Detailed Description

cancel nonzeros of the constraint matrix based on the columns

Author: Dieter Weninger; Leona Gottwald; Ambros Gleixner; Weikun Chen

This presolver attempts to cancel non-zero entries of the constraint matrix by adding scaled columns to other columns.

In more detail, for two columns A_{j.} and A_{k.}, suppose for a given value s, we have

             | A_{j.} | - | A_{j.} - s*A_{k.} | > eta,

where eta is an nonnegative integer. Then we introduce a new variable y := s*x_j + x_k and aggregate the variable x_k = y - s*x_j. After aggregation, the column of the variable x_j is A_{j.} + s*A_{j.} which is sparser than A_{j.}. In the case that x_k is nonimplied free variable, we need to add a new constraint l_k <= y - weight*x_j <= u_k into the problem to keep the bounds constraints of variable x_k.

Further information can be found in Chen et al. "Two-row and two-column mixed-integer presolve using hasing-based pairing methods".

Definition in file presol_dualsparsify.c.

#include "blockmemshell/memory.h"
#include "scip/cons_linear.h"
#include "scip/debug.h"
#include "scip/presol_dualsparsify.h"
#include "scip/pub_cons.h"
#include "scip/pub_matrix.h"
#include "scip/pub_message.h"
#include "scip/pub_misc.h"
#include "scip/pub_misc_sort.h"
#include "scip/pub_presol.h"
#include "scip/pub_var.h"
#include "scip/scip_cons.h"
#include "scip/scip_general.h"
#include "scip/scip_mem.h"
#include "scip/scip_message.h"
#include "scip/scip_nlp.h"
#include "scip/scip_numerics.h"
#include "scip/scip_param.h"
#include "scip/scip_presol.h"
#include "scip/scip_pricer.h"
#include "scip/scip_prob.h"
#include "scip/scip_probing.h"
#include "scip/scip_solvingstats.h"
#include "scip/scip_timing.h"
#include "scip/scip_var.h"
#include <string.h>

Go to the source code of this file.

Data Structures
struct	ColConsPair

Macros
#define	PRESOL_NAME "dualsparsify"

#define	PRESOL_DESC "eliminate non-zero coefficients"

#define	PRESOL_PRIORITY -240000

#define	PRESOL_MAXROUNDS -1

#define	PRESOL_TIMING SCIP_PRESOLTIMING_EXHAUSTIVE /* timing of the presolver (fast, medium, or exhaustive) */

#define	DEFAULT_ENABLECOPY TRUE

#define	DEFAULT_PRESERVEINTCOEFS FALSE

#define	DEFAULT_PRESERVEGOODLOCKS FALSE

#define	DEFAULT_MAX_CONT_FILLIN 1

#define	DEFAULT_MAX_BIN_FILLIN 1

#define	DEFAULT_MAX_INT_FILLIN 1

#define	DEFAULT_MAXCONSIDEREDNONZEROS 70

#define	DEFAULT_MINELIMINATEDNONZEROS 100

#define	DEFAULT_MAXRETRIEVEFAC 100.0

#define	DEFAULT_WAITINGFAC 2.0

#define	MAXSCALE 1000.0

Typedefs
typedef struct ColConsPair	COLCONSPAIR

Functions
static	SCIP_DECL_HASHKEYEQ (consPairsEqual)

static	SCIP_DECL_HASHKEYVAL (consPairHashval)

static SCIP_Real	getMaxActivitySingleRowWithoutCol (SCIP scip, SCIP_MATRIX matrix, int row, int col)

static SCIP_Real	getMinActivitySingleRowWithoutCol (SCIP scip, SCIP_MATRIX matrix, int row, int col)

static void	getMinMaxActivityResiduals (SCIP scip, SCIP_MATRIX matrix, int col, int row, SCIP_Real val, SCIP_Real minresactivity, SCIP_Real maxresactivity, SCIP_Bool isminsettoinfinity, SCIP_Bool ismaxsettoinfinity)

