Detailed Description

Constraint handler for logic or constraints $1^T x \ge 1$ (equivalent to set covering, but algorithms are suited for depth first search).

Author: Tobias Achterberg; Michael Winkler

Definition in file cons_logicor.c.

#include <assert.h>
#include <string.h>
#include <limits.h>
#include "scip/cons_logicor.h"
#include "scip/cons_linear.h"
#include "scip/cons_setppc.h"
#include "scip/pub_misc.h"

Go to the source code of this file.

Macros
#define	CONSHDLR_NAME "logicor"

#define	CONSHDLR_DESC "logic or constraints"

#define	CONSHDLR_SEPAPRIORITY +10000

#define	CONSHDLR_ENFOPRIORITY -2000000

#define	CONSHDLR_CHECKPRIORITY -2000000

#define	CONSHDLR_SEPAFREQ 0

#define	CONSHDLR_PROPFREQ 1

#define	CONSHDLR_EAGERFREQ 100

#define	CONSHDLR_MAXPREROUNDS -1

#define	CONSHDLR_DELAYSEPA FALSE

#define	CONSHDLR_DELAYPROP FALSE

#define	CONSHDLR_NEEDSCONS TRUE

#define	CONSHDLR_PRESOLTIMING SCIP_PRESOLTIMING_ALWAYS

#define	CONSHDLR_PROP_TIMING SCIP_PROPTIMING_BEFORELP

#define	LINCONSUPGD_PRIORITY +800000

#define	EVENTHDLR_NAME "logicor"

#define	EVENTHDLR_DESC "event handler for logic or constraints"

#define	CONFLICTHDLR_NAME "logicor"

#define	CONFLICTHDLR_DESC "conflict handler creating logic or constraints"

#define	CONFLICTHDLR_PRIORITY LINCONSUPGD_PRIORITY

#define	DEFAULT_PRESOLPAIRWISE TRUE

#define	DEFAULT_STRENGTHEN TRUE

#define	HASHSIZE_LOGICORCONS 131101

#define	DEFAULT_PRESOLUSEHASHING TRUE

#define	DEFAULT_DUALPRESOLVING TRUE

#define	DEFAULT_NEGATEDCLIQUE TRUE

#define	DEFAULT_IMPLICATIONS TRUE

#define	AGEINCREASE(n) (1.0 + 0.2 * (n))

#define	HASHTABLESIZE_FACTOR 5

#define	MAX_CONSLENGTH 200

#define	MAXCOMPARISONS 1000000

Functions
static SCIP_RETCODE	lockRounding (SCIP scip, SCIP_CONS cons, SCIP_VAR *var)

static SCIP_RETCODE	unlockRounding (SCIP scip, SCIP_CONS cons, SCIP_VAR *var)

static SCIP_RETCODE	conshdlrdataCreate (SCIP scip, SCIP_CONSHDLRDATA conshdlrdata, SCIP_EVENTHDLR eventhdlr)

static SCIP_RETCODE	conshdlrdataFree (SCIP scip, SCIP_CONSHDLRDATA *conshdlrdata)

static SCIP_RETCODE	consdataEnsureVarsSize (SCIP scip, SCIP_CONSDATA consdata, int num)

static SCIP_RETCODE	consdataCreate (SCIP scip, SCIP_CONSDATA consdata, int nvars, SCIP_VAR *vars)

static SCIP_RETCODE	consdataFree (SCIP scip, SCIP_CONSDATA *consdata)

static SCIP_RETCODE	consdataPrint (SCIP scip, SCIP_CONSDATA consdata, FILE *file, SCIP_Bool endline)

static SCIP_RETCODE	switchWatchedvars (SCIP scip, SCIP_CONS cons, SCIP_EVENTHDLR *eventhdlr, int watchedvar1, int watchedvar2)

static SCIP_RETCODE	addCoef (SCIP scip, SCIP_CONS cons, SCIP_VAR *var)

static SCIP_RETCODE	delCoefPos (SCIP scip, SCIP_CONS cons, SCIP_EVENTHDLR *eventhdlr, int pos)

static SCIP_RETCODE	dualPresolving (SCIP scip, SCIP_CONS cons, SCIP_EVENTHDLR eventhdlr, int nfixedvars, int ndelconss, int nchgcoefs, SCIP_RESULT *result)

static SCIP_RETCODE	applyFixings (SCIP scip, SCIP_CONS cons, SCIP_EVENTHDLR eventhdlr, SCIP_Bool redundant, int nchgcoefs, int naddconss, int *ndelconss)

static SCIP_RETCODE	analyzeConflict (SCIP scip, SCIP_CONS cons)

static SCIP_RETCODE	disableCons (SCIP scip, SCIP_CONS cons)

static SCIP_RETCODE	mergeMultiples (SCIP scip, SCIP_CONS cons, SCIP_EVENTHDLR eventhdlr, unsigned char entries, int nentries, SCIP_Bool redundant, int nchgcoefs)

static SCIP_RETCODE	processWatchedVars (SCIP scip, SCIP_CONS cons, SCIP_EVENTHDLR eventhdlr, SCIP_Bool cutoff, SCIP_Bool reduceddom, SCIP_Bool addcut, SCIP_Bool *mustcheck)

static SCIP_RETCODE	checkCons (SCIP scip, SCIP_CONS cons, SCIP_SOL sol, SCIP_Bool violated)

static SCIP_RETCODE	createRow (SCIP scip, SCIP_CONS cons)

static SCIP_RETCODE	addCut (SCIP scip, SCIP_CONS cons, SCIP_SOL sol, SCIP_Bool cutoff)

static SCIP_RETCODE	separateCons (SCIP scip, SCIP_CONS cons, SCIP_SOL sol, SCIP_EVENTHDLR eventhdlr, SCIP_Bool cutoff, SCIP_Bool separated, SCIP_Bool *reduceddom)

static SCIP_RETCODE	enforcePseudo (SCIP scip, SCIP_CONS cons, SCIP_EVENTHDLR eventhdlr, SCIP_Bool cutoff, SCIP_Bool infeasible, SCIP_Bool reduceddom, SCIP_Bool *solvelp)

static void	consdataSort (SCIP_CONSDATA *consdata)

static	SCIP_DECL_HASHGETKEY (hashGetKeyLogicorcons)

static	SCIP_DECL_HASHKEYEQ (hashKeyEqLogicorcons)

static	SCIP_DECL_HASHKEYVAL (hashKeyValLogicorcons)

static SCIP_RETCODE	detectRedundantConstraints (SCIP scip, BMS_BLKMEM blkmem, SCIP_CONS *conss, int nconss, int firstchange, int *ndelconss)

static SCIP_RETCODE	removeRedundantCons (SCIP scip, SCIP_CONS cons0, SCIP_CONS cons1, int ndelconss)

static unsigned int	calcSignature (SCIP_VAR **vars, int nvars)

static void	consdataCalcSignature (SCIP_CONSDATA *consdata)

static void	removeConsFromOccurList (SCIP_CONS cons, SCIP_HASHMAP varstopos, SCIP_CONS **occurlist, int noccurlistentries, int occurlistlength)

static void	findShortestOccurlist (SCIP_VAR *vars, int nvars, SCIP_HASHMAP varstopos, SCIP_CONS **occurlist, int noccurlistentries, int occurlistlength, int nentries, SCIP_CONS **shortestlist)

static SCIP_RETCODE	removeRedundantConss (SCIP scip, SCIP_CONS cons, SCIP_HASHMAP varstopos, SCIP_CONS *occurlist, int noccurlistentries, int occurlistlength, int *ndelconss)

static	SCIP_DECL_SORTPTRCOMP (conssLogicorComp)

static SCIP_RETCODE	addConsToOccurList (SCIP scip, SCIP_CONS cons, SCIP_HASHMAP varstopos, SCIP_CONS *occurlist, int noccurlistentries, int occurlistsizes, int occurlistlength, int occurlistsize)

static SCIP_RETCODE	removeRedundantNonZeros (SCIP scip, SCIP_CONS cons, SCIP_VAR artvar, int artpos, SCIP_HASHMAP varstopos, SCIP_CONS **occurlist, int noccurlistentries, int occurlistlength, SCIP_EVENTHDLR eventhdlr, int nchgcoefs, SCIP_Bool *deleted)

static SCIP_RETCODE	strengthenConss (SCIP scip, SCIP_CONS conss, int nconss, SCIP_HASHMAP varstopos, SCIP_CONS **occurlist, int noccurlistentries, int occurlistlength, SCIP_EVENTHDLR eventhdlr, int ndelconss, int *nchgcoefs)

static SCIP_RETCODE	prepareCons (SCIP scip, SCIP_CONS cons, SCIP_EVENTHDLR eventhdlr, unsigned char entries, int nentries, SCIP_Bool redundant, int nfixedvars, int nchgcoefs, int ndelconss, SCIP_Bool *cutoff)

static SCIP_RETCODE	removeRedundantConssAndNonzeros (SCIP scip, SCIP_CONS conss, int nconss, unsigned char entries, int nentries, SCIP_EVENTHDLR eventhdlr, SCIP_Bool usestrengthening, int firstchange, int nfixedvars, int ndelconss, int nchgcoefs, SCIP_Bool cutoff)

static SCIP_RETCODE	shortenConss (SCIP scip, SCIP_CONSHDLRDATA conshdlrdata, SCIP_EVENTHDLR eventhdlr, SCIP_CONS conss, int nconss, unsigned char entries, int nentries, int nfixedvars, int ndelconss, int nchgcoefs, SCIP_Bool cutoff)

static SCIP_RETCODE	removeConstraintsDueToNegCliques (SCIP scip, SCIP_CONSHDLR conshdlr, SCIP_CONSHDLR conshdlrsetppc, SCIP_EVENTHDLR eventhdlr, SCIP_CONS conss, int nconss, unsigned char entries, int nentries, int nfixedvars, int ndelconss, int nupgdconss, int nchgcoefs, SCIP_Bool cutoff)

static SCIP_RETCODE	fixDeleteOrUpgradeCons (SCIP scip, SCIP_CONS cons, SCIP_EVENTHDLR eventhdlr, SCIP_CONSHDLR conshdlrlinear, SCIP_CONSHDLR conshdlrsetppc, int nfixedvars, int nchgbds, int nchgcoefs, int ndelconss, int naddconss, int nupgdconss, SCIP_Bool cutoff)

