cons_disjunction.c File Reference

Detailed Description

constraint handler for disjunction constraints

Author

Stefan Heinz

Michael Winkler

Definition in file cons_disjunction.c.

#include <assert.h>
#include <string.h>
#include <limits.h>
#include "scip/cons_disjunction.h"

Go to the source code of this file.

Macros
#define	CONSHDLR_NAME   "disjunction"
#define	CONSHDLR_DESC   "disjunction of constraints (or(cons1, cons2, ..., consn))"
#define	CONSHDLR_ENFOPRIORITY   -950000
#define	CONSHDLR_CHECKPRIORITY   -900000
#define	CONSHDLR_PROPFREQ   -1
#define	CONSHDLR_EAGERFREQ   100
#define	CONSHDLR_MAXPREROUNDS   -1
#define	CONSHDLR_DELAYPROP   FALSE
#define	CONSHDLR_NEEDSCONS   TRUE
#define	CONSHDLR_PRESOLTIMING   SCIP_PRESOLTIMING_FAST
#define	CONSHDLR_PROP_TIMING   SCIP_PROPTIMING_BEFORELP
#define	DEFAULT_ALWAYSBRANCH   TRUE

Functions
static SCIP_RETCODE	consdataCreate (SCIP *scip, SCIP_CONSDATA **consdata, SCIP_CONS **conss, int nconss, SCIP_CONS *relaxcons)
static SCIP_RETCODE	consdataFree (SCIP *scip, SCIP_CONSDATA **consdata)
static SCIP_RETCODE	consdataAddCons (SCIP *scip, SCIP_CONSDATA *consdata, SCIP_CONS *cons)
static SCIP_RETCODE	branchCons (SCIP *scip, SCIP_CONS *cons, SCIP_RESULT *result)
static SCIP_RETCODE	checkCons (SCIP *scip, SCIP_CONS *cons, SCIP_SOL *sol, SCIP_Bool checkintegrality, SCIP_Bool checklprows, SCIP_Bool printreason, SCIP_RESULT *result)
static SCIP_RETCODE	propagateCons (SCIP *scip, SCIP_CONS *cons, int *ndelconss)
static	SCIP_DECL_CONSHDLRCOPY (conshdlrCopyDisjunction)
static	SCIP_DECL_CONSFREE (consFreeDisjunction)
static	SCIP_DECL_CONSDELETE (consDeleteDisjunction)
static	SCIP_DECL_CONSTRANS (consTransDisjunction)
static	SCIP_DECL_CONSINITLP (consInitlpDisjunction)
static	SCIP_DECL_CONSENFOLP (consEnfolpDisjunction)
static	SCIP_DECL_CONSENFOPS (consEnfopsDisjunction)
static	SCIP_DECL_CONSCHECK (consCheckDisjunction)
static	SCIP_DECL_CONSPROP (consPropDisjunction)
static	SCIP_DECL_CONSPRESOL (consPresolDisjunction)
static	SCIP_DECL_CONSLOCK (consLockDisjunction)
static	SCIP_DECL_CONSPRINT (consPrintDisjunction)
static	SCIP_DECL_CONSPARSE (consParseDisjunction)
static	SCIP_DECL_CONSCOPY (consCopyDisjunction)
SCIP_RETCODE	SCIPincludeConshdlrDisjunction (SCIP *scip)
SCIP_RETCODE	SCIPcreateConsDisjunction (SCIP *scip, SCIP_CONS **cons, const char *name, int nconss, SCIP_CONS **conss, SCIP_CONS *relaxcons, SCIP_Bool initial, SCIP_Bool enforce, SCIP_Bool check, SCIP_Bool local, SCIP_Bool modifiable, SCIP_Bool dynamic)
SCIP_RETCODE	SCIPcreateConsBasicDisjunction (SCIP *scip, SCIP_CONS **cons, const char *name, int nconss, SCIP_CONS **conss, SCIP_CONS *relaxcons)
SCIP_RETCODE	SCIPaddConsElemDisjunction (SCIP *scip, SCIP_CONS *cons, SCIP_CONS *addcons)

Macro Definition Documentation

#define CONSHDLR_NAME   "disjunction"

Definition at line 32 of file cons_disjunction.c.

Referenced by SCIPaddConsElemDisjunction(), SCIPcreateConsDisjunction(), and SCIPincludeConshdlrDisjunction().

#define CONSHDLR_DESC   "disjunction of constraints (or(cons1, cons2, ..., consn))"

Definition at line 33 of file cons_disjunction.c.

Referenced by SCIPincludeConshdlrDisjunction().

#define CONSHDLR_ENFOPRIORITY   -950000

priority of the constraint handler for constraint enforcing

Definition at line 34 of file cons_disjunction.c.