static void	getVarBoundsOfRow (SCIP scip, SCIP_MATRIX matrix, int col, int row, SCIP_Real val, SCIP_Real rowub, SCIP_Bool ubfound, SCIP_Real rowlb, SCIP_Bool lbfound)

static void	getImpliedBounds (SCIP scip, SCIP_MATRIX matrix, int col, SCIP_Bool ubimplied, SCIP_Bool lbimplied)

static SCIP_RETCODE	aggregation (SCIP scip, SCIP_MATRIX matrix, SCIP_PRESOLDATA presoldata, SCIP_VAR *vars, int colidx1, int colidx2, SCIP_Bool isimpliedfree, SCIP_Real weight1)

static SCIP_RETCODE	cancelCol (SCIP scip, SCIP_MATRIX matrix, SCIP_PRESOLDATA presoldata, SCIP_HASHTABLE pairtable, SCIP_Bool ishashingcols, SCIP_VAR vars, SCIP_Bool isblockedvar, int colidx, int maxcontfillin, int maxintfillin, int maxbinfillin, int maxconsiderednonzeros, SCIP_Bool preserveintcoefs, SCIP_Longint nuseless, int nchgcoefs, int ncanceled, int nfillin, SCIP_Bool isaddedcons)

static void	updateFailureStatistic (SCIP_PRESOLDATA *presoldata, SCIP_Bool success)

static	SCIP_DECL_PRESOLCOPY (presolCopyDualsparsify)

static	SCIP_DECL_PRESOLEXEC (presolExecDualsparsify)

static	SCIP_DECL_PRESOLFREE (presolFreeDualsparsify)

static	SCIP_DECL_PRESOLINIT (presolInitDualsparsify)

SCIP_RETCODE	SCIPincludePresolDualsparsify (SCIP *scip)

Macro Definition Documentation

◆ PRESOL_NAME

#define PRESOL_NAME "dualsparsify"

Definition at line 80 of file presol_dualsparsify.c.

◆ PRESOL_DESC

#define PRESOL_DESC "eliminate non-zero coefficients"

Definition at line 81 of file presol_dualsparsify.c.

◆ PRESOL_PRIORITY

#define PRESOL_PRIORITY -240000

priority of the presolver (>= 0: before, < 0: after constraint handlers)

Definition at line 83 of file presol_dualsparsify.c.

◆ PRESOL_MAXROUNDS

#define PRESOL_MAXROUNDS -1

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

Definition at line 84 of file presol_dualsparsify.c.

◆ PRESOL_TIMING

#define PRESOL_TIMING SCIP_PRESOLTIMING_EXHAUSTIVE /* timing of the presolver (fast, medium, or exhaustive) */

Definition at line 85 of file presol_dualsparsify.c.

◆ DEFAULT_ENABLECOPY

#define DEFAULT_ENABLECOPY TRUE

should dualsparsify presolver be copied to sub-SCIPs?

Definition at line 87 of file presol_dualsparsify.c.

◆ DEFAULT_PRESERVEINTCOEFS

#define DEFAULT_PRESERVEINTCOEFS FALSE

should we forbid cancellations that destroy integer coefficients?

Definition at line 88 of file presol_dualsparsify.c.

◆ DEFAULT_PRESERVEGOODLOCKS

#define DEFAULT_PRESERVEGOODLOCKS FALSE

should we preserve good locked properties of variables (at most one lock in one direction)?

Definition at line 89 of file presol_dualsparsify.c.

◆ DEFAULT_MAX_CONT_FILLIN

#define DEFAULT_MAX_CONT_FILLIN 1

default value for the maximal fillin for continuous variables

Definition at line 90 of file presol_dualsparsify.c.

◆ DEFAULT_MAX_BIN_FILLIN

#define DEFAULT_MAX_BIN_FILLIN 1

default value for the maximal fillin for binary variables

Definition at line 91 of file presol_dualsparsify.c.

