Detailed Description

constraint handler for conjunction constraints

Author: Tobias Achterberg

A conjunction constraint $ C $ is a constraint of the form

$C = C_1 \wedge \dots \wedge C_n$

where all the $ C_i $ are individual constraints themselves.

#include "scip/scip.h"

Functions
SCIP_RETCODE	SCIPincludeConshdlrConjunction (SCIP *scip)

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

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

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

Function Documentation

SCIP_RETCODE SCIPincludeConshdlrConjunction ( SCIP * scip )

creates the handler for conjunction constraints and includes it in SCIP

Parameters

scip	SCIP data structure

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

creates and captures a conjunction 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 conjunction
conss	initial constraint in conjunction
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.

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

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

See also: SCIPcreateConsConjunction() 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 conjunction
conss	initial constraint in conjunction

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

adds constraint to the conjunction of constraints

Parameters

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

SCIP

Detailed Description

Functions

Function Documentation