NLP Diving

Detailed Description

methods to initiate and conduct NLP Diving

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

Function Documentation

SCIPstartDiveNLP()

SCIP_RETCODE SCIPstartDiveNLP

(

SCIP *

scip

)

initiates NLP diving

Makes functions SCIPchgVarObjDiveNLP(), SCIPchgVarBoundsDiveNLP() and SCIPchgVarsBoundsDiveNLP() available. Further, SCIPsolveNLP() can be used to solve the 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 760 of file scip_nlp.c.

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

Referenced by getFixingValue().

SCIPendDiveNLP()

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 788 of file scip_nlp.c.

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

Referenced by SCIPapplyUndercover().

SCIPchgVarObjDiveNLP()

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 814 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_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 844 of file scip_nlp.c.

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

Referenced by getFixingValue().

SCIPchgVarsBoundsDiveNLP()

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 875 of file scip_nlp.c.

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