presol.c File Reference

Detailed Description

methods for presolvers

Author

Tobias Achterberg

Timo Berthold

Definition in file presol.c.

#include <assert.h>
#include <string.h>
#include "scip/def.h"
#include "blockmemshell/memory.h"
#include "scip/set.h"
#include "scip/clock.h"
#include "scip/paramset.h"
#include "scip/scip.h"
#include "scip/pub_misc.h"
#include "scip/presol.h"
#include "scip/struct_presol.h"

Go to the source code of this file.

Functions
	SCIP_DECL_SORTPTRCOMP (SCIPpresolComp)
	SCIP_DECL_SORTPTRCOMP (SCIPpresolCompName)
static	SCIP_DECL_PARAMCHGD (paramChgdPresolPriority)
SCIP_RETCODE	SCIPpresolCopyInclude (SCIP_PRESOL *presol, SCIP_SET *set)
SCIP_RETCODE	SCIPpresolCreate (SCIP_PRESOL **presol, SCIP_SET *set, SCIP_MESSAGEHDLR *messagehdlr, BMS_BLKMEM *blkmem, const char *name, const char *desc, int priority, int maxrounds, SCIP_PRESOLTIMING timing, SCIP_DECL_PRESOLCOPY((*presolcopy)), SCIP_DECL_PRESOLFREE((*presolfree)), SCIP_DECL_PRESOLINIT((*presolinit)), SCIP_DECL_PRESOLEXIT((*presolexit)), SCIP_DECL_PRESOLINITPRE((*presolinitpre)), SCIP_DECL_PRESOLEXITPRE((*presolexitpre)), SCIP_DECL_PRESOLEXEC((*presolexec)), SCIP_PRESOLDATA *presoldata)
SCIP_RETCODE	SCIPpresolFree (SCIP_PRESOL **presol, SCIP_SET *set)
SCIP_RETCODE	SCIPpresolInit (SCIP_PRESOL *presol, SCIP_SET *set)
SCIP_RETCODE	SCIPpresolExit (SCIP_PRESOL *presol, SCIP_SET *set)
SCIP_RETCODE	SCIPpresolInitpre (SCIP_PRESOL *presol, SCIP_SET *set)
SCIP_RETCODE	SCIPpresolExitpre (SCIP_PRESOL *presol, SCIP_SET *set)
SCIP_RETCODE	SCIPpresolExec (SCIP_PRESOL *presol, SCIP_SET *set, SCIP_PRESOLTIMING timing, int nrounds, int *nfixedvars, int *naggrvars, int *nchgvartypes, int *nchgbds, int *naddholes, int *ndelconss, int *naddconss, int *nupgdconss, int *nchgcoefs, int *nchgsides, SCIP_RESULT *result)
SCIP_PRESOLDATA *	SCIPpresolGetData (SCIP_PRESOL *presol)
void	SCIPpresolSetData (SCIP_PRESOL *presol, SCIP_PRESOLDATA *presoldata)
void	SCIPpresolSetCopy (SCIP_PRESOL *presol, SCIP_DECL_PRESOLCOPY((*presolcopy)))
void	SCIPpresolSetFree (SCIP_PRESOL *presol, SCIP_DECL_PRESOLFREE((*presolfree)))
void	SCIPpresolSetInit (SCIP_PRESOL *presol, SCIP_DECL_PRESOLINIT((*presolinit)))
void	SCIPpresolSetExit (SCIP_PRESOL *presol, SCIP_DECL_PRESOLEXIT((*presolexit)))
void	SCIPpresolSetInitpre (SCIP_PRESOL *presol, SCIP_DECL_PRESOLINITPRE((*presolinitpre)))
void	SCIPpresolSetExitpre (SCIP_PRESOL *presol, SCIP_DECL_PRESOLEXITPRE((*presolexitpre)))
const char *	SCIPpresolGetName (SCIP_PRESOL *presol)
const char *	SCIPpresolGetDesc (SCIP_PRESOL *presol)
int	SCIPpresolGetPriority (SCIP_PRESOL *presol)
int	SCIPpresolGetMaxrounds (SCIP_PRESOL *presol)
void	SCIPpresolSetPriority (SCIP_PRESOL *presol, SCIP_SET *set, int priority)
SCIP_PRESOLTIMING	SCIPpresolGetTiming (SCIP_PRESOL *presol)
void	SCIPpresolSetTiming (SCIP_PRESOL *presol, SCIP_PRESOLTIMING timing)
SCIP_Bool	SCIPpresolIsInitialized (SCIP_PRESOL *presol)
void	SCIPpresolEnableOrDisableClocks (SCIP_PRESOL *presol, SCIP_Bool enable)
SCIP_Real	SCIPpresolGetSetupTime (SCIP_PRESOL *presol)
SCIP_Real	SCIPpresolGetTime (SCIP_PRESOL *presol)
int	SCIPpresolGetNFixedVars (SCIP_PRESOL *presol)
int	SCIPpresolGetNAggrVars (SCIP_PRESOL *presol)
int	SCIPpresolGetNChgVarTypes (SCIP_PRESOL *presol)
int	SCIPpresolGetNChgBds (SCIP_PRESOL *presol)
int	SCIPpresolGetNAddHoles (SCIP_PRESOL *presol)
int	SCIPpresolGetNDelConss (SCIP_PRESOL *presol)
int	SCIPpresolGetNAddConss (SCIP_PRESOL *presol)
int	SCIPpresolGetNUpgdConss (SCIP_PRESOL *presol)
int	SCIPpresolGetNChgCoefs (SCIP_PRESOL *presol)
int	SCIPpresolGetNChgSides (SCIP_PRESOL *presol)
int	SCIPpresolGetNCalls (SCIP_PRESOL *presol)