Referenced by SCIPincludeConshdlrDisjunction().

#define CONSHDLR_CHECKPRIORITY   -900000

priority of the constraint handler for checking feasibility

Definition at line 35 of file cons_disjunction.c.

Referenced by SCIPincludeConshdlrDisjunction().

#define CONSHDLR_PROPFREQ   -1

frequency for propagating domains; zero means only preprocessing propagation

Definition at line 36 of file cons_disjunction.c.

Referenced by SCIPincludeConshdlrDisjunction().

#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 37 of file cons_disjunction.c.

Referenced by SCIPincludeConshdlrDisjunction().

#define CONSHDLR_MAXPREROUNDS   -1

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

Definition at line 40 of file cons_disjunction.c.

Referenced by SCIPincludeConshdlrDisjunction().

#define CONSHDLR_DELAYPROP   FALSE

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

Definition at line 43 of file cons_disjunction.c.

Referenced by SCIPincludeConshdlrDisjunction().

#define CONSHDLR_NEEDSCONS   TRUE

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

Definition at line 44 of file cons_disjunction.c.

Referenced by SCIPincludeConshdlrDisjunction().

#define CONSHDLR_PRESOLTIMING   SCIP_PRESOLTIMING_FAST

Definition at line 46 of file cons_disjunction.c.

Referenced by SCIPincludeConshdlrDisjunction().

#define CONSHDLR_PROP_TIMING   SCIP_PROPTIMING_BEFORELP

Definition at line 47 of file cons_disjunction.c.

Referenced by SCIPincludeConshdlrDisjunction().

#define DEFAULT_ALWAYSBRANCH   TRUE

alawys perform branching if one of the constraints is violated, otherwise only if all integers are fixed

Definition at line 50 of file cons_disjunction.c.

Referenced by SCIPincludeConshdlrDisjunction().

Function Documentation

static SCIP_RETCODE consdataCreate ( SCIP *  scip, SCIP_CONSDATA **  consdata, SCIP_CONS **  conss, int  nconss, SCIP_CONS *  relaxcons  )

static

creates disjunction constraint data, captures initial constraints of disjunction

Parameters

scip	SCIP data structure
consdata	pointer to constraint data
conss	initial constraint in disjunction
nconss	number of initial constraints in disjunction
relaxcons	a conjuction constraint containing the liner relaxation of the disjunction constraint, or NULL

Definition at line 79 of file cons_disjunction.c.

References consdataFree(), NULL, SCIP_CALL, SCIP_OKAY, SCIPallocBlockMemory, SCIPcaptureCons(), SCIPduplicateBlockMemoryArray, SCIPisTransformed(), SCIPtransformCons(), and SCIPtransformConss().

Referenced by SCIPcreateConsDisjunction().

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

static

frees constraint data and releases all constraints in disjunction

Parameters

scip	SCIP data structure
consdata	pointer to constraint data

Definition at line 142 of file cons_disjunction.c.

References consdataAddCons(), NULL, SCIP_CALL, SCIP_OKAY, SCIPfreeBlockMemory, SCIPfreeBlockMemoryArrayNull, and SCIPreleaseCons().

Referenced by consdataCreate().

static SCIP_RETCODE consdataAddCons ( SCIP *  scip, SCIP_CONSDATA *  consdata, SCIP_CONS *  cons  )

static

adds constraint to disjunction

Parameters

scip	SCIP data structure
consdata	constraint data
cons	constraint to add to the disjunction

Definition at line 174 of file cons_disjunction.c.

References branchCons(), NULL, SCIP_CALL, SCIP_OKAY, SCIPcaptureCons(), SCIPensureBlockMemoryArray, SCIPisTransformed(), and SCIPtransformCons().

Referenced by consdataFree(), and SCIPaddConsElemDisjunction().

static SCIP_RETCODE branchCons ( SCIP *  scip, SCIP_CONS *  cons, SCIP_RESULT *  result  )

static

branches on disjunctive constraint

Parameters

scip	SCIP data structure
cons	active disjunction constraint
result	pointer to store the result

Definition at line 208 of file cons_disjunction.c.

References checkCons(), NULL, SCIP_BRANCHED, SCIP_CALL, SCIP_OKAY, SCIP_Real, SCIPaddConsNode(), SCIPconsGetData(), SCIPconsGetName(), SCIPconsIsChecked(), SCIPconsIsModifiable(), SCIPcreateChild(), SCIPdebugMessage, SCIPdelConsNode(), SCIPgetLocalTransEstimate(), SCIPresetConsAge(), SCIPsetConsChecked(), and TRUE.

