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Detailed Description

fix singleton continuous variables

Author
Dieter Weninger

Investigate singleton continuous variables if one can be fixed at a bound.

Definition in file presol_stuffing.c.

#include "blockmemshell/memory.h"
#include "scip/presol_stuffing.h"
#include "scip/pub_matrix.h"
#include "scip/pub_message.h"
#include "scip/pub_misc_sort.h"
#include "scip/pub_presol.h"
#include "scip/pub_var.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_presol.h"
#include "scip/scip_pricer.h"
#include "scip/scip_prob.h"
#include "scip/scip_probing.h"
#include "scip/scip_var.h"
#include <string.h>

Go to the source code of this file.

Macros

#define PRESOL_NAME   "stuffing"
#define PRESOL_DESC   "fix redundant singleton continuous variables"
#define PRESOL_PRIORITY   -100
#define PRESOL_MAXROUNDS   0
#define PRESOL_TIMING   SCIP_PRESOLTIMING_EXHAUSTIVE /* timing of the presolver (fast, medium, or exhaustive) */

Functions

static SCIP_RETCODE singletonColumnStuffing (SCIP *scip, SCIP_MATRIX *matrix, FIXINGDIRECTION *varstofix, int *nfixings)
static SCIP_DECL_PRESOLCOPY (presolCopyStuffing)
static SCIP_DECL_PRESOLEXEC (presolExecStuffing)
SCIP_RETCODE SCIPincludePresolStuffing (SCIP *scip)

Macro Definition Documentation

◆ PRESOL_NAME

#define PRESOL_NAME   "stuffing"

Definition at line 57 of file presol_stuffing.c.

◆ PRESOL_DESC

#define PRESOL_DESC   "fix redundant singleton continuous variables"

Definition at line 58 of file presol_stuffing.c.

◆ PRESOL_PRIORITY

#define PRESOL_PRIORITY   -100

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

Definition at line 59 of file presol_stuffing.c.

◆ PRESOL_MAXROUNDS

#define PRESOL_MAXROUNDS   0

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

Definition at line 60 of file presol_stuffing.c.

◆ PRESOL_TIMING

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

Definition at line 61 of file presol_stuffing.c.

Enumeration Type Documentation

◆ Fixingdirection

type of fixing direction

Enumerator
FIXATLB 

fix variable at lower bound

NOFIX 

do not fix variable

FIXATUB 

fix variable at upper bound

Definition at line 64 of file presol_stuffing.c.

Function Documentation

◆ singletonColumnStuffing()

◆ SCIP_DECL_PRESOLCOPY()

SCIP_DECL_PRESOLCOPY ( presolCopyStuffing )
static

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

Definition at line 346 of file presol_stuffing.c.

References assert(), NULL, PRESOL_NAME, SCIP_CALL, SCIP_OKAY, SCIPincludePresolStuffing(), and SCIPpresolGetName().

◆ SCIP_DECL_PRESOLEXEC()