Detailed Description

methods for the nonlinear relaxation

Modules
	Nonlinear Rows
	methods for the creation and interaction with rows of the NLP relaxation

	NLP Diving
	methods to initiate and conduct NLP Diving

Macros
#define	SCIPsolveNLP(...)

Functions
SCIP_Bool	SCIPisNLPEnabled (SCIP *scip)

void	SCIPenableNLP (SCIP *scip)

SCIP_Bool	SCIPisNLPConstructed (SCIP *scip)

SCIP_RETCODE	SCIPhasNLPContinuousNonlinearity (SCIP scip, SCIP_Bool result)

SCIP_RETCODE	SCIPgetNLPVarsData (SCIP scip, SCIP_VAR *vars, int nvars)

SCIP_VAR **	SCIPgetNLPVars (SCIP *scip)

int	SCIPgetNNLPVars (SCIP *scip)

SCIP_RETCODE	SCIPgetNLPVarsNonlinearity (SCIP scip, int nlcount)

SCIP_Real *	SCIPgetNLPVarsLbDualsol (SCIP *scip)

SCIP_Real *	SCIPgetNLPVarsUbDualsol (SCIP *scip)

SCIP_RETCODE	SCIPgetNLPNlRowsData (SCIP scip, SCIP_NLROW *nlrows, int nnlrows)

SCIP_NLROW **	SCIPgetNLPNlRows (SCIP *scip)

int	SCIPgetNNLPNlRows (SCIP *scip)

SCIP_RETCODE	SCIPgetNLPNlRowsStat (SCIP scip, int nlinear, int nconvexineq, int nnonconvexineq, int *nnonlineareq)

SCIP_RETCODE	SCIPaddNlRow (SCIP scip, SCIP_NLROW nlrow)

SCIP_RETCODE	SCIPdelNlRow (SCIP scip, SCIP_NLROW nlrow)

SCIP_RETCODE	SCIPflushNLP (SCIP *scip)

SCIP_RETCODE	SCIPsetNLPInitialGuess (SCIP scip, SCIP_Real initialguess)

SCIP_RETCODE	SCIPsetNLPInitialGuessSol (SCIP scip, SCIP_SOL sol)

SCIP_RETCODE	SCIPsolveNLPParam (SCIP *scip, SCIP_NLPPARAM param)

SCIP_NLPSOLSTAT	SCIPgetNLPSolstat (SCIP *scip)

SCIP_NLPTERMSTAT	SCIPgetNLPTermstat (SCIP *scip)

SCIP_RETCODE	SCIPgetNLPStatistics (SCIP scip, SCIP_NLPSTATISTICS statistics)

SCIP_Real	SCIPgetNLPObjval (SCIP *scip)

SCIP_Bool	SCIPhasNLPSolution (SCIP *scip)

SCIP_RETCODE	SCIPgetNLPFracVars (SCIP scip, SCIP_VAR fracvars, SCIP_Real fracvarssol, SCIP_Real *fracvarsfrac, int nfracvars, int *npriofracvars)

SCIP_RETCODE	SCIPwriteNLP (SCIP scip, const char filename)

SCIP_RETCODE	SCIPgetNLPI (SCIP scip, SCIP_NLPI nlpi, SCIP_NLPIPROBLEM *nlpiproblem)

Macro Definition Documentation

◆ SCIPsolveNLP

#define SCIPsolveNLP ( ... )

Value:

SCIPsolveNLPParam(SCIP_VARARGS_FIRST((__VA_ARGS__, ignored)), \

(SCIP_NLPPARAM){ SCIP_NLPPARAM_DEFAULT_INITS(SCIP_VARARGS_FIRST((__VA_ARGS__, ignored))), SCIP_VARARGS_REST(__VA_ARGS__, .caller = __FILE__) })

SCIP_VARARGS_FIRST

#define SCIP_VARARGS_FIRST(args)

Definition: def.h:81

SCIP_VARARGS_REST

#define SCIP_VARARGS_REST(firstarg,...)