static SCIP_RETCODE	createNormalizedLogicor (SCIP scip, SCIP_CONS cons, const char name, int nvars, SCIP_VAR *vars, SCIP_Real vals, int mult, SCIP_Bool initial, SCIP_Bool separate, SCIP_Bool enforce, SCIP_Bool check, SCIP_Bool propagate, SCIP_Bool local, SCIP_Bool modifiable, SCIP_Bool dynamic, SCIP_Bool removable, SCIP_Bool stickingatnode)

static	SCIP_DECL_LINCONSUPGD (linconsUpgdLogicor)

static	SCIP_DECL_CONSHDLRCOPY (conshdlrCopyLogicor)

static	SCIP_DECL_CONSFREE (consFreeLogicor)

static	SCIP_DECL_CONSINITPRE (consInitpreLogicor)

static	SCIP_DECL_CONSEXITPRE (consExitpreLogicor)

static	SCIP_DECL_CONSEXITSOL (consExitsolLogicor)

static	SCIP_DECL_CONSDELETE (consDeleteLogicor)

static	SCIP_DECL_CONSTRANS (consTransLogicor)

static	SCIP_DECL_CONSINITLP (consInitlpLogicor)

static	SCIP_DECL_CONSSEPALP (consSepalpLogicor)

static	SCIP_DECL_CONSSEPASOL (consSepasolLogicor)

static	SCIP_DECL_CONSENFOLP (consEnfolpLogicor)

static	SCIP_DECL_CONSENFOPS (consEnfopsLogicor)

static	SCIP_DECL_CONSCHECK (consCheckLogicor)

static	SCIP_DECL_CONSPROP (consPropLogicor)

static	SCIP_DECL_CONSPRESOL (consPresolLogicor)

static	SCIP_DECL_CONSRESPROP (consRespropLogicor)

static	SCIP_DECL_CONSLOCK (consLockLogicor)

static	SCIP_DECL_CONSACTIVE (consActiveLogicor)

static	SCIP_DECL_CONSDEACTIVE (consDeactiveLogicor)

static	SCIP_DECL_CONSPRINT (consPrintLogicor)

static	SCIP_DECL_CONSCOPY (consCopyLogicor)

static	SCIP_DECL_CONSPARSE (consParseLogicor)

static	SCIP_DECL_CONSGETVARS (consGetVarsLogicor)

static	SCIP_DECL_CONSGETNVARS (consGetNVarsLogicor)

static	SCIP_DECL_EVENTEXEC (eventExecLogicor)

static	SCIP_DECL_CONFLICTEXEC (conflictExecLogicor)

SCIP_RETCODE	SCIPincludeConshdlrLogicor (SCIP *scip)

SCIP_RETCODE	SCIPcreateConsLogicor (SCIP scip, SCIP_CONS cons, const char name, int nvars, SCIP_VAR **vars, SCIP_Bool initial, SCIP_Bool separate, SCIP_Bool enforce, SCIP_Bool check, SCIP_Bool propagate, SCIP_Bool local, SCIP_Bool modifiable, SCIP_Bool dynamic, SCIP_Bool removable, SCIP_Bool stickingatnode)

SCIP_RETCODE	SCIPcreateConsBasicLogicor (SCIP scip, SCIP_CONS cons, const char name, int nvars, SCIP_VAR **vars)

SCIP_RETCODE	SCIPaddCoefLogicor (SCIP scip, SCIP_CONS cons, SCIP_VAR *var)

int	SCIPgetNVarsLogicor (SCIP scip, SCIP_CONS cons)

SCIP_VAR **	SCIPgetVarsLogicor (SCIP scip, SCIP_CONS cons)

SCIP_Real	SCIPgetDualsolLogicor (SCIP scip, SCIP_CONS cons)

SCIP_Real	SCIPgetDualfarkasLogicor (SCIP scip, SCIP_CONS cons)

SCIP_ROW *	SCIPgetRowLogicor (SCIP scip, SCIP_CONS cons)

Macro Definition Documentation

#define CONSHDLR_NAME "logicor"

Definition at line 35 of file cons_logicor.c.

Referenced by addCoef(), enforcePseudo(), processWatchedVars(), SCIPaddCoefLogicor(), SCIPcreateConsLogicor(), SCIPgetDualfarkasLogicor(), SCIPgetDualsolLogicor(), SCIPgetNVarsLogicor(), SCIPgetRowLogicor(), SCIPgetVarsLogicor(), SCIPincludeConshdlrLogicor(), and separateCons().

#define CONSHDLR_DESC "logic or constraints"

Definition at line 36 of file cons_logicor.c.

Referenced by SCIPincludeConshdlrLogicor().

#define CONSHDLR_SEPAPRIORITY +10000

priority of the constraint handler for separation

Definition at line 37 of file cons_logicor.c.

Referenced by SCIPincludeConshdlrLogicor().

#define CONSHDLR_ENFOPRIORITY -2000000

priority of the constraint handler for constraint enforcing

Definition at line 38 of file cons_logicor.c.

Referenced by SCIPincludeConshdlrLogicor().

#define CONSHDLR_CHECKPRIORITY -2000000

priority of the constraint handler for checking feasibility

Definition at line 39 of file cons_logicor.c.

Referenced by SCIPincludeConshdlrLogicor().

#define CONSHDLR_SEPAFREQ 0

frequency for separating cuts; zero means to separate only in the root node

Definition at line 40 of file cons_logicor.c.

Referenced by SCIPincludeConshdlrLogicor().

#define CONSHDLR_PROPFREQ 1

frequency for propagating domains; zero means only preprocessing propagation

Definition at line 41 of file cons_logicor.c.

Referenced by SCIPincludeConshdlrLogicor().

#define CONSHDLR_EAGERFREQ 100

frequency for using all instead of only the useful constraints in separation, propagation and enforcement, -1 for no eager evaluations, 0 for first only

Definition at line 42 of file cons_logicor.c.

Referenced by SCIPincludeConshdlrLogicor().

#define CONSHDLR_MAXPREROUNDS -1

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

Definition at line 45 of file cons_logicor.c.

Referenced by SCIPincludeConshdlrLogicor().

#define CONSHDLR_DELAYSEPA FALSE

should separation method be delayed, if other separators found cuts?

Definition at line 46 of file cons_logicor.c.

Referenced by SCIPincludeConshdlrLogicor().

#define CONSHDLR_DELAYPROP FALSE

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

Definition at line 47 of file cons_logicor.c.

Referenced by SCIPincludeConshdlrLogicor().

#define CONSHDLR_NEEDSCONS TRUE

should the constraint handler be skipped, if no constraints are available?

Definition at line 48 of file cons_logicor.c.

Referenced by SCIPincludeConshdlrLogicor().

#define CONSHDLR_PRESOLTIMING SCIP_PRESOLTIMING_ALWAYS

Definition at line 50 of file cons_logicor.c.

Referenced by SCIPincludeConshdlrLogicor().

#define CONSHDLR_PROP_TIMING SCIP_PROPTIMING_BEFORELP

Definition at line 51 of file cons_logicor.c.

Referenced by SCIPincludeConshdlrLogicor().

#define LINCONSUPGD_PRIORITY +800000

priority of the constraint handler for upgrading of linear constraints

Definition at line 53 of file cons_logicor.c.

Referenced by SCIPincludeConshdlrLogicor().

#define EVENTHDLR_NAME "logicor"

Definition at line 55 of file cons_logicor.c.

Referenced by SCIPincludeConshdlrLogicor().

#define EVENTHDLR_DESC "event handler for logic or constraints"

Definition at line 56 of file cons_logicor.c.

Referenced by SCIPincludeConshdlrLogicor().

#define CONFLICTHDLR_NAME "logicor"

Definition at line 58 of file cons_logicor.c.

Referenced by SCIPincludeConshdlrLogicor().

#define CONFLICTHDLR_DESC "conflict handler creating logic or constraints"

Definition at line 59 of file cons_logicor.c.

Referenced by SCIPincludeConshdlrLogicor().

#define CONFLICTHDLR_PRIORITY LINCONSUPGD_PRIORITY

Definition at line 60 of file cons_logicor.c.

Referenced by SCIPincludeConshdlrLogicor().

#define DEFAULT_PRESOLPAIRWISE TRUE

should pairwise constraint comparison be performed in presolving?

Definition at line 62 of file cons_logicor.c.

Referenced by SCIPincludeConshdlrLogicor().

#define DEFAULT_STRENGTHEN TRUE

should pairwise constraint comparison try to strengthen constraints by removing superflous non-zeros?

Definition at line 63 of file cons_logicor.c.

Referenced by SCIPincludeConshdlrLogicor().

#define HASHSIZE_LOGICORCONS 131101

minimal size of hash table in logicor constraint tables

Definition at line 65 of file cons_logicor.c.

Referenced by detectRedundantConstraints().

#define DEFAULT_PRESOLUSEHASHING TRUE

should hash table be used for detecting redundant constraints in advance

Definition at line 66 of file cons_logicor.c.

Referenced by SCIPincludeConshdlrLogicor().

#define DEFAULT_DUALPRESOLVING TRUE

should dual presolving steps be performed?

Definition at line 67 of file cons_logicor.c.

Referenced by SCIPincludeConshdlrLogicor().

#define DEFAULT_NEGATEDCLIQUE TRUE

should negated clique information be used in presolving

Definition at line 68 of file cons_logicor.c.

Referenced by SCIPincludeConshdlrLogicor().

#define DEFAULT_IMPLICATIONS TRUE

should we try to shrink the variables and derive global boundchanges by using cliques and implications

Definition at line 69 of file cons_logicor.c.

Referenced by SCIPincludeConshdlrLogicor().

#define AGEINCREASE ( n ) (1.0 + 0.2 * (n))

Definition at line 75 of file cons_logicor.c.

Referenced by processWatchedVars().

#define HASHTABLESIZE_FACTOR 5

Definition at line 2821 of file cons_logicor.c.

Referenced by removeRedundantConssAndNonzeros(), and SCIP_DECL_CONSINITPRE().

#define MAX_CONSLENGTH 200

Definition at line 3070 of file cons_logicor.c.

Referenced by shortenConss().

#define MAXCOMPARISONS 1000000

Definition at line 3266 of file cons_logicor.c.

Referenced by removeConstraintsDueToNegCliques().

Function Documentation

static SCIP_RETCODE lockRounding	(	SCIP *	scip,
		SCIP_CONS *	cons,
		SCIP_VAR *	var
	)

static

installs rounding locks for the given variable in the given logic or constraint

Parameters

scip	SCIP data structure
cons	logic or constraint
var	variable of constraint entry

Definition at line 144 of file cons_logicor.c.

References FALSE, SCIP_CALL, SCIP_OKAY, SCIPlockVarCons(), TRUE, and unlockRounding().