Function Documentation

SCIP_DECL_PARAMCHGD()

static SCIP_DECL_PARAMCHGD ( paramChgdPresolPriority  )

static

method to call, when the priority of a presolver was changed

Definition at line 60 of file presol.c.

References SCIP_CALL, SCIP_OKAY, SCIPparamGetData(), SCIPparamGetInt(), and SCIPsetPresolPriority().

SCIPpresolCopyInclude()

SCIP_RETCODE SCIPpresolCopyInclude	(	SCIP_PRESOL *	presol,
		SCIP_SET *	set
	)

copies the given presolver to a new scip

Parameters

presol	presolver
set	SCIP_SET of SCIP to copy to

Definition at line 74 of file presol.c.

References SCIP_CALL, SCIP_OKAY, SCIPpresolGetName(), and SCIPsetDebugMsg.

SCIPpresolCreate()

SCIP_RETCODE SCIPpresolCreate	(	SCIP_PRESOL **	presol,
		SCIP_SET *	set,
		SCIP_MESSAGEHDLR *	messagehdlr,
		BMS_BLKMEM *	blkmem,
		const char *	name,
		const char *	desc,
		int	priority,
		int	maxrounds,
		SCIP_PRESOLTIMING	timing,
		SCIP_DECL_PRESOLCOPY((*presolcopy))	,
		SCIP_DECL_PRESOLFREE((*presolfree))	,
		SCIP_DECL_PRESOLINIT((*presolinit))	,
		SCIP_DECL_PRESOLEXIT((*presolexit))	,
		SCIP_DECL_PRESOLINITPRE((*presolinitpre))	,
		SCIP_DECL_PRESOLEXITPRE((*presolexitpre))	,
		SCIP_DECL_PRESOLEXEC((*presolexec))	,
		SCIP_PRESOLDATA *	presoldata
	)

creates a presolver

Parameters

presol	pointer to store presolver
set	global SCIP settings
messagehdlr	message handler
blkmem	block memory for parameter settings
name	name of presolver
desc	description of presolver
priority	priority of the presolver (>= 0: before, < 0: after constraint handlers)
maxrounds	maximal number of presolving rounds the presolver participates in (-1: no limit)
timing	timing mask of the presolver
presoldata	presolver data

Definition at line 92 of file presol.c.

References BMSallocMemory, BMSduplicateMemoryArray, FALSE, SCIP_ALLOC, SCIP_CALL, SCIP_CLOCKTYPE_DEFAULT, SCIP_MAXSTRLEN, SCIP_OKAY, SCIP_PARAMETERWRONGVAL, SCIP_PRESOLTIMING_EXHAUSTIVE, SCIP_PRESOLTIMING_FAST, SCIP_PRESOLTIMING_FINAL, SCIP_PRESOLTIMING_MAX, SCIP_PRESOLTIMING_MEDIUM, SCIPclockCreate(), SCIPmessagePrintError(), SCIPsetAddIntParam(), SCIPsnprintf(), and TRUE.

Referenced by SCIPincludePresol(), and SCIPincludePresolBasic().

SCIPpresolFree()

SCIP_RETCODE SCIPpresolFree	(	SCIP_PRESOL **	presol,
		SCIP_SET *	set
	)

frees memory of presolver

Parameters

presol	pointer to presolver data structure
set	global SCIP settings

Definition at line 167 of file presol.c.

References BMSfreeMemory, BMSfreeMemoryArray, SCIP_CALL, SCIP_OKAY, and SCIPclockFree().