◆ DEFAULT_MAX_INT_FILLIN

#define DEFAULT_MAX_INT_FILLIN 1

default value for the maximal fillin for integer variables (including binary)

Definition at line 92 of file presol_dualsparsify.c.

◆ DEFAULT_MAXCONSIDEREDNONZEROS

#define DEFAULT_MAXCONSIDEREDNONZEROS 70

maximal number of considered nonzeros within one column (-1: no limit)

Definition at line 93 of file presol_dualsparsify.c.

◆ DEFAULT_MINELIMINATEDNONZEROS

#define DEFAULT_MINELIMINATEDNONZEROS 100

minimal eleminated nonzeros within one column if we need to add a constraint to the problem

Definition at line 94 of file presol_dualsparsify.c.

◆ DEFAULT_MAXRETRIEVEFAC

#define DEFAULT_MAXRETRIEVEFAC 100.0

limit on the number of useless vs. useful hashtable retrieves as a multiple of the number of constraints

Definition at line 95 of file presol_dualsparsify.c.

◆ DEFAULT_WAITINGFAC

#define DEFAULT_WAITINGFAC 2.0

number of calls to wait until next execution as a multiple of the number of useless calls

Definition at line 96 of file presol_dualsparsify.c.

◆ MAXSCALE

#define MAXSCALE 1000.0

maximal allowed scale for cancelling nonzeros

Definition at line 98 of file presol_dualsparsify.c.

Typedef Documentation

◆ COLCONSPAIR

typedef struct ColConsPair COLCONSPAIR

Definition at line 133 of file presol_dualsparsify.c.

Function Documentation

◆ SCIP_DECL_HASHKEYEQ()

static SCIP_DECL_HASHKEYEQ ( consPairsEqual )

static

returns TRUE iff both keys are equal

Definition at line 141 of file presol_dualsparsify.c.

References ColConsPair::conscoef1, ColConsPair::conscoef2, ColConsPair::consindex1, ColConsPair::consindex2, FALSE, SCIP_Real, and SCIPisEQ().

◆ SCIP_DECL_HASHKEYVAL()

static SCIP_DECL_HASHKEYVAL ( consPairHashval )

static

returns the hash value of the key

Definition at line 167 of file presol_dualsparsify.c.

References ColConsPair::conscoef1, ColConsPair::conscoef2, ColConsPair::consindex1, ColConsPair::consindex2, SCIPhashThree, and SCIPrealHashCode().

◆ getMaxActivitySingleRowWithoutCol()

static SCIP_Real getMaxActivitySingleRowWithoutCol	(	SCIP *	scip,
		SCIP_MATRIX *	matrix,
		int	row,
		int	col
	)

static

calculate maximal activity of one row without one specific column

Parameters

scip	SCIP main data structure
matrix	matrix containing the constraints
row	row index
col	column index

Definition at line 178 of file presol_dualsparsify.c.

References NULL, SCIP_Real, SCIPisInfinity(), SCIPmatrixGetColLb(), SCIPmatrixGetColUb(), SCIPmatrixGetRowIdxPtr(), SCIPmatrixGetRowNNonzs(), and SCIPmatrixGetRowValPtr().

Referenced by getMinMaxActivityResiduals().

◆ getMinActivitySingleRowWithoutCol()

static SCIP_Real getMinActivitySingleRowWithoutCol	(	SCIP *	scip,
		SCIP_MATRIX *	matrix,
		int	row,
		int	col
	)

static

calculate minimal activity of one row without one specific column

Parameters

scip	SCIP main data structure
matrix	matrix containing the constraints
row	row index
col	column index

Definition at line 232 of file presol_dualsparsify.c.

References NULL, SCIP_Real, SCIPisInfinity(), SCIPmatrixGetColLb(), SCIPmatrixGetColUb(), SCIPmatrixGetRowIdxPtr(), SCIPmatrixGetRowNNonzs(), and SCIPmatrixGetRowValPtr().