Referenced by addCoef().

static SCIP_RETCODE unlockRounding	(	SCIP *	scip,
		SCIP_CONS *	cons,
		SCIP_VAR *	var
	)

static

removes rounding locks for the given variable in the given logic or constraint

Parameters

scip	SCIP data structure
cons	logic or constraint
var	variable of constraint entry

Definition at line 158 of file cons_logicor.c.

References conshdlrdataCreate(), FALSE, SCIP_CALL, SCIP_OKAY, SCIPunlockVarCons(), and TRUE.

Referenced by delCoefPos(), and lockRounding().

static SCIP_RETCODE conshdlrdataCreate	(	SCIP *	scip,
		SCIP_CONSHDLRDATA **	conshdlrdata,
		SCIP_EVENTHDLR *	eventhdlr
	)

static

creates constraint handler data for logic or constraint handler

Parameters

scip	SCIP data structure
conshdlrdata	pointer to store the constraint handler data
eventhdlr	event handler

Definition at line 172 of file cons_logicor.c.

References conshdlrdataFree(), NULL, SCIP_CALL, SCIP_OKAY, and SCIPallocMemory.

Referenced by SCIPincludeConshdlrLogicor(), and unlockRounding().

static SCIP_RETCODE conshdlrdataFree	(	SCIP *	scip,
		SCIP_CONSHDLRDATA **	conshdlrdata
	)

static

frees constraint handler data for logic or constraint handler

Parameters

scip	SCIP data structure
conshdlrdata	pointer to the constraint handler data

Definition at line 197 of file cons_logicor.c.

References consdataEnsureVarsSize(), NULL, SCIP_OKAY, and SCIPfreeMemory.

Referenced by conshdlrdataCreate().

static SCIP_RETCODE consdataEnsureVarsSize	(	SCIP *	scip,
		SCIP_CONSDATA *	consdata,
		int	num
	)

static

ensures, that the vars array can store at least num entries

Parameters

scip	SCIP data structure
consdata	logicor constraint data
num	minimum number of entries to store

Definition at line 212 of file cons_logicor.c.

References consdataCreate(), NULL, SCIP_CALL, SCIP_OKAY, SCIPcalcMemGrowSize(), and SCIPreallocBlockMemoryArray.

Referenced by addCoef(), and conshdlrdataFree().

static SCIP_RETCODE consdataCreate	(	SCIP *	scip,
		SCIP_CONSDATA **	consdata,
		int	nvars,
		SCIP_VAR **	vars
	)

static

creates a logic or constraint data object

Parameters

scip	SCIP data structure
consdata	pointer to store the logic or constraint data
nvars	number of variables in the constraint
vars	variables of the constraint

Definition at line 236 of file cons_logicor.c.

References consdataFree(), FALSE, NULL, SCIP_CALL, SCIP_OKAY, SCIP_VARSTATUS_MULTAGGR, SCIPallocBlockMemory, SCIPcaptureVar(), SCIPduplicateBlockMemoryArray, SCIPgetTransformedVars(), SCIPisTransformed(), SCIPvarGetProbvar(), SCIPvarGetStatus(), and TRUE.

Referenced by consdataEnsureVarsSize(), and SCIPcreateConsLogicor().

static SCIP_RETCODE consdataFree	(	SCIP *	scip,
		SCIP_CONSDATA **	consdata
	)

static

frees a logic or constraint data

Parameters

scip	SCIP data structure
consdata	pointer to the logic or constraint

Definition at line 304 of file cons_logicor.c.

References consdataPrint(), NULL, SCIP_CALL, SCIP_OKAY, SCIPfreeBlockMemory, SCIPfreeBlockMemoryArrayNull, SCIPreleaseRow(), and SCIPreleaseVar().

Referenced by consdataCreate().

static SCIP_RETCODE consdataPrint	(	SCIP *	scip,
		SCIP_CONSDATA *	consdata,
		FILE *	file,
		SCIP_Bool	endline
	)

static

prints logic or constraint to file stream

Parameters

scip	SCIP data structure
consdata	logic or constraint data
file	output file (or NULL for standard output)
endline	should an endline be set?

Definition at line 335 of file cons_logicor.c.

References NULL, SCIP_CALL, SCIP_OKAY, SCIPinfoMessage(), SCIPwriteVarsList(), switchWatchedvars(), and TRUE.

Referenced by applyFixings(), and consdataFree().

static SCIP_RETCODE switchWatchedvars	(	SCIP *	scip,
		SCIP_CONS *	cons,
		SCIP_EVENTHDLR *	eventhdlr,
		int	watchedvar1,
		int	watchedvar2
	)

static

stores the given variable numbers as watched variables, and updates the event processing

Parameters

scip	SCIP data structure
cons	logic or constraint
eventhdlr	event handler to call for the event processing
watchedvar1	new first watched variable
watchedvar2	new second watched variable

Definition at line 361 of file cons_logicor.c.

References addCoef(), NULL, SCIP_CALL, SCIP_EVENTTYPE_LBRELAXED, SCIP_EVENTTYPE_UBTIGHTENED, SCIP_OKAY, SCIPcatchVarEvent(), SCIPconsGetData(), and SCIPdropVarEvent().

Referenced by consdataPrint(), delCoefPos(), and processWatchedVars().

static SCIP_RETCODE addCoef	(	SCIP *	scip,
		SCIP_CONS *	cons,
		SCIP_VAR *	var
	)

static

adds coefficient in logicor constraint

Parameters

scip	SCIP data structure
cons	logicor constraint
var	variable to add to the constraint

Definition at line 432 of file cons_logicor.c.

References consdataEnsureVarsSize(), CONSHDLR_NAME, delCoefPos(), FALSE, lockRounding(), NULL, SCIP_Bool, SCIP_CALL, SCIP_EVENTTYPE_VARFIXED, SCIP_OKAY, SCIP_STAGE_INITPRESOLVE, SCIP_STAGE_PRESOLVING, SCIP_VARSTATUS_MULTAGGR, SCIPaddVarToRow(), SCIPcaptureVar(), SCIPcatchVarEvent(), SCIPconsGetData(), SCIPconshdlrGetData(), SCIPconsIsTransformed(), SCIPfindConshdlr(), SCIPgetStage(), SCIPgetTransformedVar(), SCIPvarGetProbvar(), SCIPvarGetStatus(), SCIPvarIsTransformed(), and TRUE.

Referenced by applyFixings(), SCIPaddCoefLogicor(), and switchWatchedvars().

static SCIP_RETCODE delCoefPos	(	SCIP *	scip,
		SCIP_CONS *	cons,
		SCIP_EVENTHDLR *	eventhdlr,
		int	pos
	)

static

deletes coefficient at given position from logic or constraint data

Parameters

scip	SCIP data structure
cons	logic or constraint
eventhdlr	event handler to call for the event processing
pos	position of coefficient to delete

Definition at line 502 of file cons_logicor.c.

References dualPresolving(), FALSE, NULL, SCIP_CALL, SCIP_EVENTTYPE_VARFIXED, SCIP_OKAY, SCIP_STAGE_INITPRESOLVE, SCIP_STAGE_PRESOLVING, SCIPconsGetData(), SCIPconsIsTransformed(), SCIPdropVarEvent(), SCIPenableConsPropagation(), SCIPgetStage(), SCIPreleaseVar(), SCIPvarIsTransformed(), switchWatchedvars(), TRUE, and unlockRounding().

Referenced by addCoef(), applyFixings(), dualPresolving(), mergeMultiples(), removeConstraintsDueToNegCliques(), removeRedundantNonZeros(), and shortenConss().

static SCIP_RETCODE dualPresolving	(	SCIP *	scip,
		SCIP_CONS *	cons,
		SCIP_EVENTHDLR *	eventhdlr,
		int *	nfixedvars,
		int *	ndelconss,
		int *	nchgcoefs,
		SCIP_RESULT *	result
	)

static

in case a part (more than one variable) in the logic or constraint is independent of every else, we can perform dual reductions;

fix the variable with the smallest object coefficient to one if the constraint is not modifiable and all variable are independant
fix all independant variables with negative object coefficient to one
fix all remaining independant variables to zero

also added the special case were exactly one variable is locked by this constraint and another variable without any uplocks has a better objective value than this single variable

here we fix the variable to 0.0 (if the objective contribution is non-negative)

Note: the following dual reduction for logic or constraints is already performed by the presolver "dualfix"

if a variable in a set covering constraint is only locked by that constraint and has negative or zero objective coefficient than it can be fixed to one

Parameters

scip	SCIP data structure
cons	setppc constraint
eventhdlr	event handler to call for the event processing
nfixedvars	pointer to count number of fixings
ndelconss	pointer to count number of deleted constraints
nchgcoefs	pointer to count number of changed/deleted coefficients
result	pointer to store the result SCIP_SUCCESS, if presolving was performed

Definition at line 584 of file cons_logicor.c.

References applyFixings(), delCoefPos(), FALSE, NULL, SCIP_Bool, SCIP_CALL, SCIP_INVALID, SCIP_OKAY, SCIP_Real, SCIP_SUCCESS, SCIPconsGetData(), SCIPconsIsActive(), SCIPconsIsChecked(), SCIPconsIsModifiable(), SCIPdebugMessage, SCIPdelCons(), SCIPfixVar(), SCIPinfinity(), SCIPisGE(), SCIPisLT(), SCIPisNegative(), SCIPvarGetAggregatedObj(), SCIPvarGetLbGlobal(), SCIPvarGetName(), SCIPvarGetNLocksDown(), SCIPvarGetNLocksUp(), SCIPvarGetObj(), SCIPvarGetProbvarBinary(), SCIPvarGetUbGlobal(), and SCIPvarIsActive().

Referenced by delCoefPos().

static SCIP_RETCODE applyFixings	(	SCIP *	scip,
		SCIP_CONS *	cons,
		SCIP_EVENTHDLR *	eventhdlr,
		SCIP_Bool *	redundant,
		int *	nchgcoefs,
		int *	naddconss,
		int *	ndelconss
	)

static

deletes all zero-fixed variables, checks for variables fixed to one, replace all variables which are not active or not a negation of an active variable by there active or negation of an active counterpart

Parameters

scip	SCIP data structure
cons	logic or constraint
eventhdlr	event handler to call for the event processing
redundant	returns whether a variable fixed to one exists in the constraint
nchgcoefs	pointer to count number of changed/deleted coefficients
naddconss	pointer to count number of added constraints, or NULL indicating we can not resolve multi-aggregations
ndelconss	pointer to count number of deleted constraints, or NULL indicating we can not resolve multi-aggregations

Definition at line 835 of file cons_logicor.c.