Referenced by consdataAddCons(), enforceConssSOS1(), enforceIndicators(), and enforceSOS2().

static SCIP_RETCODE checkCons ( SCIP *  scip, SCIP_CONS *  cons, SCIP_SOL *  sol, SCIP_Bool  checkintegrality, SCIP_Bool  checklprows, SCIP_Bool  printreason, SCIP_RESULT *  result  )

static

checks disjunction constraints if at least one is feasible

Parameters

scip	SCIP data structure
cons	active disjunction constraint
sol	solution to check
checkintegrality	Has integrality to be checked?
checklprows	Do constraints represented by rows in the current LP have to be checked?
printreason	Should the reason for the violation be printed?
result	pointer to store the result

Definition at line 269 of file cons_disjunction.c.

References FALSE, NULL, propagateCons(), SCIP_CALL, SCIP_FEASIBLE, SCIP_INFEASIBLE, SCIP_OKAY, SCIPcheckCons(), SCIPconsGetData(), SCIPconsGetName(), SCIPdebug, SCIPinfoMessage(), and SCIPprintCons().

Referenced by branchCons(), and SCIP_DECL_CONSCHECK().

static SCIP_RETCODE propagateCons ( SCIP *  scip, SCIP_CONS *  cons, int *  ndelconss  )

static

propagation method for disjunction constraint

Parameters

scip	SCIP data structure
cons	disjunctive constraint
ndelconss	pointer to count number of deleted constraints

Definition at line 315 of file cons_disjunction.c.

References NULL, SCIP_CALL, SCIP_DECL_CONSHDLRCOPY(), SCIP_OKAY, SCIP_STAGE_PRESOLVING, SCIPconsGetData(), SCIPconsIsActive(), SCIPconsIsChecked(), SCIPconsIsDeleted(), SCIPdelCons(), SCIPdelConsLocal(), SCIPgetNNodes(), SCIPgetStage(), SCIPsetConsChecked(), and TRUE.

Referenced by checkCons(), and SCIP_DECL_CONSPROP().

static SCIP_DECL_CONSHDLRCOPY ( conshdlrCopyDisjunction  )

static

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

Definition at line 382 of file cons_disjunction.c.

Referenced by propagateCons().

static SCIP_DECL_CONSFREE ( consFreeDisjunction  )

static

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

Definition at line 398 of file cons_disjunction.c.

static SCIP_DECL_CONSDELETE ( consDeleteDisjunction  )

static

frees specific constraint data

Definition at line 419 of file cons_disjunction.c.

static SCIP_DECL_CONSTRANS ( consTransDisjunction  )

static

transforms constraint data into data belonging to the transformed problem

Definition at line 429 of file cons_disjunction.c.

static SCIP_DECL_CONSINITLP ( consInitlpDisjunction  )

static

LP initialization method of constraint handler

Definition at line 452 of file cons_disjunction.c.

References NULL, SCIP_CALL, SCIP_DECL_CONSENFOLP(), SCIP_OKAY, SCIPaddConsLocal(), SCIPconsGetData(), and SCIPconsIsActive().

static SCIP_DECL_CONSENFOLP ( consEnfolpDisjunction  )

static

constraint enforcing method of constraint handler for LP solutions

Definition at line 475 of file cons_disjunction.c.

Referenced by SCIP_DECL_CONSINITLP().

static SCIP_DECL_CONSENFOPS ( consEnfopsDisjunction  )

static

constraint enforcing method of constraint handler for pseudo solutions

Definition at line 505 of file cons_disjunction.c.

static SCIP_DECL_CONSCHECK ( consCheckDisjunction  )

static

feasibility check method of constraint handler for integral solutions

Definition at line 535 of file cons_disjunction.c.

References checkCons(), SCIP_CALL, SCIP_DECL_CONSPROP(), SCIP_FEASIBLE, SCIP_INFEASIBLE, and SCIP_OKAY.

static SCIP_DECL_CONSPROP ( consPropDisjunction  )

static

domain propagation method of constraint handler

Definition at line 554 of file cons_disjunction.c.

References propagateCons(), SCIP_CALL, SCIP_DECL_CONSPRESOL(), SCIP_DIDNOTFIND, SCIP_OKAY, and SCIP_REDUCEDDOM.

Referenced by SCIP_DECL_CONSCHECK().

static SCIP_DECL_CONSPRESOL ( consPresolDisjunction  )

static

presolving method of constraint handler

Definition at line 583 of file cons_disjunction.c.

