound, SCIP_Real constant, SCIP_BOUNDTYPE boundtype)
static	SCIP_DECL_PROPINIT (propInitGenvbounds)
static	SCIP_DECL_PROPPRESOL (propPresolGenvbounds)
static	SCIP_DECL_PROPINITPRE (propInitpreGenvbounds)
static	SCIP_DECL_PROPEXITPRE (propExitpreGenvbounds)
static	SCIP_DECL_PROPEXEC (propExecGenvbounds)
static	SCIP_DECL_PROPRESPROP (propRespropGenvbounds)
static	SCIP_DECL_PROPEXITSOL (propExitsolGenvbounds)
static	SCIP_DECL_PROPFREE (propFreeGenvbounds)
static	SCIP_DECL_EVENTEXEC (eventExecGenvbounds)
SCIP_RETCODE	SCIPincludePropGenvbounds (SCIP *scip)

Macro Definition Documentation

#define PROP_NAME   "genvbounds"

Definition at line 37 of file prop_genvbounds.c.

Referenced by SCIPgenVBoundAdd().

#define PROP_DESC   "generalized variable bounds propagator"

Definition at line 38 of file prop_genvbounds.c.

#define PROP_TIMING   SCIP_PROPTIMING_ALWAYS

Definition at line 39 of file prop_genvbounds.c.

#define PROP_PRIORITY   3000000

propagator priority

Definition at line 40 of file prop_genvbounds.c.

#define PROP_FREQ   1

propagator frequency

Definition at line 41 of file prop_genvbounds.c.

#define PROP_DELAY   FALSE

should propagation method be delayed, if other propagators found reductions?

Definition at line 42 of file prop_genvbounds.c.

#define PROP_PRESOL_PRIORITY   -2000000

priority of the presolving method (>= 0: before, < 0: after constraint handlers); combined with presolvers

Definition at line 45 of file prop_genvbounds.c.

#define PROP_PRESOLTIMING   SCIP_PRESOLTIMING_FAST /* timing of the presolving method (fast, medium, or exhaustive) */

Definition at line 48 of file prop_genvbounds.c.

#define PROP_PRESOL_MAXROUNDS   -1

maximal number of presolving rounds the presolver participates in (-1: no limit)

Definition at line 49 of file prop_genvbounds.c.

#define DEFAULT_GLOBAL_PROPAGATION   TRUE

apply global propagation?

Definition at line 52 of file prop_genvbounds.c.

#define DEFAULT_PROPAGATE_IN_ROOT_NODE   TRUE

apply genvbounds in root node if no new incumbent was found?

Definition at line 53 of file prop_genvbounds.c.

#define DEFAULT_SORT   TRUE

sort genvbounds and wait for bound change events? (otherwise all genvbounds are applied in each node)

Definition at line 54 of file prop_genvbounds.c.

#define DEFAULT_PROPASCONSS   FALSE

should genvbounds be transformed to (linear) constraints?

Definition at line 57 of file prop_genvbounds.c.

#define EVENTHDLR_NAME   "genvbounds"

Definition at line 59 of file prop_genvbounds.c.

#define EVENTHDLR_DESC   "event handler for generalized variable bounds propagator"

Definition at line 60 of file prop_genvbounds.c.

Typedef Documentation

typedef struct GenVBound GENVBOUND

Definition at line 81 of file prop_genvbounds.c.

Function Documentation

static SCIP_Real getCutoffboundGenVBound ( SCIP *  scip )

static

returns correct cutoff bound value

Parameters

scip	SCIP data structure

Definition at line 143 of file prop_genvbounds.c.

Referenced by createConstraints(), getGenVBoundsBound(), and resolveGenVBoundPropagation().

static GENVBOUND* getGenVBound ( SCIP *  scip, SCIP_PROPDATA *  propdata, SCIP_VAR *  var, SCIP_BOUNDTYPE  boundtype  )

static

returns corresponding genvbound in genvboundstore if there is one, NULL otherwise

Parameters

scip	SCIP data structure
propdata	data of the genvbounds propagator
var	bounds variable
boundtype	bounds type

Definition at line 164 of file prop_genvbounds.c.