References addCoef(), analyzeConflict(), consdataPrint(), delCoefPos(), FALSE, MAX, NULL, SCIP_Bool, SCIP_CALL, SCIP_ERROR, SCIP_MAXSTRLEN, SCIP_OKAY, SCIP_Real, SCIP_VARSTATUS_MULTAGGR, SCIP_VARSTATUS_NEGATED, SCIPaddCons(), SCIPallocBufferArray, SCIPconsGetData(), SCIPconsGetName(), SCIPconsIsAdded(), SCIPconsIsChecked(), SCIPconsIsDynamic(), SCIPconsIsEnforced(), SCIPconsIsInitial(), SCIPconsIsLocal(), SCIPconsIsModifiable(), SCIPconsIsPropagated(), SCIPconsIsRemovable(), SCIPconsIsSeparated(), SCIPconsIsStickingAtNode(), SCIPcreateConsLinear(), SCIPdebug, SCIPdebugMessage, SCIPdebugPrintCons, SCIPdelCons(), SCIPerrorMessage, SCIPfreeBufferArray, SCIPgetBinvarRepresentatives(), SCIPgetProbvarLinearSum(), SCIPinfinity(), SCIPisEQ(), SCIPisFeasEQ(), SCIPisZero(), SCIPreallocBufferArray, SCIPreleaseCons(), SCIPsnprintf(), SCIPvarGetLbGlobal(), SCIPvarGetNegatedVar(), SCIPvarGetNegationVar(), SCIPvarGetStatus(), SCIPvarGetUbGlobal(), SCIPvarIsActive(), SCIPvarIsBinary(), SCIPwarningMessage(), and TRUE.

Referenced by dualPresolving(), fixDeleteOrUpgradeCons(), and prepareCons().

static SCIP_RETCODE analyzeConflict	(	SCIP *	scip,
		SCIP_CONS *	cons
	)

static

analyzes conflicting assignment on given constraint, and adds conflict constraint to problem

Parameters

scip	SCIP data structure
cons	logic or constraint that detected the conflict

Definition at line 1088 of file cons_logicor.c.

References disableCons(), NULL, SCIP_CALL, SCIP_OKAY, SCIP_STAGE_SOLVING, SCIPaddConflictBinvar(), SCIPanalyzeConflictCons(), SCIPconsGetData(), SCIPgetStage(), SCIPinitConflictAnalysis(), SCIPinProbing(), and SCIPisConflictAnalysisApplicable().

Referenced by applyFixings(), and processWatchedVars().

static SCIP_RETCODE disableCons	(	SCIP *	scip,
		SCIP_CONS *	cons
	)

static

disables or deletes the given constraint, depending on the current depth

Parameters

scip	SCIP data structure
cons	bound disjunction constraint to be disabled

Definition at line 1118 of file cons_logicor.c.

References mergeMultiples(), SCIP_CALL, SCIP_OKAY, SCIPconsGetName(), SCIPconsGetValidDepth(), SCIPdebugMessage, SCIPdelCons(), SCIPdisableCons(), and SCIPgetDepth().

Referenced by analyzeConflict(), and processWatchedVars().

static SCIP_RETCODE mergeMultiples	(	SCIP *	scip,
		SCIP_CONS *	cons,
		SCIP_EVENTHDLR *	eventhdlr,
		unsigned char **	entries,
		int *	nentries,
		SCIP_Bool *	redundant,
		int *	nchgcoefs
	)

static

find pairs of negated variables in constraint: constraint is redundant find sets of equal variables in constraint: multiple entries of variable can be replaced by single entry

Parameters

scip	SCIP data structure
cons	logic or constraint
eventhdlr	event handler to call for the event processing
entries	array to store whether two positions in constraints represent the same variable
nentries	pointer for array size, if array will be to small it's corrected
redundant	returns whether a variable fixed to one exists in the constraint
nchgcoefs	pointer to count number of changed/deleted coefficients

Definition at line 1142 of file cons_logicor.c.

References delCoefPos(), FALSE, NULL, processWatchedVars(), SCIP_Bool, SCIP_CALL, SCIP_OKAY, SCIP_VARSTATUS_NEGATED, SCIP_VARTYPE_BINARY, SCIP_VARTYPE_IMPLINT, SCIP_VARTYPE_INTEGER, SCIPallocBufferArray, SCIPconsGetData(), SCIPconsGetName(), SCIPdebugMessage, SCIPfreeBufferArray, SCIPgetNBinVars(), SCIPgetNImplVars(), SCIPgetNIntVars(), SCIPvarGetName(), SCIPvarGetNegationVar(), SCIPvarGetProbindex(), SCIPvarGetStatus(), SCIPvarGetType(), SCIPvarIsActive(), SCIPvarIsBinary(), SCIPvarIsNegated(), and TRUE.

Referenced by disableCons(), and prepareCons().

static SCIP_RETCODE processWatchedVars	(	SCIP *	scip,
		SCIP_CONS *	cons,
		SCIP_EVENTHDLR *	eventhdlr,
		SCIP_Bool *	cutoff,
		SCIP_Bool *	reduceddom,
		SCIP_Bool *	addcut,
		SCIP_Bool *	mustcheck
	)

static

checks constraint for violation only looking at the watched variables, applies fixings if possible

Parameters

scip	SCIP data structure
cons	logic or constraint to be processed
eventhdlr	event handler to call for the event processing
cutoff	pointer to store TRUE, if the node can be cut off
reduceddom	pointer to store TRUE, if a domain reduction was found
addcut	pointer to store whether this constraint must be added as a cut
mustcheck	pointer to store whether this constraint must be checked for feasibility

Definition at line 1291 of file cons_logicor.c.

References AGEINCREASE, analyzeConflict(), checkCons(), CONSHDLR_NAME, disableCons(), FALSE, NULL, SCIP_Bool, SCIP_BRANCHDIR_DOWNWARDS, SCIP_CALL, SCIP_Longint, SCIP_LONGINT_MAX, SCIP_OKAY, SCIPaddConsAge(), SCIPconsGetData(), SCIPconsGetHdlr(), SCIPconsGetName(), SCIPconshdlrGetName(), SCIPconsIsModifiable(), SCIPdebugMessage, SCIPdisableConsPropagation(), SCIPgetDepth(), SCIPinferBinvarCons(), SCIPisFeasEQ(), SCIPresetConsAge(), SCIPvarGetLbLocal(), SCIPvarGetName(), SCIPvarGetNBranchingsCurrentRun(), SCIPvarGetUbLocal(), switchWatchedvars(), and TRUE.

Referenced by enforcePseudo(), mergeMultiples(), and separateCons().

static SCIP_RETCODE checkCons	(	SCIP *	scip,
		SCIP_CONS *	cons,
		SCIP_SOL *	sol,
		SCIP_Bool *	violated
	)

static

checks constraint for violation, returns TRUE iff constraint is feasible

Parameters

scip	SCIP data structure
cons	logic or constraint to be checked
sol	primal CIP solution
violated	pointer to store whether the given solution violates the constraint

Definition at line 1509 of file cons_logicor.c.

References createRow(), FALSE, NULL, SCIP_OKAY, SCIP_Real, SCIPconsGetData(), SCIPgetSolVal(), SCIPisFeasGE(), SCIPisFeasLE(), SCIPisFeasLT(), and SCIPvarIsBinary().

Referenced by enforcePseudo(), processWatchedVars(), and separateCons().

static SCIP_RETCODE createRow	(	SCIP *	scip,
		SCIP_CONS *	cons
	)

static

creates an LP row in a logic or constraint data object

Parameters

scip	SCIP data structure
cons	logic or constraint

Definition at line 1552 of file cons_logicor.c.

References addCut(), NULL, SCIP_CALL, SCIP_OKAY, SCIPaddVarsToRowSameCoef(), SCIPconsGetData(), SCIPconsGetHdlr(), SCIPconsGetName(), SCIPconsIsLocal(), SCIPconsIsModifiable(), SCIPconsIsRemovable(), SCIPcreateEmptyRowCons(), and SCIPinfinity().

Referenced by addCut(), and checkCons().

static SCIP_RETCODE addCut	(	SCIP *	scip,
		SCIP_CONS *	cons,
		SCIP_SOL *	sol,
		SCIP_Bool *	cutoff
	)

static

adds logic or constraint as cut to the LP

Parameters

scip	SCIP data structure
cons	logic or constraint
sol	primal CIP solution, NULL for current LP solution
cutoff	whether a cutoff has been detected

Definition at line 1573 of file cons_logicor.c.

References createRow(), FALSE, NULL, SCIP_CALL, SCIP_OKAY, SCIPaddCut(), SCIPconsGetData(), SCIPconsGetName(), SCIPdebugMessage, SCIProwIsInLP(), and separateCons().

Referenced by createRow(), SCIP_DECL_CONSINITLP(), and separateCons().

static SCIP_RETCODE separateCons	(	SCIP *	scip,
		SCIP_CONS *	cons,
		SCIP_SOL *	sol,
		SCIP_EVENTHDLR *	eventhdlr,
		SCIP_Bool *	cutoff,
		SCIP_Bool *	separated,
		SCIP_Bool *	reduceddom
	)

static

checks constraint for violation, and adds it as a cut if possible

Parameters

scip	SCIP data structure
cons	logic or constraint to be separated
sol	primal CIP solution, NULL for current LP solution
eventhdlr	event handler to call for the event processing
cutoff	pointer to store TRUE, if the node can be cut off
separated	pointer to store TRUE, if a cut was found
reduceddom	pointer to store TRUE, if a domain reduction was found

Definition at line 1607 of file cons_logicor.c.

References addCut(), checkCons(), CONSHDLR_NAME, enforcePseudo(), FALSE, NULL, processWatchedVars(), SCIP_Bool, SCIP_CALL, SCIP_OKAY, SCIP_Real, SCIPconsGetData(), SCIPconsGetHdlr(), SCIPconsGetName(), SCIPconshdlrGetName(), SCIPconsIsPropagationEnabled(), SCIPdebugMessage, SCIPgetRowLPFeasibility(), SCIPisFeasNegative(), SCIPresetConsAge(), SCIProwIsInLP(), and TRUE.