SCIPpresolInit()

SCIP_RETCODE SCIPpresolInit	(	SCIP_PRESOL *	presol,
		SCIP_SET *	set
	)

initializes presolver

Parameters

presol	presolver
set	global SCIP settings

Definition at line 193 of file presol.c.

References SCIP_Presol::initialized, SCIP_Presol::lastnaddconss, SCIP_Presol::lastnaddholes, SCIP_Presol::lastnaggrvars, SCIP_Presol::lastnchgbds, SCIP_Presol::lastnchgcoefs, SCIP_Presol::lastnchgsides, SCIP_Presol::lastnchgvartypes, SCIP_Presol::lastndelconss, SCIP_Presol::lastnfixedvars, SCIP_Presol::lastnupgdconss, SCIP_Presol::naddconss, SCIP_Presol::naddholes, SCIP_Presol::naggrvars, SCIP_Presol::name, SCIP_Presol::ncalls, SCIP_Presol::nchgbds, SCIP_Presol::nchgcoefs, SCIP_Presol::nchgsides, SCIP_Presol::nchgvartypes, SCIP_Presol::ndelconss, SCIP_Presol::nfixedvars, SCIP_Presol::nupgdconss, SCIP_Presol::presolclock, SCIP_CALL, SCIP_INVALIDCALL, SCIP_OKAY, SCIPclockReset(), SCIPclockStart(), SCIPclockStop(), SCIPerrorMessage, SCIP_Presol::setuptime, and TRUE.

Referenced by SCIPsetSetPriorityNlpi().

SCIPpresolExit()

SCIP_RETCODE SCIPpresolExit	(	SCIP_PRESOL *	presol,
		SCIP_SET *	set
	)

deinitializes presolver

Parameters

presol	presolver
set	global SCIP settings

Definition at line 252 of file presol.c.

References FALSE, SCIP_Presol::initialized, SCIP_Presol::name, SCIP_CALL, SCIP_INVALIDCALL, SCIP_OKAY, SCIPclockStart(), SCIPclockStop(), SCIPerrorMessage, and SCIP_Presol::setuptime.

Referenced by SCIPsetInitPlugins().

SCIPpresolInitpre()

SCIP_RETCODE SCIPpresolInitpre	(	SCIP_PRESOL *	presol,
		SCIP_SET *	set
	)

informs presolver that the presolving process is being started

Parameters

presol	presolver
set	global SCIP settings

Definition at line 283 of file presol.c.

References SCIP_Presol::lastnaddconss, SCIP_Presol::lastnaddholes, SCIP_Presol::lastnaggrvars, SCIP_Presol::lastnchgbds, SCIP_Presol::lastnchgcoefs, SCIP_Presol::lastnchgsides, SCIP_Presol::lastnchgvartypes, SCIP_Presol::lastndelconss, SCIP_Presol::lastnfixedvars, SCIP_Presol::lastnupgdconss, SCIP_CALL, SCIP_OKAY, SCIPclockStart(), SCIPclockStop(), and SCIP_Presol::setuptime.

Referenced by SCIPsetExitPlugins().

SCIPpresolExitpre()

SCIP_RETCODE SCIPpresolExitpre	(	SCIP_PRESOL *	presol,
		SCIP_SET *	set
	)

informs presolver that the presolving process is finished

Parameters

presol	presolver
set	global SCIP settings

Definition at line 318 of file presol.c.

References SCIP_CALL, SCIP_OKAY, SCIPclockStart(), SCIPclockStop(), and SCIP_Presol::setuptime.

Referenced by SCIPsetExitPlugins().

SCIPpresolExec()

SCIP_RETCODE SCIPpresolExec	(	SCIP_PRESOL *	presol,
		SCIP_SET *	set,
		SCIP_PRESOLTIMING	timing,
		int	nrounds,
		int *	nfixedvars,
		int *	naggrvars,
		int *	nchgvartypes,
		int *	nchgbds,
		int *	naddholes,
		int *	ndelconss,
		int *	naddconss,
		int *	nupgdconss,
		int *	nchgcoefs,
		int *	nchgsides,
		SCIP_RESULT *	result
	)

executes presolver

Parameters

presol	presolver
set	global SCIP settings
timing	current presolving timing
nrounds	number of presolving rounds already done
nfixedvars	pointer to total number of variables fixed of all presolvers
naggrvars	pointer to total number of variables aggregated of all presolvers
nchgvartypes	pointer to total number of variable type changes of all presolvers
nchgbds	pointer to total number of variable bounds tightened of all presolvers
naddholes	pointer to total number of domain holes added of all presolvers
ndelconss	pointer to total number of deleted constraints of all presolvers
naddconss	pointer to total number of added constraints of all presolvers
nupgdconss	pointer to total number of upgraded constraints of all presolvers
nchgcoefs	pointer to total number of changed coefficients of all presolvers
nchgsides	pointer to total number of changed left/right hand sides of all presolvers
result	pointer to store the result of the callback method

Definition at line 342 of file presol.c.