Referenced by getMinMaxActivityResiduals().

◆ getMinMaxActivityResiduals()

static void getMinMaxActivityResiduals	(	SCIP *	scip,
		SCIP_MATRIX *	matrix,
		int	col,
		int	row,
		SCIP_Real	val,
		SCIP_Real *	minresactivity,
		SCIP_Real *	maxresactivity,
		SCIP_Bool *	isminsettoinfinity,
		SCIP_Bool *	ismaxsettoinfinity
	)

static

get minimal and maximal residual activity without one specified column

Parameters

scip	SCIP main data structure
matrix	matrix containing the constraints
col	column index
row	row index
val	coefficient of this variable in this row
minresactivity	minimum residual activity of this row
maxresactivity	maximum residual activity of this row
isminsettoinfinity	flag indicating if minresactiviy is set to infinity
ismaxsettoinfinity	flag indicating if maxresactiviy is set to infinity

Definition at line 286 of file presol_dualsparsify.c.

References FALSE, getMaxActivitySingleRowWithoutCol(), getMinActivitySingleRowWithoutCol(), NULL, SCIP_Real, SCIPinfinity(), SCIPisInfinity(), SCIPmatrixGetColLb(), SCIPmatrixGetColUb(), SCIPmatrixGetRowMaxActivity(), SCIPmatrixGetRowMinActivity(), SCIPmatrixGetRowNMaxActNegInf(), SCIPmatrixGetRowNMaxActPosInf(), SCIPmatrixGetRowNMinActNegInf(), SCIPmatrixGetRowNMinActPosInf(), and TRUE.

Referenced by getVarBoundsOfRow().

◆ getVarBoundsOfRow()

static void getVarBoundsOfRow	(	SCIP *	scip,
		SCIP_MATRIX *	matrix,
		int	col,
		int	row,
		SCIP_Real	val,
		SCIP_Real *	rowub,
		SCIP_Bool *	ubfound,
		SCIP_Real *	rowlb,
		SCIP_Bool *	lbfound
	)

static

calculate the upper and lower bound of one variable from one row

Parameters

scip	SCIP main data structure
matrix	matrix containing the constraints
col	column index of variable
row	row index
val	coefficient of this column in this row
rowub	upper bound of row
ubfound	flag indicating that an upper bound was calculated
rowlb	lower bound of row
lbfound	flag indicating that a lower bound was caluclated

Definition at line 424 of file presol_dualsparsify.c.

References FALSE, getMinMaxActivityResiduals(), NULL, SCIP_Bool, SCIP_Real, SCIPinfinity(), SCIPisInfinity(), SCIPmatrixGetRowLhs(), SCIPmatrixGetRowRhs(), and TRUE.

Referenced by getImpliedBounds().

◆ getImpliedBounds()

static void getImpliedBounds	(	SCIP *	scip,
		SCIP_MATRIX *	matrix,
		int	col,
		SCIP_Bool *	ubimplied,
		SCIP_Bool *	lbimplied
	)

static

detect implied variable bounds

Parameters

scip	SCIP main data structure
matrix	matrix containing the constraints
col	column index for implied free test
ubimplied	flag indicating an implied upper bound
lbimplied	flag indicating an implied lower bound

Definition at line 492 of file presol_dualsparsify.c.

References FALSE, getVarBoundsOfRow(), NULL, SCIP_Bool, SCIP_Real, SCIPinfinity(), SCIPisGE(), SCIPisInfinity(), SCIPisLE(), SCIPmatrixGetColIdxPtr(), SCIPmatrixGetColLb(), SCIPmatrixGetColNNonzs(), SCIPmatrixGetColUb(), SCIPmatrixGetColValPtr(), and TRUE.

Referenced by aggregation(), cancelCol(), and SCIP_DECL_PRESOLEXEC().