Referenced by addCut().

static SCIP_RETCODE enforcePseudo	(	SCIP *	scip,
		SCIP_CONS *	cons,
		SCIP_EVENTHDLR *	eventhdlr,
		SCIP_Bool *	cutoff,
		SCIP_Bool *	infeasible,
		SCIP_Bool *	reduceddom,
		SCIP_Bool *	solvelp
	)

static

enforces the pseudo solution on the given constraint

Parameters

scip	SCIP data structure
cons	logic or constraint to be separated
eventhdlr	event handler to call for the event processing
cutoff	pointer to store TRUE, if the node can be cut off
infeasible	pointer to store TRUE, if the constraint was infeasible
reduceddom	pointer to store TRUE, if a domain reduction was found
solvelp	pointer to store TRUE, if the LP has to be solved

Definition at line 1684 of file cons_logicor.c.

References checkCons(), consdataSort(), CONSHDLR_NAME, FALSE, NULL, processWatchedVars(), SCIP_Bool, SCIP_CALL, SCIP_OKAY, SCIPconsGetHdlr(), SCIPconshdlrGetName(), SCIPconsIsPropagationEnabled(), SCIPhasCurrentNodeLP(), SCIPresetConsAge(), and TRUE.

Referenced by separateCons().

static void consdataSort ( SCIP_CONSDATA * consdata )

static

sorts logicor constraint's variables by non-decreasing variable index

Parameters

consdata linear constraint data

Definition at line 1743 of file cons_logicor.c.

References NULL, SCIP_Bool, SCIP_DECL_HASHGETKEY(), SCIPsortedvecFindPtr(), SCIPsortPtr(), SCIPvarCompare(), and TRUE.

Referenced by detectRedundantConstraints(), enforcePseudo(), removeRedundantConssAndNonzeros(), and removeRedundantNonZeros().

static SCIP_DECL_HASHGETKEY ( hashGetKeyLogicorcons )

static

gets the key of the given element

Definition at line 1824 of file cons_logicor.c.

Referenced by consdataSort().

static SCIP_DECL_HASHKEYEQ ( hashKeyEqLogicorcons )

static

returns TRUE iff both keys are equal; two constraints are equal if they have the same variables

Definition at line 1832 of file cons_logicor.c.

static SCIP_DECL_HASHKEYVAL ( hashKeyValLogicorcons )

static

returns the hash value of the key

Definition at line 1878 of file cons_logicor.c.

static SCIP_RETCODE detectRedundantConstraints	(	SCIP *	scip,
		BMS_BLKMEM *	blkmem,
		SCIP_CONS **	conss,
		int	nconss,
		int *	firstchange,
		int *	ndelconss
	)

static

compares each constraint with all other constraints for a possible duplication and removes duplicates using a hash table; also

See also: removeRedundantConssAndNonzeros()

Parameters

scip	SCIP data structure
blkmem	block memory
conss	constraint set
nconss	number of constraints in constraint set
firstchange	pointer to store first changed constraint
ndelconss	pointer to count number of deleted constraints

Definition at line 1905 of file cons_logicor.c.

References consdataSort(), HASHSIZE_LOGICORCONS, MAX, NULL, removeRedundantCons(), SCIP_CALL, SCIP_OKAY, SCIPcalcHashtableSize(), SCIPconsGetData(), SCIPconsGetPos(), SCIPconsIsActive(), SCIPconsIsModifiable(), SCIPdelCons(), SCIPhashtableCreate(), SCIPhashtableFree(), SCIPhashtableInsert(), SCIPhashtableRetrieve(), and SCIPupdateConsFlags().

static SCIP_RETCODE removeRedundantCons	(	SCIP *	scip,
		SCIP_CONS *	cons0,
		SCIP_CONS *	cons1,
		int *	ndelconss
	)

static

removes the redundant second constraint and updates the flags of the first one

Parameters

scip	SCIP data structure
cons0	constraint that should stay
cons1	constraint that should be deleted
ndelconss	pointer to count number of deleted constraints

Definition at line 1993 of file cons_logicor.c.

References calcSignature(), NULL, SCIP_CALL, SCIP_OKAY, SCIPconsGetName(), SCIPdebugMessage, SCIPdebugPrintCons, SCIPdelCons(), and SCIPupdateConsFlags().

Referenced by detectRedundantConstraints(), and removeRedundantConss().

static unsigned int calcSignature	(	SCIP_VAR **	vars,
		int	nvars
	)

static

compute and return a signature for given variables

Parameters

vars	variables to calculate the signature for
nvars	number of variables to calculate the signature for

Definition at line 2020 of file cons_logicor.c.

References consdataCalcSignature(), NULL, and SCIPvarGetIndex().

Referenced by consdataCalcSignature(), removeRedundantCons(), and removeRedundantNonZeros().

static void consdataCalcSignature ( SCIP_CONSDATA * consdata )

static

compute the constraint signature which is used to detect constraints, that contain potentially the same set of variables

Parameters

consdata logicor constraint data

Definition at line 2043 of file cons_logicor.c.

References calcSignature(), removeConsFromOccurList(), and TRUE.

Referenced by calcSignature(), removeRedundantConssAndNonzeros(), and removeRedundantNonZeros().

static void removeConsFromOccurList	(	SCIP_CONS *	cons,
		SCIP_HASHMAP *	varstopos,
		SCIP_CONS ***	occurlist,
		int *	noccurlistentries,
		int	occurlistlength
	)

static

remove a constraint from the column representation

Parameters

cons	logicor constraint
varstopos	map for mapping variables to positions in the occurlist
occurlist	column representation of logicor constraints
noccurlistentries	arrray with number of constraints for each variable in the occurlist
occurlistlength	number of columns in the occurlist

Definition at line 2056 of file cons_logicor.c.

References findShortestOccurlist(), NULL, SCIPconsGetData(), SCIPconsIsActive(), SCIPhashmapExists(), and SCIPhashmapGetImage().

Referenced by consdataCalcSignature(), removeRedundantConss(), and removeRedundantNonZeros().

static void findShortestOccurlist	(	SCIP_VAR **	vars,
		int	nvars,
		SCIP_HASHMAP *	varstopos,
		SCIP_CONS ***	occurlist,
		int *	noccurlistentries,
		int	occurlistlength,
		int *	nentries,
		SCIP_CONS ***	shortestlist
	)

static

determine shortest constraint list in column representation

Parameters

vars	variables to find the shortestlist for
nvars	number of variables
varstopos	map for mapping variables to positions in the occurlist
occurlist	column representation of logicor constraints
noccurlistentries	arrray with number of constraints for each variable in the occurlist
occurlistlength	number of columns in the occurlist
nentries	pointer to store the number of entries in the shortest list
shortestlist	pointer to store smallest array with constraints

Definition at line 2116 of file cons_logicor.c.

References NULL, removeRedundantConss(), SCIPhashmapExists(), and SCIPhashmapGetImage().

Referenced by removeConsFromOccurList(), removeRedundantConss(), and removeRedundantNonZeros().

static SCIP_RETCODE removeRedundantConss	(	SCIP *	scip,
		SCIP_CONS *	cons,
		SCIP_HASHMAP *	varstopos,
		SCIP_CONS ***	occurlist,
		int *	noccurlistentries,
		int	occurlistlength,
		int *	ndelconss
	)

static

run a pairwise comparison for detecting subset-constraints of other constraint while using a signature

Parameters

scip	SCIP data structure
cons	logicor constraint to check if it covers another
varstopos	map for mapping variables to positions in the occurlist
occurlist	column representation of logicor constraints
noccurlistentries	arrray with number of constraints for each variable in the occurlist
occurlistlength	number of columns in the occurlist
ndelconss	pointer to store the number of deleted constraints

Definition at line 2171 of file cons_logicor.c.

References findShortestOccurlist(), NULL, removeConsFromOccurList(), removeRedundantCons(), SCIP_CALL, SCIP_DECL_SORTPTRCOMP(), SCIP_OKAY, SCIPconsGetData(), SCIPconsIsActive(), SCIPconsIsModifiable(), and SCIPvarCompare().

Referenced by findShortestOccurlist(), and removeRedundantConssAndNonzeros().

static SCIP_DECL_SORTPTRCOMP ( conssLogicorComp )

static

compararer for sorting constraints after their number of variables

Definition at line 2289 of file cons_logicor.c.

Referenced by removeRedundantConss().

static SCIP_RETCODE addConsToOccurList	(	SCIP *	scip,
		SCIP_CONS *	cons,
		SCIP_HASHMAP *	varstopos,
		SCIP_CONS ***	occurlist,
		int *	noccurlistentries,
		int *	occurlistsizes,
		int *	occurlistlength,
		int	occurlistsize
	)

static

add a constraint to the column representation

Parameters

scip	SCIP data structure
cons	logicor constraint
varstopos	map for mapping variables to positions in the occurlist
occurlist	column representation of logicor constraints
noccurlistentries	arrray with number of constraints for each variable in the occurlist
occurlistsizes	array of sizes for each variable in the occurlist
occurlistlength	number of columns in the occurlist
occurlistsize	size of occurlist

Definition at line 2308 of file cons_logicor.c.

References NULL, removeRedundantNonZeros(), SCIP_CALL, SCIP_OKAY, SCIPallocBufferArray, SCIPcalcMemGrowSize(), SCIPconsGetData(), SCIPconsIsActive(), SCIPconsIsChecked(), SCIPhashmapExists(), SCIPhashmapGetImage(), SCIPhashmapInsert(), SCIPreallocBufferArray, SCIPvarGetNegatedVar(), SCIPvarGetNLocksDown(), and SCIPvarIsActive().

Referenced by removeRedundantConssAndNonzeros().

static SCIP_RETCODE removeRedundantNonZeros	(	SCIP *	scip,
		SCIP_CONS *	cons,
		SCIP_VAR *	artvar,
		int	artpos,
		SCIP_HASHMAP *	varstopos,
		SCIP_CONS ***	occurlist,
		int *	noccurlistentries,
		int	occurlistlength,
		SCIP_EVENTHDLR *	eventhdlr,
		int *	nchgcoefs,
		SCIP_Bool *	deleted
	)

static

run a pairwise comparison for the given variables against all constraits to detect redundant non-zeros in these constraints

Parameters

scip	SCIP data structure
cons	logicor constraint to check if it covers another
artvar	artificial negated variable of constraint
artpos	position to replace constraint variable with artvar
varstopos	map for mapping variables to positions in the occurlist
occurlist	column representation of logicor constraints
noccurlistentries	number of constraints for each variable in the occurlist
occurlistlength	number of columns in the occurlist
eventhdlr	event handler
nchgcoefs	pointer to store the number of deleted non-zeros
deleted	pointer to store if cons will be deleted

Definition at line 2407 of file cons_logicor.c.