References GenVBound::boundtype, GenVBound::coefs, GenVBound::constant, GenVBound::cutoffcoef, FALSE, getGenVBoundsMinActivity(), GenVBound::ncoefs, NULL, SCIP_Bool, SCIP_BOUNDTYPE_LOWER, SCIP_BOUNDTYPE_UPPER, SCIP_Real, SCIPdebugPrintf, SCIPhashmapGetImage(), SCIPisZero(), SCIPvarGetName(), TRUE, GenVBound::var, and GenVBound::vars.

Referenced by addNewGenVBound(), and SCIPgenVBoundAdd().

static SCIP_Real getGenVBoundsMinActivity ( SCIP *  scip, SCIP_VAR **  vars, SCIP_Real *  coefs, int  nvars, SCIP_Bool  global  )

static

calculates the minactivity of a linear combination of variables stored in an array

Parameters

scip	SCIP data structure
vars	array of variables
coefs	array of coefficients
nvars	number of variables
global	use global variable bounds?

Definition at line 231 of file prop_genvbounds.c.

References GenVBound::coefs, getGenVBoundsMinActivityConflict(), NULL, SCIP_Real, SCIPinfinity(), SCIPisInfinity(), SCIPvarGetLbGlobal(), SCIPvarGetLbLocal(), SCIPvarGetUbGlobal(), SCIPvarGetUbLocal(), and GenVBound::vars.

Referenced by getGenVBound(), and getGenVBoundsBound().

static SCIP_Real getGenVBoundsMinActivityConflict ( SCIP *  scip, SCIP_VAR **  vars, SCIP_Real *  coefs, int  nvars, SCIP_BDCHGIDX *  bdchgidx  )

static

calculates the minactivity of a linear combination of variables stored in the current conflict set

Parameters

scip	SCIP data structure
vars	array of variables
coefs	array of coefficients
nvars	number of variables
bdchgidx	bound change at which minactivity should be computed; if NULL use local bounds

Definition at line 272 of file prop_genvbounds.c.

References getGenVBoundsBound(), NULL, SCIP_Bool, SCIP_Real, SCIPgetConflictVarLb(), SCIPgetConflictVarUb(), SCIPinfinity(), SCIPisEQ(), SCIPisInfinity(), SCIPisZero(), SCIPvarGetLbAtIndex(), SCIPvarGetLbLocal(), SCIPvarGetUbAtIndex(), SCIPvarGetUbLocal(), and TRUE.

Referenced by getGenVBoundsMinActivity(), and resolveGenVBoundPropagation().

static SCIP_Real getGenVBoundsBound ( SCIP *  scip, GENVBOUND *  genvbound, SCIP_Bool  global  )

static

returns a valid bound given by a generalized variable bound

Parameters

scip	SCIP data structure
genvbound	generalized variable bound
global	use global variable bounds?

Definition at line 334 of file prop_genvbounds.c.

References GenVBound::boundtype, GenVBound::coefs, GenVBound::constant, createStartingData(), GenVBound::cutoffcoef, getCutoffboundGenVBound(), getGenVBoundsMinActivity(), GenVBound::ncoefs, NULL, SCIP_BOUNDTYPE_LOWER, SCIP_BOUNDTYPE_UPPER, SCIP_CALL, SCIP_INVALID, SCIP_OKAY, SCIP_Real, SCIP_UNKNOWN, SCIPdebugCheckLbGlobal, SCIPdebugCheckUbGlobal, SCIPdebugGetSolVal, SCIPgetSolTransObj(), SCIPgetTransObjoffset(), SCIPgetTransObjscale(), SCIPinfinity(), SCIPisInfinity(), GenVBound::var, and GenVBound::vars.