References SCIP_Presol::lastnaddconss, SCIP_Presol::lastnaddholes, SCIP_Presol::lastnaggrvars, SCIP_Presol::lastnchgbds, SCIP_Presol::lastnchgcoefs, SCIP_Presol::lastnchgsides, SCIP_Presol::lastnchgvartypes, SCIP_Presol::lastndelconss, SCIP_Presol::lastnfixedvars, SCIP_Presol::lastnupgdconss, SCIP_Presol::maxrounds, SCIP_Presol::naddconss, SCIP_Presol::naddholes, SCIP_Presol::naggrvars, SCIP_Presol::name, SCIP_Presol::ncalls, SCIP_Presol::nchgbds, SCIP_Presol::nchgcoefs, SCIP_Presol::nchgsides, SCIP_Presol::nchgvartypes, SCIP_Presol::ndelconss, SCIP_Presol::nfixedvars, SCIP_Presol::nupgdconss, SCIP_Presol::presolclock, SCIP_CALL, SCIP_CUTOFF, SCIP_DIDNOTFIND, SCIP_DIDNOTRUN, SCIP_INVALIDRESULT, SCIP_OKAY, SCIP_SUCCESS, SCIP_UNBOUNDED, SCIPclockStart(), SCIPclockStop(), SCIPerrorMessage, SCIPsetDebugMsg, and SCIP_Presol::timing.

Referenced by presolveRound().

SCIPpresolSetCopy()

void SCIPpresolSetCopy	(	SCIP_PRESOL *	presol,
		SCIP_DECL_PRESOLCOPY((*presolcopy))
	)

sets copy method of presolver

Parameters

presol

presolver

Definition at line 487 of file presol.c.

Referenced by SCIPsetPresolCopy().

SCIPpresolSetFree()

void SCIPpresolSetFree	(	SCIP_PRESOL *	presol,
		SCIP_DECL_PRESOLFREE((*presolfree))
	)

sets destructor method of presolver

Parameters

presol

presolver

Definition at line 498 of file presol.c.

Referenced by SCIPsetPresolFree().

SCIPpresolSetInit()

void SCIPpresolSetInit	(	SCIP_PRESOL *	presol,
		SCIP_DECL_PRESOLINIT((*presolinit))
	)

sets initialization method of presolver

Parameters

presol

presolver

Definition at line 509 of file presol.c.

Referenced by SCIPsetPresolInit().

SCIPpresolSetExit()

void SCIPpresolSetExit	(	SCIP_PRESOL *	presol,
		SCIP_DECL_PRESOLEXIT((*presolexit))
	)

sets deinitialization method of presolver

Parameters

presol

presolver

Definition at line 520 of file presol.c.

Referenced by SCIPsetPresolExit().

SCIPpresolSetInitpre()

void SCIPpresolSetInitpre	(	SCIP_PRESOL *	presol,
		SCIP_DECL_PRESOLINITPRE((*presolinitpre))
	)

sets solving process initialization method of presolver

Parameters

presol

presolver

Definition at line 531 of file presol.c.

Referenced by SCIPsetPresolInitpre().

SCIPpresolSetExitpre()

void SCIPpresolSetExitpre	(	SCIP_PRESOL *	presol,
		SCIP_DECL_PRESOLEXITPRE((*presolexitpre))
	)

sets solving process deinitialization method of presolver

Parameters

presol

presolver

Definition at line 542 of file presol.c.

Referenced by SCIPsetPresolExitpre().

SCIPpresolSetPriority()

void SCIPpresolSetPriority	(	SCIP_PRESOL *	presol,
		SCIP_SET *	set,
		int	priority
	)

sets priority of presolver

Parameters

presol	presolver
set	global SCIP settings
priority	new priority of the presolver

Definition at line 593 of file presol.c.

References FALSE, and SCIP_Presol::priority.

Referenced by SCIPsetPresolPriority().

SCIPpresolEnableOrDisableClocks()

void SCIPpresolEnableOrDisableClocks	(	SCIP_PRESOL *	presol,
		SCIP_Bool	enable
	)

enables or disables all clocks of presol, depending on the value of the flag

Parameters

presol	the presolver for which all clocks should be enabled or disabled
enable	should the clocks of the presolver be enabled?

Definition at line 639 of file presol.c.

References SCIP_Presol::presolclock, SCIPclockEnableOrDisable(), and SCIP_Presol::setuptime.