References calcSignature(), consdataCalcSignature(), consdataSort(), delCoefPos(), FALSE, findShortestOccurlist(), NULL, removeConsFromOccurList(), SCIP_CALL, SCIP_OKAY, SCIPconsGetData(), SCIPconsGetName(), SCIPconsIsActive(), SCIPconsIsModifiable(), SCIPdebugMessage, SCIPdebugPrintCons, SCIPdelCons(), SCIPhashmapExists(), SCIPhashmapGetImage(), SCIPupdateConsFlags(), SCIPvarCompare(), SCIPvarGetName(), SCIPvarGetNegatedVar(), strengthenConss(), and TRUE.

Referenced by addConsToOccurList(), and strengthenConss().

static SCIP_RETCODE strengthenConss	(	SCIP *	scip,
		SCIP_CONS **	conss,
		int	nconss,
		SCIP_HASHMAP *	varstopos,
		SCIP_CONS ***	occurlist,
		int *	noccurlistentries,
		int	occurlistlength,
		SCIP_EVENTHDLR *	eventhdlr,
		int *	ndelconss,
		int *	nchgcoefs
	)

static

find and remove redundant non-zero entries

Parameters

scip	SCIP data structure
conss	sorted array of logicor constraint
nconss	number of sorted constraints
varstopos	map for mapping variables to positions in the occurlist
occurlist	column representation of logicor constraints
noccurlistentries	number of constraints for each variable in the occurlist
occurlistlength	number of columns in the occurlist
eventhdlr	event handler to call for the event processing
ndelconss	pointer to store the number of deleted constraints
nchgcoefs	pointer to store the number of remove coefficients

Definition at line 2650 of file cons_logicor.c.

References NULL, prepareCons(), removeRedundantNonZeros(), SCIP_Bool, SCIP_CALL, SCIP_OKAY, SCIPconsGetData(), SCIPconsIsActive(), SCIPconsIsDeleted(), SCIPconsIsModifiable(), SCIPhashmapExists(), and SCIPvarGetNegatedVar().

Referenced by removeRedundantConssAndNonzeros(), and removeRedundantNonZeros().

static SCIP_RETCODE prepareCons	(	SCIP *	scip,
		SCIP_CONS *	cons,
		SCIP_EVENTHDLR *	eventhdlr,
		unsigned char **	entries,
		int *	nentries,
		SCIP_Bool *	redundant,
		int *	nfixedvars,
		int *	nchgcoefs,
		int *	ndelconss,
		SCIP_Bool *	cutoff
	)

static

prepares a constraint by removing fixings and merge it

Parameters

scip	SCIP data structure
cons	logic or constraint
eventhdlr	event handler to call for the event processing
entries	array to store whether two positions in constraints represent the same variable
nentries	pointer for array size, if array will be to small it's corrected
redundant	returns whether a variable fixed to one exists in the constraint
nfixedvars	pointer to count number of fixings
nchgcoefs	pointer to count number of changed/deleted coefficients
ndelconss	pointer to count number of deleted constraints
cutoff	pointer to store, if cut off appeared

Definition at line 2741 of file cons_logicor.c.

References applyFixings(), FALSE, mergeMultiples(), NULL, SCIP_Bool, SCIP_CALL, SCIP_OKAY, SCIPconsGetData(), SCIPconsIsDeleted(), SCIPdebugMessage, SCIPdelCons(), SCIPfixVar(), and TRUE.

Referenced by removeConstraintsDueToNegCliques(), removeRedundantConssAndNonzeros(), shortenConss(), and strengthenConss().

static SCIP_RETCODE removeRedundantConssAndNonzeros	(	SCIP *	scip,
		SCIP_CONS **	conss,
		int	nconss,
		unsigned char **	entries,
		int *	nentries,
		SCIP_EVENTHDLR *	eventhdlr,
		SCIP_Bool	usestrengthening,
		int *	firstchange,
		int *	nfixedvars,
		int *	ndelconss,
		int *	nchgcoefs,
		SCIP_Bool *	cutoff
	)

static

find covered/subsumed constraints and redundant non-zero entries

covered: e.g.: c1: x1 + x2 + x3 >= 1 c2: x1 + x2 + x3 + x4 >= 1

strengthen: e.g.: c1: x1 + x2 + x3 >= 1 c2: x1 + x2 + ~x3 + x4 >= 1

=> c2: x1 + x2 + x4 >= 1

See also: "Effective Preprocessing in SAT through Variable and Clause Elimination" by Niklas En and Armin Biere

Parameters

scip	SCIP data structure
conss	array of logicor constraints
nconss	number of logicor constraints
entries	array to store whether two positions in constraints represent the same variable
nentries	pointer for array size, if array will be to small it's corrected
eventhdlr	event handler to call for the event processing
usestrengthening	should we try to strengthen constraints by removing superflous non-zeros?
firstchange	pointer to store first changed constraint
nfixedvars	pointer to count number of fixings
ndelconss	pointer to store the number of deleted constraints
nchgcoefs	pointer to store the number of deleted coefficients
cutoff	pointer to store, if cut off appeared

Definition at line 2838 of file cons_logicor.c.

References addConsToOccurList(), BMSclearMemoryArray, consdataCalcSignature(), consdataSort(), FALSE, HASHTABLESIZE_FACTOR, NULL, prepareCons(), removeRedundantConss(), SCIP_Bool, SCIP_CALL, SCIP_OKAY, SCIPallocBufferArray, SCIPblkmem(), SCIPcalcHashtableSize(), SCIPconsGetData(), SCIPconsIsActive(), SCIPconsIsDeleted(), SCIPconsIsModifiable(), SCIPdebugMessage, SCIPduplicateBufferArray, SCIPfreeBufferArray, SCIPfreeBufferArrayNull, SCIPgetNContVars(), SCIPgetNVars(), SCIPhashmapCreate(), SCIPhashmapFree(), SCIPsortPtr(), strengthenConss(), and TRUE.

static SCIP_RETCODE shortenConss	(	SCIP *	scip,
		SCIP_CONSHDLRDATA *	conshdlrdata,
		SCIP_EVENTHDLR *	eventhdlr,
		SCIP_CONS **	conss,
		int	nconss,
		unsigned char **	entries,
		int *	nentries,
		int *	nfixedvars,
		int *	ndelconss,
		int *	nchgcoefs,
		SCIP_Bool *	cutoff
	)

static

try to tighten constraints by reducing the number of variables in the constraints using implications and cliques, also derive fixations through them,

See also: SCIPshrinkDisjunctiveVarSet()

Parameters

scip	SCIP data structure
conshdlrdata	logic or constraint handler data
eventhdlr	event handler to call for the event processing
conss	all constraints
nconss	number of constraints
entries	array to store whether two positions in constraints represent the same variable
nentries	pointer for array size, if array will be to small it's corrected
nfixedvars	pointer to count number of fixings
ndelconss	pointer to count number of deleted constraints
nchgcoefs	pointer to count number of changed/deleted coefficients
cutoff	pointer to store, if cut off appeared

Definition at line 3076 of file cons_logicor.c.

References BMSclearMemoryArray, delCoefPos(), FALSE, MAX_CONSLENGTH, NULL, prepareCons(), SCIP_Bool, SCIP_CALL, SCIP_OKAY, SCIP_Real, SCIP_VARSTATUS_NEGATED, SCIPallocBufferArray, SCIPallocCleanBufferArray, SCIPcleanupCliques(), SCIPconsGetData(), SCIPconsIsDeleted(), SCIPdebugMessage, SCIPdelCons(), SCIPfixVar(), SCIPfreeBufferArray, SCIPfreeCleanBufferArray, SCIPgetNCliques(), SCIPgetNContVars(), SCIPgetNImplications(), SCIPgetNVars(), SCIPshrinkDisjunctiveVarSet(), SCIPvarGetNegationVar(), SCIPvarGetStatus(), SCIPvarIsActive(), and TRUE.

static SCIP_RETCODE removeConstraintsDueToNegCliques	(	SCIP *	scip,
		SCIP_CONSHDLR *	conshdlr,
		SCIP_CONSHDLR *	conshdlrsetppc,
		SCIP_EVENTHDLR *	eventhdlr,
		SCIP_CONS **	conss,
		int	nconss,
		unsigned char **	entries,
		int *	nentries,
		int *	nfixedvars,
		int *	ndelconss,
		int *	nupgdconss,
		int *	nchgcoefs,
		SCIP_Bool *	cutoff
	)

static

try to find a negated clique in a constraint which makes this constraint redundant but we need to keep the negated clique information alive, so we create a corresponding set-packing constraint

Parameters

scip	SCIP data structure
conshdlr	logicor constraint handler
conshdlrsetppc	setppc constraint handler, or NULL
eventhdlr	event handler to call for the event processing
conss	all constraints
nconss	number of constraints
entries	array to store whether two positions in constraints represent the same variable
nentries	pointer for array size, if array will be to small it's corrected
nfixedvars	pointer to count number of fixings
ndelconss	pointer to count number of deleted constraints
nupgdconss	pointer to count number of upgraded constraints
nchgcoefs	pointer to count number of changed/deleted coefficients
cutoff	pointer to store, if cut off appeared

Definition at line 3272 of file cons_logicor.c.

References BMScopyMemoryArray, delCoefPos(), FALSE, fixDeleteOrUpgradeCons(), MAXCOMPARISONS, NULL, prepareCons(), SCIP_Bool, SCIP_CALL, SCIP_OKAY, SCIP_VARSTATUS_NEGATED, SCIPaddCons(), SCIPallocBufferArray, SCIPconsGetData(), SCIPconsGetName(), SCIPconshdlrGetData(), SCIPconsIsActive(), SCIPconsIsChecked(), SCIPconsIsDeleted(), SCIPconsIsDynamic(), SCIPconsIsEnforced(), SCIPconsIsInitial(), SCIPconsIsLocal(), SCIPconsIsModifiable(), SCIPconsIsPropagated(), SCIPconsIsRemovable(), SCIPconsIsSeparated(), SCIPconsIsStickingAtNode(), SCIPcreateConsSetpack(), SCIPdebugMessage, SCIPdebugPrintCons, SCIPdelCons(), SCIPfreeBufferArray, SCIPgetNCliques(), SCIPgetNContVars(), SCIPgetNImplications(), SCIPgetNVars(), SCIPisStopped(), SCIPreleaseCons(), SCIPvarGetName(), SCIPvarGetNCliques(), SCIPvarGetNegatedVar(), SCIPvarGetNegationVar(), SCIPvarGetNImpls(), SCIPvarGetStatus(), SCIPvarIsActive(), SCIPvarIsNegated(), SCIPvarsHaveCommonClique(), and TRUE.

static SCIP_RETCODE fixDeleteOrUpgradeCons	(	SCIP *	scip,
		SCIP_CONS *	cons,
		SCIP_EVENTHDLR *	eventhdlr,
		SCIP_CONSHDLR *	conshdlrlinear,
		SCIP_CONSHDLR *	conshdlrsetppc,
		int *	nfixedvars,
		int *	nchgbds,
		int *	nchgcoefs,
		int *	ndelconss,
		int *	naddconss,
		int *	nupgdconss,
		SCIP_Bool *	cutoff
	)

static

handle all cases with less than three variables in a logicor constraint

in case a constraint has zero variables left, we detected infeasibility in case a constraint has one variables left, we will fix it to one in case a constraint has two variables left, we will add the implication and upgrade it to a set-packing constraint

Parameters

scip	SCIP data structure
cons	logic or constraint
eventhdlr	event handler to call for the event processing
conshdlrlinear	linear constraint handler, or NULL
conshdlrsetppc	setppc constraint handler, or NULL
nfixedvars	pointer to count number of fixings
nchgbds	pointer to count number of tightened bounds
nchgcoefs	pointer to count number of changed/deleted coefficients
ndelconss	pointer to count number of deleted constraints
naddconss	pointer to count number of added constraints
nupgdconss	pointer to count number of upgraded constraints
cutoff	pointer to store TRUE, if the node can be cut off

Definition at line 3545 of file cons_logicor.c.