Referenced by applyGenVBound(), and getGenVBoundsMinActivityConflict().

static SCIP_RETCODE createStartingData ( SCIP *  scip, SCIP_PROPDATA *  propdata  )

static

allocate local and global startindices, startcomponents and startmap

Parameters

scip	SCIP data structure
propdata	data of the genvbounds propagator

Definition at line 416 of file prop_genvbounds.c.

References freeStartingData(), NULL, SCIP_CALL, SCIP_OKAY, SCIPallocMemoryArray, SCIPblkmem(), SCIPcalcHashtableSize(), SCIPdebugMessage, and SCIPhashmapCreate().

Referenced by execGenVBounds(), and getGenVBoundsBound().

static SCIP_RETCODE freeStartingData ( SCIP *  scip, SCIP_PROPDATA *  propdata  )

static

free local and global startindices, startcomponents and startmap

Parameters

scip	SCIP data structure
propdata	data of the genvbounds propagator

Definition at line 455 of file prop_genvbounds.c.

References fillGlobalStartingData(), NULL, SCIP_OKAY, SCIPdebugMessage, SCIPfreeMemoryArray, and SCIPhashmapFree().

Referenced by createConstraints(), createStartingData(), and execGenVBounds().

static SCIP_RETCODE fillGlobalStartingData ( SCIP *  scip, SCIP_PROPDATA *  propdata  )

static

Parameters

scip	SCIP data structure
propdata	data of the genvbounds propagator

Definition at line 498 of file prop_genvbounds.c.

References NULL, resetLocalStartingData(), SCIP_CALL, SCIP_OKAY, SCIPdebugMessage, SCIPisNegative(), SCIPisZero(), and SCIPreallocMemoryArray.

Referenced by execGenVBounds(), and freeStartingData().

static SCIP_RETCODE resetLocalStartingData ( SCIP *  scip, SCIP_PROPDATA *  propdata  )

static

resets local starting data

Parameters

scip	SCIP data structure
propdata	data of the genvbounds propagator

Definition at line 546 of file prop_genvbounds.c.

References freeComponentsData(), NULL, SCIP_CALL, SCIP_OKAY, and SCIPhashmapRemoveAll().

Referenced by applyGenVBounds(), and fillGlobalStartingData().

static SCIP_RETCODE freeComponentsData ( SCIP *  scip, SCIP_PROPDATA *  propdata  )

static

frees sorted components data

Parameters

scip	SCIP data structure
propdata	data of the genvbounds propagator

Definition at line 566 of file prop_genvbounds.c.

References freeGenVBound(), NULL, SCIP_OKAY, SCIPdebugMessage, and SCIPfreeMemoryArray.

Referenced by createConstraints(), execGenVBounds(), and resetLocalStartingData().

static SCIP_RETCODE freeGenVBound ( SCIP *  scip, GENVBOUND *  genvbound  )

static

frees memory allocated for a generalized variable bound

Definition at line 592 of file prop_genvbounds.c.

References GenVBound::coefs, NULL, resolveGenVBoundPropagation(), SCIP_OKAY, SCIPfreeMemory, SCIPfreeMemoryArray, and GenVBound::vars.

Referenced by createConstraints(), and freeComponentsData().

static SCIP_RETCODE resolveGenVBoundPropagation ( SCIP *  scip, GENVBOUND *  genvbound, SCIP_BDCHGIDX *  bdchgidx, SCIP_Real *  boundval, SCIP_Bool *  success  )

static

resolves propagation of lower bound on +/- left-hand side variable of a generalized variable bound

Parameters

scip	SCIP data structure
genvbound	genvbound data structure
bdchgidx	the index of the bound change, representing the point of time where the change took place
boundval	pointer to lower bound value on +/- left-hand side variable
success	was the explanation succesful?