Definition: def.h:84

SCIPsolveNLPParam

SCIP_RETCODE SCIPsolveNLPParam(SCIP *scip, SCIP_NLPPARAM param)

Definition: scip_nlp.c:545

SCIP_NlpParam

Definition: type_nlpi.h:67

SCIP_NLPPARAM_DEFAULT_INITS

#define SCIP_NLPPARAM_DEFAULT_INITS(scip)

Definition: type_nlpi.h:102

solves the current NLP (or diving NLP if in diving mode) with non-default parameters given as optional arguments

Typical use is

SCIP_CALL( SCIPsolveNLP(scip) );

to solve with default parameters. Additionally, one or several values of SCIP_NLPPARAM can be set:

SCIP_CALL( SCIPsolveNLP(scip, .iterlimit = 42, .verblevel = 1) );    //lint !e666

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:

Definition at line 361 of file scip_nlp.h.

Function Documentation

◆ SCIPisNLPEnabled()

SCIP_Bool SCIPisNLPEnabled ( SCIP * scip )

returns whether the NLP relaxation has been enabled

If the NLP relaxation is enabled, then SCIP will construct the NLP relaxation when the solving process is about to begin. To check whether an NLP is existing, use SCIPisNLPConstructed().

Precondition

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

See also: SCIPenableNLP

Parameters

scip	SCIP data structure

Definition at line 74 of file scip_nlp.c.

References FALSE, SCIP_CALL_ABORT, SCIPcheckStage, and TRUE.

Referenced by SCIP_DECL_PRESOLEXEC(), and setupAndSolve().

◆ SCIPenableNLP()

void SCIPenableNLP ( SCIP * scip )

notifies SCIP that the NLP relaxation should be initialized in INITSOLVE

This method is typically called by a constraint handler that handles constraints that have a nonlinear representation as nonlinear rows, e.g., cons_nonlinear.

The function should be called before the branch-and-bound process is initialized, e.g., when presolve is exiting.

Precondition

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

Parameters

scip	SCIP data structure

Definition at line 95 of file scip_nlp.c.

References FALSE, SCIP_CALL_ABORT, SCIPcheckStage, and TRUE.

Referenced by SCIP_DECL_CONSEXITPRE().

◆ SCIPisNLPConstructed()

SCIP_Bool SCIPisNLPConstructed ( SCIP * scip )

returns whether an NLP has been constructed

Precondition

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

Parameters

scip	SCIP data structure

Definition at line 110 of file scip_nlp.c.

References FALSE, NULL, SCIP_CALL_ABORT, SCIPcheckStage, and TRUE.

Referenced by addNlrow(), computeFixingrate(), computeStandardNLPFeasibilityCut(), computeStandardNLPOptimalityCut(), countNonlinearities(), createSubSCIP(), generateAndApplyBendersCuts(), getFixingValue(), getNlpSolution(), initBounds(), initSolve(), isRestartApplicable(), SCIP_DECL_BENDERSCUTEXEC(), SCIP_DECL_CONSACTIVE(), SCIP_DECL_CONSINITSOL(), SCIP_DECL_DIALOGEXEC(), SCIP_DECL_HEUREXEC(), SCIP_DECL_HEURINITSOL(), SCIP_DECL_PROPEXEC(), SCIP_DECL_RELAXEXEC(), SCIP_DECL_SEPAEXECLP(), SCIPapplyHeurDualval(), SCIPapplyUndercover(), SCIPbendersComputeSubproblemLowerbound(), SCIPbendersSolSlackVarsActive(), SCIPbendersSolveSubproblemLP(), SCIPcreateNLPSol(), SCIPgenerateAndApplyBendersOptCut(), SCIPupdateStartpointHeurSubNlp(), setSolutionValues(), solveLp(), and solveSubNLP().