References applyFixings(), createNormalizedLogicor(), FALSE, NULL, SCIP_Bool, SCIP_CALL, SCIP_MAXSTRLEN, SCIP_OKAY, SCIP_Real, SCIP_VARSTATUS_MULTAGGR, SCIPaddClique(), SCIPaddCons(), SCIPconsGetData(), SCIPconsGetName(), SCIPconsIsChecked(), SCIPconsIsDeleted(), SCIPconsIsDynamic(), SCIPconsIsEnforced(), SCIPconsIsInitial(), SCIPconsIsLocal(), SCIPconsIsModifiable(), SCIPconsIsPropagated(), SCIPconsIsRemovable(), SCIPconsIsSeparated(), SCIPconsIsStickingAtNode(), SCIPcreateConsLinear(), SCIPcreateConsSetpack(), SCIPdebugMessage, SCIPdebugPrintCons, SCIPdelCons(), SCIPfixVar(), SCIPgetNegatedVar(), SCIPreleaseCons(), SCIPsnprintf(), SCIPvarGetName(), SCIPvarGetStatus(), and TRUE.

Referenced by removeConstraintsDueToNegCliques().

static SCIP_RETCODE createNormalizedLogicor	(	SCIP *	scip,
		SCIP_CONS **	cons,
		const char *	name,
		int	nvars,
		SCIP_VAR **	vars,
		SCIP_Real *	vals,
		int	mult,
		SCIP_Bool	initial,
		SCIP_Bool	separate,
		SCIP_Bool	enforce,
		SCIP_Bool	check,
		SCIP_Bool	propagate,
		SCIP_Bool	local,
		SCIP_Bool	modifiable,
		SCIP_Bool	dynamic,
		SCIP_Bool	removable,
		SCIP_Bool	stickingatnode
	)

static

creates and captures a normalized (with all coefficients +1) logic or constraint

Parameters

scip	SCIP data structure
cons	pointer to hold the created constraint
name	name of constraint
nvars	number of variables in the constraint
vars	array with variables of constraint entries
vals	array with coefficients (+1.0 or -1.0)
mult	multiplier on the coefficients(+1 or -1)
initial	should the LP relaxation of constraint be in the initial LP? Usually set to TRUE. Set to FALSE for 'lazy constraints'.
separate	should the constraint be separated during LP processing? Usually set to TRUE.
enforce	should the constraint be enforced during node processing? TRUE for model constraints, FALSE for additional, redundant constraints.
check	should the constraint be checked for feasibility? TRUE for model constraints, FALSE for additional, redundant constraints.
propagate	should the constraint be propagated during node processing? Usually set to TRUE.
local	is constraint only valid locally? Usually set to FALSE. Has to be set to TRUE, e.g., for branching constraints.
modifiable	is constraint modifiable (subject to column generation)? Usually set to FALSE. In column generation applications, set to TRUE if pricing adds coefficients to this constraint.
dynamic	is constraint subject to aging? Usually set to FALSE. Set to TRUE for own cuts which are separated as constraints.
removable	should the relaxation be removed from the LP due to aging or cleanup? Usually set to FALSE. Set to TRUE for 'lazy constraints' and 'user cuts'.
stickingatnode	should the constraint always be kept at the node where it was added, even if it may be moved to a more global node? Usually set to FALSE. Set to TRUE to for constraints that represent node data.

Definition at line 3731 of file cons_logicor.c.

References NULL, SCIP_CALL, SCIP_DECL_LINCONSUPGD(), SCIP_OKAY, SCIPallocBufferArray, SCIPcreateConsLogicor(), SCIPfreeBufferArray, and SCIPgetNegatedVar().

Referenced by fixDeleteOrUpgradeCons().

static SCIP_DECL_LINCONSUPGD ( linconsUpgdLogicor )

static

Definition at line 3797 of file cons_logicor.c.

Referenced by createNormalizedLogicor().

static SCIP_DECL_CONSHDLRCOPY ( conshdlrCopyLogicor )

static

copy method for constraint handler plugins (called when SCIP copies plugins)

Definition at line 3842 of file cons_logicor.c.

static SCIP_DECL_CONSFREE ( consFreeLogicor )

static

destructor of constraint handler to free constraint handler data (called when SCIP is exiting)

Definition at line 3858 of file cons_logicor.c.

static SCIP_DECL_CONSINITPRE ( consInitpreLogicor )

static

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

Definition at line 3880 of file cons_logicor.c.

static SCIP_DECL_CONSEXITPRE ( consExitpreLogicor )

static

presolving deinitialization method of constraint handler (called after presolving has been finished)

Definition at line 3913 of file cons_logicor.c.

static SCIP_DECL_CONSEXITSOL ( consExitsolLogicor )

static

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

Definition at line 3951 of file cons_logicor.c.

References NULL, SCIP_CALL, SCIP_DECL_CONSDELETE(), SCIP_OKAY, SCIPconsGetData(), and SCIPreleaseRow().

static SCIP_DECL_CONSDELETE ( consDeleteLogicor )

static

frees specific constraint data

Definition at line 3974 of file cons_logicor.c.

Referenced by SCIP_DECL_CONSEXITSOL().

static SCIP_DECL_CONSTRANS ( consTransLogicor )

static

transforms constraint data into data belonging to the transformed problem

Definition at line 4005 of file cons_logicor.c.

static SCIP_DECL_CONSINITLP ( consInitlpLogicor )

static

LP initialization method of constraint handler (called before the initial LP relaxation at a node is solved)

Definition at line 4038 of file cons_logicor.c.

References addCut(), NULL, SCIP_CALL, SCIP_DECL_CONSSEPALP(), SCIP_OKAY, and SCIPconsIsInitial().

static SCIP_DECL_CONSSEPALP ( consSepalpLogicor )

static

separation method of constraint handler for LP solutions

Definition at line 4056 of file cons_logicor.c.

Referenced by SCIP_DECL_CONSINITLP().

static SCIP_DECL_CONSSEPASOL ( consSepasolLogicor )

static

separation method of constraint handler for arbitrary primal solutions

Definition at line 4103 of file cons_logicor.c.

static SCIP_DECL_CONSENFOLP ( consEnfolpLogicor )

static

constraint enforcing method of constraint handler for LP solutions

Definition at line 4150 of file cons_logicor.c.

static SCIP_DECL_CONSENFOPS ( consEnfopsLogicor )

static

constraint enforcing method of constraint handler for pseudo solutions

Definition at line 4200 of file cons_logicor.c.

static SCIP_DECL_CONSCHECK ( consCheckLogicor )

static

feasibility check method of constraint handler for integral solutions

Definition at line 4247 of file cons_logicor.c.

static SCIP_DECL_CONSPROP ( consPropLogicor )

static

domain propagation method of constraint handler

Definition at line 4303 of file cons_logicor.c.

static SCIP_DECL_CONSPRESOL ( consPresolLogicor )

static

presolving method of constraint handler

Definition at line 4348 of file cons_logicor.c.

static SCIP_DECL_CONSRESPROP ( consRespropLogicor )

static

propagation conflict resolving method of constraint handler

Definition at line 4560 of file cons_logicor.c.

static SCIP_DECL_CONSLOCK ( consLockLogicor )

static

variable rounding lock method of constraint handler

Definition at line 4613 of file cons_logicor.c.

static SCIP_DECL_CONSACTIVE ( consActiveLogicor )

static

constraint activation notification method of constraint handler

Definition at line 4633 of file cons_logicor.c.

static SCIP_DECL_CONSDEACTIVE ( consDeactiveLogicor )

static

constraint deactivation notification method of constraint handler

Definition at line 4672 of file cons_logicor.c.

static SCIP_DECL_CONSPRINT ( consPrintLogicor )

static

constraint display method of constraint handler

Definition at line 4713 of file cons_logicor.c.

static SCIP_DECL_CONSCOPY ( consCopyLogicor )

static

constraint copying method of constraint handler

Definition at line 4727 of file cons_logicor.c.

static SCIP_DECL_CONSPARSE ( consParseLogicor )

static

constraint parsing method of constraint handler

Definition at line 4753 of file cons_logicor.c.

static SCIP_DECL_CONSGETVARS ( consGetVarsLogicor )

static

constraint method of constraint handler which returns the variables (if possible)

Definition at line 4848 of file cons_logicor.c.

static SCIP_DECL_CONSGETNVARS ( consGetNVarsLogicor )

static

constraint method of constraint handler which returns the number of variables (if possible)

Definition at line 4870 of file cons_logicor.c.

static SCIP_DECL_EVENTEXEC ( eventExecLogicor )

static

Definition at line 4888 of file cons_logicor.c.

static SCIP_DECL_CONFLICTEXEC ( conflictExecLogicor )

static

Definition at line 4950 of file cons_logicor.c.

SCIP_RETCODE SCIPincludeConshdlrLogicor ( SCIP * scip )

creates the handler for logic or constraints and includes it in SCIP

Parameters

scip	SCIP data structure

Definition at line 5019 of file cons_logicor.c.