Definition at line 612 of file prop_genvbounds.c.

References analyzeGenVBoundConflict(), GenVBound::boundtype, GenVBound::coefs, GenVBound::constant, GenVBound::cutoffcoef, FALSE, getCutoffboundGenVBound(), getGenVBoundsMinActivityConflict(), MAX, GenVBound::ncoefs, NULL, SCIP_BOUNDTYPE_LOWER, SCIP_BOUNDTYPE_UPPER, SCIP_CALL, SCIP_OKAY, SCIP_Real, SCIPaddConflictRelaxedLb(), SCIPaddConflictRelaxedUb(), SCIPdebugMessage, SCIPfeasCeil(), SCIPgetConflictVarLb(), SCIPgetConflictVarUb(), SCIPisEQ(), SCIPisGE(), SCIPisGT(), SCIPisLE(), SCIPisLT(), SCIPisPositive(), SCIPisZero(), SCIPvarGetLbAtIndex(), SCIPvarGetLbGlobal(), SCIPvarGetLbLocal(), SCIPvarGetName(), SCIPvarGetUbAtIndex(), SCIPvarGetUbGlobal(), SCIPvarGetUbLocal(), SCIPvarIsIntegral(), TRUE, GenVBound::var, and GenVBound::vars.

Referenced by analyzeGenVBoundConflict(), and freeGenVBound().

static SCIP_RETCODE analyzeGenVBoundConflict ( SCIP *  scip, GENVBOUND *  genvbound  )

static

create initial conflict

Parameters

scip	SCIP data structure
genvbound	genvbound data structure

Definition at line 831 of file prop_genvbounds.c.

References applyGenVBound(), GenVBound::boundtype, MAX, NULL, REALABS, resolveGenVBoundPropagation(), SCIP_Bool, SCIP_BOUNDTYPE_LOWER, SCIP_CALL, SCIP_OKAY, SCIP_Real, SCIPaddConflictRelaxedLb(), SCIPaddConflictRelaxedUb(), SCIPanalyzeConflict(), SCIPdebugMessage, SCIPfeastol(), SCIPgetConflictVarLb(), SCIPgetConflictVarUb(), SCIPinitConflictAnalysis(), SCIPisConflictAnalysisApplicable(), SCIPisFeasGT(), SCIPisFeasLT(), SCIPisGE(), SCIPisLE(), SCIPvarGetLbLocal(), SCIPvarGetName(), SCIPvarGetUbLocal(), and GenVBound::var.

Referenced by applyGenVBound(), and resolveGenVBoundPropagation().

static SCIP_RETCODE applyGenVBound ( SCIP *  scip, SCIP_PROP *  prop, GENVBOUND *  genvbound, SCIP_Bool  global, SCIP_RESULT *  result, int *  nchgbds  )

static

apply propagation for one generalized variable bound; also if the left-hand side variable is locally fixed, we compute the right-hand side minactivity to possibly detect infeasibility

Parameters

scip	SCIP data structure
prop	genvbounds propagator
genvbound	genvbound data structure
global	apply global bound changes? (global: true, local: false)
result	result pointer
nchgbds	counter to increment if bound was tightened

Definition at line 963 of file prop_genvbounds.c.

References analyzeGenVBoundConflict(), GenVBound::boundtype, FALSE, freeEventData(), getGenVBoundsBound(), GenVBound::index, GenVBound::ncoefs, NULL, REALABS, SCIP_Bool, SCIP_BOUNDTYPE_LOWER, SCIP_BOUNDTYPE_UPPER, SCIP_CALL, SCIP_CUTOFF, SCIP_DIDNOTRUN, SCIP_OKAY, SCIP_Real, SCIP_REDUCEDDOM, SCIP_STAGE_PRESOLVING, SCIP_SUCCESS, SCIP_VARSTATUS_MULTAGGR, SCIPdebugMessage, SCIPdebugPrintf, SCIPgetStage(), SCIPinferVarLbProp(), SCIPinferVarUbProp(), SCIPisInfinity(), SCIPtightenVarLbGlobal(), SCIPtightenVarUbGlobal(), SCIPvarGetLbGlobal(), SCIPvarGetLbLocal(), SCIPvarGetName(), SCIPvarGetStatus(), SCIPvarGetUbGlobal(), SCIPvarGetUbLocal(), and GenVBound::var.