Referenced by SCIP_DECL_CONSPROP().

static SCIP_DECL_CONSLOCK ( consLockDisjunction  )

static

variable rounding lock method of constraint handler

Definition at line 637 of file cons_disjunction.c.

static SCIP_DECL_CONSPRINT ( consPrintDisjunction  )

static

constraint display method of constraint handler

Definition at line 657 of file cons_disjunction.c.

static SCIP_DECL_CONSPARSE ( consParseDisjunction  )

static

constraint parsing method of constraint handler

Definition at line 692 of file cons_disjunction.c.

static SCIP_DECL_CONSCOPY ( consCopyDisjunction  )

static

constraint copying method of constraint handler

Definition at line 900 of file cons_disjunction.c.

SCIP_RETCODE SCIPincludeConshdlrDisjunction

(

SCIP *

scip

)

creates the handler for disjunction constraints and includes it in SCIP

Parameters

scip	SCIP data structure

Definition at line 989 of file cons_disjunction.c.

References CONSHDLR_CHECKPRIORITY, CONSHDLR_DELAYPROP, CONSHDLR_DESC, CONSHDLR_EAGERFREQ, CONSHDLR_ENFOPRIORITY, CONSHDLR_MAXPREROUNDS, CONSHDLR_NAME, CONSHDLR_NEEDSCONS, CONSHDLR_PRESOLTIMING, CONSHDLR_PROP_TIMING, CONSHDLR_PROPFREQ, DEFAULT_ALWAYSBRANCH, FALSE, NULL, SCIP_CALL, SCIP_OKAY, SCIPaddBoolParam(), SCIPallocMemory, SCIPcreateConsDisjunction(), SCIPincludeConshdlrBasic(), SCIPsetConshdlrCopy(), SCIPsetConshdlrDelete(), SCIPsetConshdlrFree(), SCIPsetConshdlrInitlp(), SCIPsetConshdlrParse(), SCIPsetConshdlrPresol(), SCIPsetConshdlrPrint(), SCIPsetConshdlrProp(), and SCIPsetConshdlrTrans().

Referenced by SCIPincludeDefaultPlugins().

SCIP_RETCODE SCIPcreateConsDisjunction	(	SCIP *	scip,
		SCIP_CONS **	cons,
		const char *	name,
		int	nconss,
		SCIP_CONS **	conss,
		SCIP_CONS *	relaxcons,
		SCIP_Bool	initial,
		SCIP_Bool	enforce,
		SCIP_Bool	check,
		SCIP_Bool	local,
		SCIP_Bool	modifiable,
		SCIP_Bool	dynamic
	)

creates and captures a disjunction 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
nconss	number of initial constraints in disjunction
conss	initial constraint in disjunction
relaxcons	a conjunction constraint containing the linear relaxation of the disjunction constraint, or NULL
initial	should the LP relaxation of constraint be in the initial LP? Usually set to TRUE. Set to FALSE for 'lazy constraints'.
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.
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.

Definition at line 1033 of file cons_disjunction.c.

References consdataCreate(), CONSHDLR_NAME, FALSE, NULL, SCIP_CALL, SCIP_OKAY, SCIP_PLUGINNOTFOUND, SCIPcreateCons(), SCIPcreateConsBasicDisjunction(), SCIPerrorMessage, and SCIPfindConshdlr().

Referenced by SCIPcreateConsBasicDisjunction(), and SCIPincludeConshdlrDisjunction().

SCIP_RETCODE SCIPcreateConsBasicDisjunction	(	SCIP *	scip,
		SCIP_CONS **	cons,
		const char *	name,
		int	nconss,
		SCIP_CONS **	conss,
		SCIP_CONS *	relaxcons
	)

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

See also

SCIPcreateConsDisjunction() 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
nconss	number of initial constraints in disjunction
conss	initial constraint in disjunction
relaxcons	a conjunction constraint containing the linear relaxation of the disjunction constraint, or NULL

Definition at line 1085 of file cons_disjunction.c.

References FALSE, NULL, SCIP_CALL, SCIP_OKAY, SCIPaddConsElemDisjunction(), SCIPcreateConsDisjunction(), and TRUE.

Referenced by SCIPcreateConsDisjunction().

SCIP_RETCODE SCIPaddConsElemDisjunction	(	SCIP *	scip,
		SCIP_CONS *	cons,
		SCIP_CONS *	addcons
	)

adds constraint to the disjunction of constraints

Parameters

scip	SCIP data structure
cons	disjunction constraint
addcons	additional constraint in disjunction

Definition at line 1104 of file cons_disjunction.c.

References consdataAddCons(), CONSHDLR_NAME, NULL, SCIP_CALL, SCIP_INVALIDDATA, SCIP_OKAY, SCIPconsGetData(), SCIPconsGetHdlr(), SCIPconshdlrGetName(), and SCIPerrorMessage.

Referenced by SCIPcreateConsBasicDisjunction().