References CONFLICTHDLR_DESC, CONFLICTHDLR_NAME, CONFLICTHDLR_PRIORITY, CONSHDLR_CHECKPRIORITY, CONSHDLR_DELAYPROP, CONSHDLR_DELAYSEPA, CONSHDLR_DESC, CONSHDLR_EAGERFREQ, CONSHDLR_ENFOPRIORITY, CONSHDLR_MAXPREROUNDS, CONSHDLR_NAME, CONSHDLR_NEEDSCONS, CONSHDLR_PRESOLTIMING, CONSHDLR_PROP_TIMING, CONSHDLR_PROPFREQ, CONSHDLR_SEPAFREQ, CONSHDLR_SEPAPRIORITY, conshdlrdataCreate(), DEFAULT_DUALPRESOLVING, DEFAULT_IMPLICATIONS, DEFAULT_NEGATEDCLIQUE, DEFAULT_PRESOLPAIRWISE, DEFAULT_PRESOLUSEHASHING, DEFAULT_STRENGTHEN, EVENTHDLR_DESC, EVENTHDLR_NAME, LINCONSUPGD_PRIORITY, NULL, SCIP_CALL, SCIP_OKAY, SCIPaddBoolParam(), SCIPcreateConsLogicor(), SCIPfindConshdlr(), SCIPincludeConflicthdlrBasic(), SCIPincludeConshdlrBasic(), SCIPincludeEventhdlrBasic(), SCIPincludeLinconsUpgrade(), SCIPsetConshdlrActive(), SCIPsetConshdlrCopy(), SCIPsetConshdlrDeactive(), SCIPsetConshdlrDelete(), SCIPsetConshdlrExitpre(), SCIPsetConshdlrExitsol(), SCIPsetConshdlrFree(), SCIPsetConshdlrGetNVars(), SCIPsetConshdlrGetVars(), SCIPsetConshdlrInitlp(), SCIPsetConshdlrInitpre(), SCIPsetConshdlrParse(), SCIPsetConshdlrPresol(), SCIPsetConshdlrPrint(), SCIPsetConshdlrProp(), SCIPsetConshdlrResprop(), SCIPsetConshdlrSepa(), SCIPsetConshdlrTrans(), and TRUE.

Referenced by SCIPincludeDefaultPlugins().

SCIP_RETCODE SCIPcreateConsLogicor	(	SCIP *	scip,
		SCIP_CONS **	cons,
		const char *	name,
		int	nvars,
		SCIP_VAR **	vars,
		SCIP_Bool	initial,
		SCIP_Bool	separate,
		SCIP_Bool	enforce,
		SCIP_Bool	check,
		SCIP_Bool	propagate,
		SCIP_Bool	local,
		SCIP_Bool	modifiable,
		SCIP_Bool	dynamic,
		SCIP_Bool	removable,
		SCIP_Bool	stickingatnode
	)

creates and captures a logic or constraint

Note: the constraint gets captured, hence at one point you have to release it using the method SCIPreleaseCons()

Parameters

scip	SCIP data structure
cons	pointer to hold the created constraint
name	name of constraint
nvars	number of variables in the constraint
vars	array with variables of constraint entries
initial	should the LP relaxation of constraint be in the initial LP? Usually set to TRUE. Set to FALSE for 'lazy constraints'.
separate	should the constraint be separated during LP processing? Usually set to TRUE.
enforce	should the constraint be enforced during node processing? TRUE for model constraints, FALSE for additional, redundant constraints.
check	should the constraint be checked for feasibility? TRUE for model constraints, FALSE for additional, redundant constraints.
propagate	should the constraint be propagated during node processing? Usually set to TRUE.
local	is constraint only valid locally? Usually set to FALSE. Has to be set to TRUE, e.g., for branching constraints.
modifiable	is constraint modifiable (subject to column generation)? Usually set to FALSE. In column generation applications, set to TRUE if pricing adds coefficients to this constraint.
dynamic	is constraint subject to aging? Usually set to FALSE. Set to TRUE for own cuts which are separated as constraints.
removable	should the relaxation be removed from the LP due to aging or cleanup? Usually set to FALSE. Set to TRUE for 'lazy constraints' and 'user cuts'.
stickingatnode	should the constraint always be kept at the node where it was added, even if it may be moved to a more global node? Usually set to FALSE. Set to TRUE to for constraints that represent node data.

Definition at line 5111 of file cons_logicor.c.

References consdataCreate(), CONSHDLR_NAME, NULL, SCIP_CALL, SCIP_EVENTTYPE_VARFIXED, SCIP_INVALIDCALL, SCIP_OKAY, SCIP_STAGE_PRESOLVING, SCIPcatchVarEvent(), SCIPconshdlrGetData(), SCIPcreateCons(), SCIPcreateConsBasicLogicor(), SCIPerrorMessage, SCIPfindConshdlr(), SCIPgetStage(), and SCIPisTransformed().

Referenced by addLocalConss(), addSplitcons(), consdataLinearize(), createAndAddLinearCons(), createConflict(), createNormalizedLogicor(), extendToCover(), readCnf(), SCIP_DECL_CONFLICTEXEC(), SCIPcreateConsBasicLogicor(), SCIPincludeConshdlrLogicor(), SCIPreoptApplyGlbConss(), and upgradeCons().

SCIP_RETCODE SCIPcreateConsBasicLogicor	(	SCIP *	scip,
		SCIP_CONS **	cons,
		const char *	name,
		int	nvars,
		SCIP_VAR **	vars
	)

creates and captures a logicor constraint in its most basic version, i. e., all constraint flags are set to their basic value as explained for the method SCIPcreateConsLogicor(); all flags can be set via SCIPsetConsFLAGNAME-methods in scip.h

See also: SCIPcreateConsLogicor() for information about the basic constraint flag configuration

Note: the constraint gets captured, hence at one point you have to release it using the method SCIPreleaseCons()

Parameters

scip	SCIP data structure
cons	pointer to hold the created constraint
name	name of constraint
nvars	number of variables in the constraint
vars	array with variables of constraint entries

Definition at line 5188 of file cons_logicor.c.

References FALSE, NULL, SCIP_CALL, SCIP_OKAY, SCIPaddCoefLogicor(), SCIPcreateConsLogicor(), and TRUE.

Referenced by SCIPcreateConsLogicor().

SCIP_RETCODE SCIPaddCoefLogicor	(	SCIP *	scip,
		SCIP_CONS *	cons,
		SCIP_VAR *	var
	)

adds coefficient in logic or constraint

Parameters

scip	SCIP data structure
cons	logicor constraint
var	variable to add to the constraint

Definition at line 5205 of file cons_logicor.c.

References addCoef(), CONSHDLR_NAME, NULL, SCIP_CALL, SCIP_INVALIDDATA, SCIP_OKAY, SCIPconsGetHdlr(), SCIPconshdlrGetName(), SCIPerrorMessage, and SCIPgetNVarsLogicor().

Referenced by addCoefTerm(), SCIPaddCoefPseudoboolean(), and SCIPcreateConsBasicLogicor().

int SCIPgetNVarsLogicor	(	SCIP *	scip,
		SCIP_CONS *	cons
	)

gets number of variables in logic or constraint

Parameters

scip	SCIP data structure
cons	constraint data

Definition at line 5228 of file cons_logicor.c.

References CONSHDLR_NAME, NULL, SCIPABORT, SCIPconsGetData(), SCIPconsGetHdlr(), SCIPconshdlrGetName(), SCIPerrorMessage, and SCIPgetVarsLogicor().

Referenced by addLogicOrConstraints(), checkLogicor(), correctPresoldata(), createPresoldata(), extractGates(), getLinearConsNVars(), getLinearConsVarsData(), SCIP_DECL_READERWRITE(), SCIPaddCoefLogicor(), SCIPmatrixCreate(), SCIPwriteCcg(), SCIPwriteGms(), SCIPwriteLp(), SCIPwritePbm(), SCIPwritePip(), SCIPwritePpm(), writeFzn(), and writeOpbConstraints().

SCIP_VAR** SCIPgetVarsLogicor	(	SCIP *	scip,
		SCIP_CONS *	cons
	)

gets array of variables in logic or constraint

Parameters

scip	SCIP data structure
cons	constraint data

Definition at line 5249 of file cons_logicor.c.

References CONSHDLR_NAME, NULL, SCIP_Real, SCIPABORT, SCIPconsGetData(), SCIPconsGetHdlr(), SCIPconshdlrGetName(), SCIPerrorMessage, and SCIPgetDualsolLogicor().

Referenced by addLogicOrConstraints(), checkLogicor(), extractGates(), getLinearConsVarsData(), SCIP_DECL_READERWRITE(), SCIPgetNVarsLogicor(), SCIPmatrixCreate(), SCIPwriteCcg(), SCIPwriteGms(), SCIPwriteLp(), SCIPwritePbm(), SCIPwritePip(), SCIPwritePpm(), writeFzn(), and writeOpbConstraints().

SCIP_Real SCIPgetDualsolLogicor	(	SCIP *	scip,
		SCIP_CONS *	cons
	)

gets the dual solution of the logic or constraint in the current LP

Parameters

scip	SCIP data structure
cons	constraint data

Definition at line 5270 of file cons_logicor.c.

References CONSHDLR_NAME, NULL, SCIP_INVALID, SCIP_Real, SCIPABORT, SCIPconsGetData(), SCIPconsGetHdlr(), SCIPconshdlrGetName(), SCIPerrorMessage, SCIPgetDualfarkasLogicor(), and SCIProwGetDualsol().

Referenced by SCIPgetVarsLogicor().

SCIP_Real SCIPgetDualfarkasLogicor	(	SCIP *	scip,
		SCIP_CONS *	cons
	)

gets the dual Farkas value of the logic or constraint in the current infeasible LP

Parameters

scip	SCIP data structure
cons	constraint data

Definition at line 5294 of file cons_logicor.c.

References CONSHDLR_NAME, NULL, SCIP_INVALID, SCIPABORT, SCIPconsGetData(), SCIPconsGetHdlr(), SCIPconshdlrGetName(), SCIPerrorMessage, SCIPgetRowLogicor(), and SCIProwGetDualfarkas().

Referenced by SCIPgetDualsolLogicor().

SCIP_ROW* SCIPgetRowLogicor	(	SCIP *	scip,
		SCIP_CONS *	cons
	)

returns the linear relaxation of the given logic or constraint; may return NULL if no LP row was yet created; the user must not modify the row!

Parameters

scip	SCIP data structure
cons	constraint data

Definition at line 5320 of file cons_logicor.c.

References CONSHDLR_NAME, NULL, SCIPABORT, SCIPconsGetData(), SCIPconsGetHdlr(), SCIPconshdlrGetName(), and SCIPerrorMessage.

Referenced by SCIPgetDualfarkasLogicor().

SCIP

Detailed Description

Macros

Functions

Macro Definition Documentation

Function Documentation