Referenced by analyzeGenVBoundConflict(), and applyGenVBounds().

static SCIP_RETCODE freeEventData ( SCIP *  scip, SCIP_EVENTDATA **  eventdata  )

static

frees event data

Parameters

scip	SCIP data structure
eventdata	event data to be freed

Definition at line 1097 of file prop_genvbounds.c.

References freeAllEventData(), NULL, SCIP_OKAY, SCIPfreeMemory, and SCIPfreeMemoryArray.

Referenced by applyGenVBound(), and freeAllEventData().

static SCIP_RETCODE freeAllEventData ( SCIP *  scip, SCIP_PROPDATA *  propdata  )

static

frees all eventdata stored

Parameters

scip	SCIP data structure
propdata	data of the genvbounds propagator

Definition at line 1120 of file prop_genvbounds.c.

References dropAndFreeEvents(), freeEventData(), NULL, SCIP_CALL, SCIP_OKAY, SCIPfreeMemoryArray, and SCIPhashmapFree().

Referenced by dropAndFreeEvents(), and freeEventData().

static SCIP_RETCODE dropAndFreeEvents ( SCIP *  scip, SCIP_PROPDATA *  propdata  )

static

drops all events caught by genvbounds propagator and frees their data

Parameters

scip	SCIP data structure
propdata	data of the genvbounds propagator

Definition at line 1167 of file prop_genvbounds.c.

References freeAllEventData(), getEventData(), NULL, SCIP_CALL, SCIP_EVENTTYPE_LBTIGHTENED, SCIP_EVENTTYPE_UBTIGHTENED, SCIP_OKAY, SCIPdebugMessage, SCIPdropVarEvent(), and GenVBound::var.

Referenced by createConstraints(), execGenVBounds(), and freeAllEventData().

static SCIP_RETCODE getEventData ( SCIP *  scip, SCIP_PROPDATA *  propdata, SCIP_VAR *  var, SCIP_BOUNDTYPE  boundtype, SCIP_EVENTDATA **  eventdata  )

static

returns the corresponding event data entry in the corresponding array, if there is one; if not: allocates a new event data entry, stores it in the array and returns its adress

Parameters

scip	SCIP data structure
propdata	data of the genvbounds propagator
var	variable
boundtype	type of bound
eventdata	event data to return

Definition at line 1216 of file prop_genvbounds.c.

References addEventData(), NULL, SCIP_BOUNDTYPE_LOWER, SCIP_CALL, SCIP_OKAY, SCIPallocMemory, SCIPallocMemoryArray, SCIPhashmapExists(), SCIPhashmapGetImage(), SCIPhashmapInsert(), and GenVBound::var.

Referenced by addEventData(), and dropAndFreeEvents().

static SCIP_RETCODE addEventData ( SCIP *  scip, SCIP_PROPDATA *  propdata, SCIP_VAR *  var, int  startindex, int  startcomponent, SCIP_BOUNDTYPE  boundtype  )

static

adds an event to the event array lbevents (if boundtype == SCIP_BOUNDTYPE_LOWER) or ubevents (if boundtype == SCIP_BOUNDTYPE_UPPER)

Parameters

scip	SCIP data structure
propdata	data of the genvbounds propagator
var	variable thats event to be added
startindex	starting index
startcomponent	starting components index
boundtype	type of bound

Definition at line 1267 of file prop_genvbounds.c.

References getEventData(), NULL, SCIP_CALL, SCIP_OKAY, and setUpEvents().