◆ aggregation()

static SCIP_RETCODE aggregation	(	SCIP *	scip,
		SCIP_MATRIX *	matrix,
		SCIP_PRESOLDATA *	presoldata,
		SCIP_VAR **	vars,
		int	colidx1,
		int	colidx2,
		SCIP_Bool	isimpliedfree,
		SCIP_Real	weight1
	)

static

y = weight1 * var[colidx1] + var[colidx2]

Parameters

scip	SCIP datastructure
matrix	matrix datastructure
presoldata	presolver data
vars	the current variables
colidx1	one of the indexes of column to try nonzero cancellation for
colidx2	one of the indexes of column to try nonzero cancellation for
isimpliedfree	is the aggregated variable implied free?
weight1	weight variable one in the aggregated expression

Definition at line 553 of file presol_dualsparsify.c.

References FALSE, getImpliedBounds(), NULL, SCIP_Bool, SCIP_CALL, SCIP_IMPLINTTYPE_NONE, SCIP_IMPLINTTYPE_WEAK, SCIP_MAXSTRLEN, SCIP_OKAY, SCIP_Real, SCIP_VARTYPE_CONTINUOUS, SCIP_VARTYPE_INTEGER, SCIPaddCons(), SCIPaddVar(), SCIPcreateConsLinear(), SCIPcreateVarImpl(), SCIPdebugAddSolVal, SCIPdebugGetSolVal, SCIPdebugMsg, SCIPdebugPrintCons, SCIPdoNotMultaggrVar(), SCIPinfinity(), SCIPisInfinity(), SCIPisSumZero(), SCIPmatrixRemoveColumnBounds(), SCIPmultiaggregateVar(), SCIPreleaseCons(), SCIPreleaseVar(), SCIPsnprintf(), SCIPvarGetLbGlobal(), SCIPvarGetName(), SCIPvarGetUbGlobal(), SCIPvarIsImpliedIntegral(), SCIPvarIsInitial(), SCIPvarIsIntegral(), SCIPvarIsRemovable(), and TRUE.

Referenced by cancelCol().

◆ cancelCol()

static SCIP_RETCODE cancelCol	(	SCIP *	scip,
		SCIP_MATRIX *	matrix,
		SCIP_PRESOLDATA *	presoldata,
		SCIP_HASHTABLE *	pairtable,
		SCIP_Bool *	ishashingcols,
		SCIP_VAR **	vars,
		SCIP_Bool *	isblockedvar,
		int	colidx,
		int	maxcontfillin,
		int	maxintfillin,
		int	maxbinfillin,
		int	maxconsiderednonzeros,
		SCIP_Bool	preserveintcoefs,
		SCIP_Longint *	nuseless,
		int *	nchgcoefs,
		int *	ncanceled,
		int *	nfillin,
		SCIP_Bool	isaddedcons
	)

static

try nonzero cancellation for given column

Parameters

scip	SCIP datastructure
matrix	the constraint matrix
presoldata	presolver data
pairtable	the hashtable containing COLCONSPAIR's of equations
ishashingcols	array to indicates whether it is impliedfree or not
vars	array to store the current variables
isblockedvar	array to indicates whether it is blocked or not
colidx	index of column to try nonzero cancellation for
maxcontfillin	maximal fill-in allowed for continuous variables
maxintfillin	maximal fill-in allowed for integral variables
maxbinfillin	maximal fill-in allowed for binary variables
maxconsiderednonzeros	maximal number of nonzeros to consider for cancellation
preserveintcoefs	only perform nonzero cancellation if integrality of coefficients is preserved?
nuseless	pointer to update number of useless hashtable retrieves
nchgcoefs	pointer to update number of changed coefficients
ncanceled	pointer to update number of canceled nonzeros
nfillin	pointer to update the produced fill-in
isaddedcons	whether a linear constraint required to added to keep the validity

Definition at line 705 of file presol_dualsparsify.c.

