heur_bound.c File Reference

Detailed Description

heuristic which fixes all integer variables to a bound (lower/upper) and solves the remaining LP

Author

Gerald Gamrath

Definition in file heur_bound.c.

#include <assert.h>
#include <string.h>
#include "scip/scip.h"
#include "scip/heur_bound.h"

Go to the source code of this file.

Macros
#define	HEUR_NAME   "bound"
#define	HEUR_DESC   "heuristic which fixes all integer variables to a bound and solves the remaining LP"
#define	HEUR_DISPCHAR   'H'
#define	HEUR_PRIORITY   -1107000
#define	HEUR_FREQ   -1
#define	HEUR_FREQOFS   0
#define	HEUR_MAXDEPTH   -1
#define	HEUR_TIMING   SCIP_HEURTIMING_BEFORENODE
#define	HEUR_USESSUBSCIP   FALSE
#define	DEFAULT_ONLYWITHOUTSOL   TRUE
#define	DEFAULT_MAXPROPROUNDS   0 /* maximum number of propagation rounds during probing */
#define	DEFAULT_BOUND   'l'

Functions
static SCIP_RETCODE	applyBoundHeur (SCIP *scip, SCIP_HEUR *heur, SCIP_HEURDATA *heurdata, SCIP_Bool lower, SCIP_RESULT *result)
static	SCIP_DECL_HEURCOPY (heurCopyBound)
static	SCIP_DECL_HEURFREE (heurFreeBound)
static	SCIP_DECL_HEUREXEC (heurExecBound)
SCIP_RETCODE	SCIPincludeHeurBound (SCIP *scip)

Macro Definition Documentation

HEUR_NAME

#define HEUR_NAME   "bound"

Definition at line 34 of file heur_bound.c.

Referenced by SCIP_DECL_HEURCOPY(), and SCIPincludeHeurBound().

HEUR_DESC

#define HEUR_DESC   "heuristic which fixes all integer variables to a bound and solves the remaining LP"

Definition at line 35 of file heur_bound.c.

Referenced by SCIPincludeHeurBound().

HEUR_DISPCHAR

#define HEUR_DISPCHAR   'H'

Definition at line 36 of file heur_bound.c.

Referenced by SCIPincludeHeurBound().

HEUR_PRIORITY

#define HEUR_PRIORITY   -1107000

Definition at line 37 of file heur_bound.c.

Referenced by SCIPincludeHeurBound().

HEUR_FREQ

#define HEUR_FREQ   -1

Definition at line 38 of file heur_bound.c.

Referenced by SCIPincludeHeurBound().

HEUR_FREQOFS

#define HEUR_FREQOFS   0

Definition at line 39 of file heur_bound.c.

Referenced by SCIPincludeHeurBound().

HEUR_MAXDEPTH

#define HEUR_MAXDEPTH   -1

Definition at line 40 of file heur_bound.c.

Referenced by SCIPincludeHeurBound().

HEUR_TIMING

#define HEUR_TIMING   SCIP_HEURTIMING_BEFORENODE

Definition at line 41 of file heur_bound.c.

Referenced by SCIPincludeHeurBound().

HEUR_USESSUBSCIP

#define HEUR_USESSUBSCIP   FALSE

does the heuristic use a secondary SCIP instance?

Definition at line 42 of file heur_bound.c.

Referenced by SCIPincludeHeurBound().

DEFAULT_ONLYWITHOUTSOL

#define DEFAULT_ONLYWITHOUTSOL   TRUE

Should heuristic only be executed if no primal solution was found, yet?

Definition at line 44 of file heur_bound.c.

Referenced by SCIPincludeHeurBound().

DEFAULT_MAXPROPROUNDS

#define DEFAULT_MAXPROPROUNDS   0 /* maximum number of propagation rounds during probing */

Definition at line 45 of file heur_bound.c.

Referenced by SCIPincludeHeurBound().

DEFAULT_BOUND

#define DEFAULT_BOUND   'l'

to which bound should integer variables be fixed?

Definition at line 46 of file heur_bound.c.

Referenced by SCIPincludeHeurBound().

Function Documentation

applyBoundHeur()

static SCIP_RETCODE applyBoundHeur ( SCIP *  scip, SCIP_HEUR *  heur, SCIP_HEURDATA *  heurdata, SCIP_Bool  lower, SCIP_RESULT *  result  )

static

main procedure of the bound heuristic

Parameters

scip	original SCIP data structure
heur	heuristic
heurdata	heuristic data structure
lower	should integer variables be fixed to their lower bound?
result	pointer to store the result

Definition at line 67 of file heur_bound.c.

References FALSE, SCIP_Bool, SCIP_CALL, SCIP_FOUNDSOL, SCIP_LPSOLSTAT_OPTIMAL, SCIP_OKAY, SCIP_VARTYPE_IMPLINT, SCIPbacktrackProbing(), SCIPcreateSol(), SCIPdebugMsg, SCIPendProbing(), SCIPfixVarProbing(), SCIPfreeSol(), SCIPgetLPSolstat(), SCIPgetNLPIterations(), SCIPgetNPseudoBranchCands(), SCIPgetProbingDepth(), SCIPgetSolOrigObj(), SCIPgetSolvingTime(), SCIPgetVarsData(), SCIPisInfinity(), SCIPlinkLPSol(), SCIPpropagateProbing(), SCIProundSol(), SCIPsolveProbingLP(), SCIPstartProbing(), SCIPtrySol(), SCIPvarGetLbLocal(), SCIPvarGetName(), SCIPvarGetType(), SCIPvarGetUbLocal(), SCIPwarningMessage(), and TRUE.

Referenced by SCIP_DECL_HEUREXEC().

SCIP_DECL_HEURCOPY()

static SCIP_DECL_HEURCOPY ( heurCopyBound  )

static

copy method for primal heuristic plugins (called when SCIP copies plugins)

Definition at line 259 of file heur_bound.c.

References HEUR_NAME, SCIP_CALL, SCIP_OKAY, SCIPheurGetName(), and SCIPincludeHeurBound().

SCIP_DECL_HEURFREE()

static SCIP_DECL_HEURFREE ( heurFreeBound  )

static

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

Definition at line 273 of file heur_bound.c.

References SCIP_OKAY, SCIPfreeBlockMemory, SCIPheurGetData(), and SCIPheurSetData().

SCIP_DECL_HEUREXEC()

static SCIP_DECL_HEUREXEC ( heurExecBound  )

static

execution method of primal heuristic

Definition at line 288 of file heur_bound.c.

References applyBoundHeur(), FALSE, SCIP_Bool, SCIP_CALL, SCIP_DIDNOTFIND, SCIP_DIDNOTRUN, SCIP_OKAY, SCIPconstructLP(), SCIPcutoffNode(), SCIPdebugMsg, SCIPflushLP(), SCIPgetBestSol(), SCIPgetCurrentNode(), SCIPgetNPseudoBranchCands(), SCIPhasCurrentNodeLP(), SCIPheurGetData(), SCIPisLPConstructed(), SCIPisStopped(), SCIPnodeGetNumber(), and TRUE.