Referenced by getEventData(), and setUpEvents().

static SCIP_RETCODE setUpEvents ( SCIP *  scip, SCIP_PROPDATA *  propdata  )

static

Parameters

scip	SCIP data structure
propdata	data of the genvbounds propagator

Definition at line 1310 of file prop_genvbounds.c.

References addEventData(), GenVBound::coefs, GenVBound::ncoefs, NULL, SCIP_BOUNDTYPE_LOWER, SCIP_BOUNDTYPE_UPPER, SCIP_CALL, SCIP_EVENTTYPE_LBTIGHTENED, SCIP_EVENTTYPE_UBTIGHTENED, SCIP_OKAY, SCIPallocMemoryArray, SCIPblkmem(), SCIPcalcHashtableSize(), SCIPcatchVarEvent(), SCIPdebugMessage, SCIPgetNFixedVars(), SCIPgetNVars(), SCIPhashmapCreate(), SCIPisPositive(), SCIPreallocMemoryArray, sortGenVBounds(), and GenVBound::vars.

Referenced by addEventData(), and execGenVBounds().

static SCIP_RETCODE sortGenVBounds ( SCIP *  scip, SCIP_PROPDATA *  propdata  )

static

performs a topological sort on genvboundstore array

The genvbounds graph is defined as follows: Given two genvbounds

(genvbound1) c1 * x_i1 >= RHS1

and

(genvbound2) c2 * x_i2 >= RHS2,

there is an arc from genvbound1 to genvbound2 iff c1 = +1 and x_i1 appears with positive coefficient in RHS2 or c1 = -1 and x_i1 appears with negative coefficient in RHS2; in this case, a bound change of x_i1 deduced from genvbound1 improves genvbound2's minactivity in RHS2.

The method computes the strongly connected components and sorts them topologically. The order of the nodes in an strongly connected component is arbitrary.

Parameters

scip	SCIP data structure
propdata	data of the genvbounds propagator

Definition at line 1434 of file prop_genvbounds.c.

References applyGenVBounds(), GenVBound::coefs, GenVBound::index, GenVBound::ncoefs, NULL, SCIP_Bool, SCIP_CALL, SCIP_OKAY, SCIPallocMemoryArray, SCIPdebugMessage, SCIPdigraphAddArc(), SCIPdigraphComputeDirectedComponents(), SCIPdigraphComputeUndirectedComponents(), SCIPdigraphCreate(), SCIPdigraphFree(), SCIPdigraphGetComponent(), SCIPdigraphGetNComponents(), SCIPdigraphGetNNodes(), SCIPdigraphTopoSortComponents(), SCIPfreeMemoryArray, SCIPhashmapExists(), SCIPhashmapGetImage(), SCIPisNegative(), SCIPisPositive(), TRUE, and GenVBound::vars.

Referenced by execGenVBounds(), and setUpEvents().

static SCIP_RETCODE applyGenVBounds ( SCIP *  scip, SCIP_PROP *  prop, SCIP_Bool  global, SCIP_RESULT *  result, int *  nchgbds  )

static

apply propagation of generalized variable bounds

Parameters

scip	SCIP data structure
prop	genvbounds propagator
global	use global variable bounds for propagation?
result	result pointer
nchgbds	counter to increase by the number of changed bounds

Definition at line 1583 of file prop_genvbounds.c.

References applyGenVBound(), initPropdata(), NULL, resetLocalStartingData(), SCIP_CALL, SCIP_CUTOFF, SCIP_DIDNOTFIND, SCIP_DIDNOTRUN, SCIP_OKAY, SCIP_VARSTATUS_MULTAGGR, SCIPdebugMessage, SCIPgetDepth(), SCIPinProbing(), SCIPpropGetData(), and SCIPvarGetStatus().