References a, aggregation(), b, ColConsPair::colindex, ColConsPair::conscoef1, ColConsPair::conscoef2, ColConsPair::consindex1, ColConsPair::consindex2, COPYSIGN, FALSE, getImpliedBounds(), MAX, MAXSCALE, MIN, NULL, REALABS, SCIP_Bool, SCIP_CALL, SCIP_OKAY, SCIP_Real, SCIPallocBufferArray, SCIPdebugMsg, SCIPduplicateBufferArray, SCIPfreeBufferArray, SCIPhashtableRetrieve(), SCIPisInfinity(), SCIPisIntegral(), SCIPisVarAggrCoefAcceptable(), SCIPisZero(), SCIPmatrixGetColIdxPtr(), SCIPmatrixGetColNDownlocks(), SCIPmatrixGetColNNonzs(), SCIPmatrixGetColNUplocks(), SCIPmatrixGetColValPtr(), SCIPmatrixGetNColumns(), SCIPmatrixGetRowLhs(), SCIPmatrixGetRowNNonzs(), SCIPmatrixGetRowRhs(), SCIPsortRealInt(), SCIPswapPointers(), SCIPvarGetName(), SCIPvarIsBinary(), SCIPvarIsImpliedIntegral(), SCIPvarIsIntegral(), and TRUE.

Referenced by SCIP_DECL_PRESOLEXEC().

◆ updateFailureStatistic()

static void updateFailureStatistic	(	SCIP_PRESOLDATA *	presoldata,
		SCIP_Bool	success
	)

static

updates failure counter after one execution

Parameters

presoldata	presolver data
success	was this execution successful?

Definition at line 1199 of file presol_dualsparsify.c.

References NULL, and SCIP_Real.

Referenced by SCIP_DECL_PRESOLEXEC().

◆ SCIP_DECL_PRESOLCOPY()

static SCIP_DECL_PRESOLCOPY ( presolCopyDualsparsify )

static

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

Definition at line 1224 of file presol_dualsparsify.c.

References NULL, PRESOL_NAME, SCIP_CALL, SCIP_OKAY, SCIPincludePresolDualsparsify(), SCIPpresolGetData(), and SCIPpresolGetName().

◆ SCIP_DECL_PRESOLEXEC()

static SCIP_DECL_PRESOLEXEC ( presolExecDualsparsify )

static

execution method of presolver

Definition at line 1246 of file presol_dualsparsify.c.

References cancelCol(), ColConsPair::colindex, ColConsPair::conscoef1, ColConsPair::conscoef2, ColConsPair::consindex1, ColConsPair::consindex2, FALSE, getImpliedBounds(), MIN, NULL, SCIP_Bool, SCIP_CALL, SCIP_CUTOFF, SCIP_DIDNOTFIND, SCIP_DIDNOTRUN, SCIP_Longint, SCIP_OKAY, SCIP_Real, SCIP_SUCCESS, SCIP_VERBLEVEL_HIGH, SCIPallocBufferArray, SCIPblkmem(), SCIPcalcMemGrowSize(), SCIPdebugMsg, SCIPdoNotAggr(), SCIPdoNotMultaggrVar(), SCIPfreeBufferArray, SCIPfreeBufferArrayNull, SCIPgetNRuns(), SCIPgetSolvingTime(), SCIPhashtableCreate(), SCIPhashtableFree(), SCIPhashtableInsert(), SCIPhashtableRemove(), SCIPhashtableRemoveAll(), SCIPhashtableRetrieve(), SCIPisStopped(), SCIPmatrixCreate(), SCIPmatrixDownlockConflict(), SCIPmatrixFree(), SCIPmatrixGetColIdxPtr(), SCIPmatrixGetColNNonzs(), SCIPmatrixGetColValPtr(), SCIPmatrixGetNColumns(), SCIPmatrixGetNRows(), SCIPmatrixGetRowNNonzs(), SCIPmatrixGetVar(), SCIPmatrixUplockConflict(), SCIPpresolGetData(), SCIPreallocBufferArray, SCIPsortIntInt(), SCIPsortIntReal(), SCIPsortRealInt(), SCIPverbMessage(), TRUE, and updateFailureStatistic().

