NLP Diving

Detailed Description

methods to initiate and conduct NLP Diving

Functions
SCIP_EXPORT SCIP_RETCODE	SCIPstartDiveNLP (SCIP *scip)
SCIP_EXPORT SCIP_RETCODE	SCIPendDiveNLP (SCIP *scip)
SCIP_EXPORT SCIP_RETCODE	SCIPchgVarObjDiveNLP (SCIP *scip, SCIP_VAR *var, SCIP_Real coef)
SCIP_EXPORT SCIP_RETCODE	SCIPchgVarBoundsDiveNLP (SCIP *scip, SCIP_VAR *var, SCIP_Real lb, SCIP_Real ub)
SCIP_EXPORT SCIP_RETCODE	SCIPchgVarsBoundsDiveNLP (SCIP *scip, int nvars, SCIP_VAR **vars, SCIP_Real *lbs, SCIP_Real *ubs)
SCIP_EXPORT SCIP_RETCODE	SCIPsolveDiveNLP (SCIP *scip)

Function Documentation

SCIPstartDiveNLP()

SCIP_EXPORT SCIP_RETCODE SCIPstartDiveNLP

(

SCIP *

scip

)

initiates NLP diving making methods SCIPchgVarObjDiveNLP(), SCIPchgVarBoundsDiveNLP(), SCIPchgVarsBoundsDiveNLP(), and SCIPsolveDiveNLP() available

Returns

SCIP_OKAY is returned if everything worked. Otherwise a suitable error code is passed. See SCIP_RETCODE for a complete list of error codes.

Precondition

This method can be called if SCIP is in one of the following stages:

• SCIP_STAGE_INITSOLVE
• SCIP_STAGE_SOLVING

Parameters

scip	SCIP data structure

Definition at line 988 of file scip_nlp.c.

References FALSE, Scip::nlp, NULL, SCIP_CALL, SCIP_INVALIDCALL, SCIP_OKAY, SCIPblkmem(), SCIPcheckStage(), SCIPerrorMessage, SCIPnlpStartDive(), Scip::set, and TRUE.

Referenced by getFixingValue().

SCIPendDiveNLP()

SCIP_EXPORT SCIP_RETCODE SCIPendDiveNLP

(

SCIP *

scip

)

ends NLP diving

Resets changes made by SCIPchgVarObjDiveNLP(), SCIPchgVarBoundsDiveNLP(), and SCIPchgVarsBoundsDiveNLP().

Returns

SCIP_OKAY is returned if everything worked. Otherwise a suitable error code is passed. See SCIP_RETCODE for a complete list of error codes.

Precondition

This method can be called if SCIP is in one of the following stages:

• SCIP_STAGE_INITSOLVE
• SCIP_STAGE_SOLVING

Parameters

scip	SCIP data structure

Definition at line 1016 of file scip_nlp.c.

References FALSE, Scip::nlp, NULL, SCIP_CALL, SCIP_INVALIDCALL, SCIP_OKAY, SCIPblkmem(), SCIPcheckStage(), SCIPerrorMessage, SCIPnlpEndDive(), Scip::set, and TRUE.

Referenced by SCIPapplyUndercover().

SCIPchgVarObjDiveNLP()

SCIP_EXPORT SCIP_RETCODE SCIPchgVarObjDiveNLP	(	SCIP *	scip,
		SCIP_VAR *	var,
		SCIP_Real	coef
	)

changes linear objective coefficient of a variable in diving NLP

Returns

SCIP_OKAY is returned if everything worked. Otherwise a suitable error code is passed. See SCIP_RETCODE for a complete list of error codes.

Precondition

This method can be called if SCIP is in one of the following stages:

• SCIP_STAGE_INITSOLVE
• SCIP_STAGE_SOLVING

Parameters

scip	SCIP data structure
var	variable which coefficient to change
coef	new value for coefficient

Definition at line 1042 of file scip_nlp.c.

References FALSE, Scip::nlp, NULL, SCIP_Var::scip, SCIP_CALL, SCIP_INVALIDCALL, SCIP_OKAY, SCIPblkmem(), SCIPcheckStage(), SCIPerrorMessage, SCIPnlpChgVarObjDive(), Scip::set, Scip::stat, and TRUE.

SCIPchgVarBoundsDiveNLP()

SCIP_EXPORT SCIP_RETCODE SCIPchgVarBoundsDiveNLP	(	SCIP *	scip,
		SCIP_VAR *	var,
		SCIP_Real	lb,
		SCIP_Real	ub
	)

changes bounds of a variable in diving NLP

Returns

SCIP_OKAY is returned if everything worked. Otherwise a suitable error code is passed. See SCIP_RETCODE for a complete list of error codes.

Precondition

This method can be called if SCIP is in one of the following stages:

• SCIP_STAGE_INITSOLVE
• SCIP_STAGE_SOLVING

Parameters

scip	SCIP data structure
var	variable which bounds to change
lb	new lower bound
ub	new upper bound

Definition at line 1072 of file scip_nlp.c.

References FALSE, Scip::nlp, NULL, SCIP_Var::scip, SCIP_CALL, SCIP_INVALIDCALL, SCIP_OKAY, SCIPcheckStage(), SCIPerrorMessage, SCIPnlpChgVarBoundsDive(), and TRUE.

Referenced by getFixingValue().

SCIPchgVarsBoundsDiveNLP()

SCIP_EXPORT SCIP_RETCODE SCIPchgVarsBoundsDiveNLP	(	SCIP *	scip,
		int	nvars,
		SCIP_VAR **	vars,
		SCIP_Real *	lbs,
		SCIP_Real *	ubs
	)

changes bounds of a set of variables in diving NLP

Returns

SCIP_OKAY is returned if everything worked. Otherwise a suitable error code is passed. See SCIP_RETCODE for a complete list of error codes.

Precondition

This method can be called if SCIP is in one of the following stages:

• SCIP_STAGE_INITSOLVE
• SCIP_STAGE_SOLVING

Parameters

scip	SCIP data structure
nvars	number of variables which bounds to changes
vars	variables which bounds to change
lbs	new lower bounds
ubs	new upper bounds

Definition at line 1103 of file scip_nlp.c.

References FALSE, Scip::nlp, NULL, SCIP_CALL, SCIP_INVALIDCALL, SCIP_OKAY, SCIPcheckStage(), SCIPerrorMessage, SCIPnlpChgVarsBoundsDive(), Scip::set, and TRUE.

SCIPsolveDiveNLP()

SCIP_EXPORT SCIP_RETCODE SCIPsolveDiveNLP

(

SCIP *

scip

)

solves diving NLP

Returns

SCIP_OKAY is returned if everything worked. Otherwise a suitable error code is passed. See SCIP_RETCODE for a complete list of error codes.

Precondition

This method can be called if SCIP is in one of the following stages:

• SCIP_STAGE_INITSOLVE
• SCIP_STAGE_SOLVING

Parameters

scip	SCIP data structure

Definition at line 1133 of file scip_nlp.c.

References FALSE, Scip::messagehdlr, Scip::nlp, NULL, SCIP_CALL, SCIP_INVALIDCALL, SCIP_OKAY, SCIPblkmem(), SCIPcheckStage(), SCIPerrorMessage, SCIPnlpSolveDive(), Scip::set, Scip::stat, and TRUE.

Referenced by getFixingValue().