Referenced by execGenVBounds(), and sortGenVBounds().

static SCIP_RETCODE initPropdata ( SCIP *  scip, SCIP_PROPDATA *  propdata  )

static

initialize propagator data

Parameters

scip	SCIP data structure
propdata	data of the genvbounds propagator

Definition at line 1674 of file prop_genvbounds.c.

References addNewGenVBound(), BMSclearMemoryArray, NULL, SCIP_CALL, SCIP_OKAY, SCIPallocMemoryArray, SCIPblkmem(), SCIPcalcHashtableSize(), SCIPdebugMessage, SCIPgetNVars(), and SCIPhashmapCreate().

Referenced by applyGenVBounds(), and SCIPgenVBoundAdd().

static SCIP_RETCODE addNewGenVBound ( SCIP *  scip, SCIP_PROPDATA *  propdata, GENVBOUND *  genvbound  )

static

adds a new genvbound to genvboundstore array and sets a hashmap entry

Parameters

scip	SCIP data structure
propdata	data of the genvbounds propagator
genvbound	genvbound to be added

Definition at line 1703 of file prop_genvbounds.c.

References execGenVBounds(), getGenVBound(), NULL, SCIP_BOUNDTYPE_LOWER, SCIP_CALL, SCIP_OKAY, SCIPhashmapInsert(), and SCIPreallocMemoryArray.

Referenced by initPropdata(), and SCIPgenVBoundAdd().

static SCIP_RETCODE execGenVBounds ( SCIP *  scip, SCIP_PROPDATA *  propdata, SCIP_RESULT *  result, SCIP_Bool  local, int *  nchgbds  )

static

runs propagation routine

Parameters

scip	SCIP data structure
propdata	data of the genvbounds propagator
result	result pointer
local	should local propagation be applied?
nchgbds	counter to increase by the number of changed bounds

Definition at line 1742 of file prop_genvbounds.c.

References applyGenVBounds(), createConstraints(), createStartingData(), dropAndFreeEvents(), FALSE, fillGlobalStartingData(), freeComponentsData(), freeStartingData(), NULL, SCIP_CALL, SCIP_CUTOFF, SCIP_DIDNOTFIND, SCIP_DIDNOTRUN, SCIP_OKAY, SCIPdebugMessage, SCIPgetCurrentNode(), SCIPgetCutoffbound(), SCIPgetDepth(), SCIPinProbing(), SCIPisFeasLT(), setUpEvents(), sortGenVBounds(), and TRUE.

Referenced by addNewGenVBound().

static SCIP_RETCODE createConstraints ( SCIP *  scip, SCIP_PROPDATA *  propdata  )

static

Parameters

scip	SCIP data structure
propdata	data of the genvbounds propagator

Definition at line 1821 of file prop_genvbounds.c.

References GenVBound::boundtype, GenVBound::coefs, GenVBound::constant, GenVBound::cutoffcoef, dropAndFreeEvents(), FALSE, freeComponentsData(), freeGenVBound(), freeStartingData(), getCutoffboundGenVBound(), GenVBound::index, GenVBound::ncoefs, NULL, SCIP_BOUNDTYPE_LOWER, SCIP_CALL, SCIP_MAXSTRLEN, SCIP_OKAY, SCIP_Real, SCIP_VARTYPE_CONTINUOUS, SCIPaddCons(), SCIPaddVar(), SCIPaddVarLocks(), SCIPallocBufferArray, SCIPcreateConsLinear(), SCIPcreateVarBasic(), SCIPdebugMessage, SCIPdebugPrintf, SCIPfreeBufferArray, SCIPfreeMemoryArray, SCIPgenVBoundAdd(), SCIPhashmapFree(), SCIPinfinity(), SCIPmarkDoNotMultaggrVar(), SCIPreleaseCons(), SCIPsnprintf(), SCIPvarGetName(), TRUE, GenVBound::var, and GenVBound::vars.

Referenced by execGenVBounds().