◆ SCIP_DECL_PRESOLFREE()

static SCIP_DECL_PRESOLFREE ( presolFreeDualsparsify )

static

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

Definition at line 1741 of file presol_dualsparsify.c.

References NULL, SCIP_OKAY, SCIPfreeBlockMemory, SCIPpresolGetData(), and SCIPpresolSetData().

◆ SCIP_DECL_PRESOLINIT()

static SCIP_DECL_PRESOLINIT ( presolInitDualsparsify )

static

initialization method of presolver (called after problem was transformed)

Definition at line 1757 of file presol_dualsparsify.c.

References SCIP_OKAY, and SCIPpresolGetData().

◆ SCIPincludePresolDualsparsify()

SCIP_RETCODE SCIPincludePresolDualsparsify ( SCIP * scip )

creates the dualsparsify presolver and includes it in SCIP

Parameters

scip	SCIP data structure

Definition at line 1771 of file presol_dualsparsify.c.

References DEFAULT_ENABLECOPY, DEFAULT_MAX_BIN_FILLIN, DEFAULT_MAX_CONT_FILLIN, DEFAULT_MAX_INT_FILLIN, DEFAULT_MAXCONSIDEREDNONZEROS, DEFAULT_MAXRETRIEVEFAC, DEFAULT_MINELIMINATEDNONZEROS, DEFAULT_PRESERVEGOODLOCKS, DEFAULT_PRESERVEINTCOEFS, DEFAULT_WAITINGFAC, FALSE, NULL, PRESOL_DESC, PRESOL_MAXROUNDS, PRESOL_NAME, PRESOL_PRIORITY, PRESOL_TIMING, SCIP_CALL, SCIP_OKAY, SCIP_REAL_MAX, SCIPaddBoolParam(), SCIPaddIntParam(), SCIPaddRealParam(), SCIPallocBlockMemory, SCIPincludePresolBasic(), SCIPsetPresolCopy(), SCIPsetPresolFree(), SCIPsetPresolInit(), and TRUE.

Referenced by SCIP_DECL_PRESOLCOPY(), and SCIPincludeDefaultPlugins().

SCIP

Detailed Description

Data Structures

Macros

Typedefs

Functions

Macro Definition Documentation

◆ PRESOL_NAME

◆ PRESOL_DESC

◆ PRESOL_PRIORITY

◆ PRESOL_MAXROUNDS

◆ PRESOL_TIMING

◆ DEFAULT_ENABLECOPY

◆ DEFAULT_PRESERVEINTCOEFS

◆ DEFAULT_PRESERVEGOODLOCKS

◆ DEFAULT_MAX_CONT_FILLIN

◆ DEFAULT_MAX_BIN_FILLIN

◆ DEFAULT_MAX_INT_FILLIN

◆ DEFAULT_MAXCONSIDEREDNONZEROS

◆ DEFAULT_MINELIMINATEDNONZEROS

◆ DEFAULT_MAXRETRIEVEFAC

◆ DEFAULT_WAITINGFAC

◆ MAXSCALE

Typedef Documentation

◆ COLCONSPAIR

Function Documentation

◆ SCIP_DECL_HASHKEYEQ()

◆ SCIP_DECL_HASHKEYVAL()

◆ getMaxActivitySingleRowWithoutCol()

◆ getMinActivitySingleRowWithoutCol()

◆ getMinMaxActivityResiduals()

◆ getVarBoundsOfRow()

◆ getImpliedBounds()

◆ aggregation()

◆ cancelCol()

◆ updateFailureStatistic()

◆ SCIP_DECL_PRESOLCOPY()

◆ SCIP_DECL_PRESOLEXEC()

◆ SCIP_DECL_PRESOLFREE()

◆ SCIP_DECL_PRESOLINIT()

◆ SCIPincludePresolDualsparsify()