SCIP_RETCODE SCIPgenVBoundAdd	(	SCIP *	scip,
		SCIP_PROP *	genvboundprop,
		SCIP_VAR **	vars,
		SCIP_VAR *	var,
		SCIP_Real *	coefs,
		int	ncoefs,
		SCIP_Real	coefcutoffbound,
		SCIP_Real	constant,
		SCIP_BOUNDTYPE	boundtype
	)

adds a generalized variable bound to the genvbounds propagator; if there is already a genvbound for the bound "boundtype" of variable "var", it will be replaced

Parameters

scip	SCIP data structure
genvboundprop	genvbound propagator
vars	array of RHSs variables
var	LHSs variable
coefs	array of coefficients for the RHSs variables
ncoefs	size of coefs array
coefcutoffbound	nonpositive value of the cutoff bounds multiplier
constant	constant term
boundtype	type of bound provided by the genvbound

Definition at line 1952 of file prop_genvbounds.c.

References addNewGenVBound(), GenVBound::boundtype, GenVBound::coefs, GenVBound::constant, GenVBound::cutoffcoef, FALSE, getGenVBound(), initPropdata(), GenVBound::ncoefs, NULL, PROP_NAME, SCIP_Bool, SCIP_CALL, SCIP_DECL_PROPINIT(), SCIP_INVALIDDATA, SCIP_OKAY, SCIPallocMemory, SCIPdebug, SCIPdebugMessage, SCIPduplicateMemoryArray, SCIPerrorMessage, SCIPfreeMemoryArray, SCIPgetTransObjoffset(), SCIPgetTransObjscale(), SCIPisInfinity(), SCIPisNegative(), SCIPisPositive(), SCIPpropGetData(), SCIPpropGetName(), SCIPreallocMemoryArray, GenVBound::var, and GenVBound::vars.

Referenced by createConstraints().

static SCIP_DECL_PROPINIT ( propInitGenvbounds  )

static

initialization method of propagator (called after problem was transformed)

Definition at line 2103 of file prop_genvbounds.c.

Referenced by SCIPgenVBoundAdd().

static SCIP_DECL_PROPPRESOL ( propPresolGenvbounds  )

static

presolving method of propagator

Definition at line 2148 of file prop_genvbounds.c.

static SCIP_DECL_PROPINITPRE ( propInitpreGenvbounds  )

static

presolving initialization method of propagator (called when presolving is about to begin)

Definition at line 2183 of file prop_genvbounds.c.

static SCIP_DECL_PROPEXITPRE ( propExitpreGenvbounds  )

static

presolving deinitialization method of propagator (called after presolving has been finished)

Definition at line 2211 of file prop_genvbounds.c.

static SCIP_DECL_PROPEXEC ( propExecGenvbounds  )

static

execution method of propagator

Definition at line 2290 of file prop_genvbounds.c.

static SCIP_DECL_PROPRESPROP ( propRespropGenvbounds  )

static

propagation conflict resolving method of propagator

Definition at line 2370 of file prop_genvbounds.c.

static SCIP_DECL_PROPEXITSOL ( propExitsolGenvbounds  )

static

solving process deinitialization method of propagator (called before branch and bound process data is freed)

Definition at line 2439 of file prop_genvbounds.c.

static SCIP_DECL_PROPFREE ( propFreeGenvbounds  )

static

destructor of propagator to free user data (called when SCIP is exiting)

Definition at line 2496 of file prop_genvbounds.c.

static SCIP_DECL_EVENTEXEC ( eventExecGenvbounds  )

static

Definition at line 2519 of file prop_genvbounds.c.

SCIP_RETCODE SCIPincludePropGenvbounds

(

SCIP *

scip

)

creates the genvbounds propagator and includes it in SCIP

Parameters

scip	SCIP data structure

Definition at line 2602 of file prop_genvbounds.c.

Referenced by SCIPincludeDefaultPlugins().