◆ SCIPhasNLPContinuousNonlinearity()

SCIP_RETCODE SCIPhasNLPContinuousNonlinearity	(	SCIP *	scip,
		SCIP_Bool *	result
	)

checks whether the NLP has a continuous variable in a nonlinear term

Precondition

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

Parameters

scip	SCIP data structure
result	buffer to store result

Definition at line 125 of file scip_nlp.c.

References FALSE, NULL, SCIP_CALL, SCIP_ERROR, SCIP_OKAY, SCIPcheckStage, SCIPerrorMessage, SCIPnlpHasContinuousNonlinearity(), and TRUE.

Referenced by SCIP_DECL_HEUREXEC(), and SCIPupdateStartpointHeurSubNlp().

◆ SCIPgetNLPVarsData()

SCIP_RETCODE SCIPgetNLPVarsData	(	SCIP *	scip,
		SCIP_VAR ***	vars,
		int *	nvars
	)

gets current NLP variables along with the current number of NLP variables

Precondition

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

Parameters

scip	SCIP data structure
vars	pointer to store the array of NLP variables, or NULL
nvars	pointer to store the number of NLP variables, or NULL

Definition at line 149 of file scip_nlp.c.

References FALSE, NULL, SCIP_CALL, SCIP_INVALIDCALL, SCIP_OKAY, SCIPcheckStage, SCIPerrorMessage, SCIPnlpGetNVars(), SCIPnlpGetVars(), and TRUE.

◆ SCIPgetNLPVars()

SCIP_VAR ** SCIPgetNLPVars ( SCIP * scip )

gets array with variables of the NLP

Precondition

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

Parameters

scip	SCIP data structure

Definition at line 179 of file scip_nlp.c.

References FALSE, NULL, SCIP_CALL_ABORT, SCIPABORT, SCIPcheckStage, SCIPerrorMessage, SCIPnlpGetVars(), and TRUE.

Referenced by computeStandardNLPOptimalityCut(), SCIPapplyHeurDualval(), separateCuts(), and solveSubNLP().

◆ SCIPgetNNLPVars()

int SCIPgetNNLPVars ( SCIP * scip )

gets current number of variables in NLP

Precondition

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

Parameters

scip	SCIP data structure

Definition at line 201 of file scip_nlp.c.

References FALSE, NULL, SCIP_CALL_ABORT, SCIPABORT, SCIPcheckStage, SCIPerrorMessage, SCIPnlpGetNVars(), and TRUE.

Referenced by computeStandardNLPOptimalityCut(), countNonlinearities(), initBounds(), SCIPapplyHeurDualval(), separateCuts(), and solveSubNLP().

◆ SCIPgetNLPVarsNonlinearity()

SCIP_RETCODE SCIPgetNLPVarsNonlinearity	(	SCIP *	scip,
		int *	nlcount
	)

computes for each variables the number of NLP rows in which the variable appears in the nonlinear part

Precondition

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

Parameters

scip	SCIP data structure
nlcount	an array of length at least SCIPnlpGetNVars() to store nonlinearity counts of variables

Definition at line 223 of file scip_nlp.c.

References FALSE, NULL, SCIP_CALL, SCIP_INVALIDCALL, SCIP_OKAY, SCIPcheckStage, SCIPerrorMessage, SCIPnlpGetVarsNonlinearity(), and TRUE.

Referenced by countNonlinearities(), and initBounds().

◆ SCIPgetNLPVarsLbDualsol()

SCIP_Real * SCIPgetNLPVarsLbDualsol ( SCIP * scip )

returns dual solution values associated with lower bounds of NLP variables

Precondition

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

Parameters

scip	SCIP data structure

Definition at line 247 of file scip_nlp.c.

References FALSE, NULL, SCIP_CALL_ABORT, SCIPABORT, SCIPcheckStage, SCIPerrorMessage, SCIPnlpGetVarsLbDualsol(), and TRUE.

◆ SCIPgetNLPVarsUbDualsol()

SCIP_Real * SCIPgetNLPVarsUbDualsol ( SCIP * scip )

returns dual solution values associated with upper bounds of NLP variables

Precondition

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

Parameters

scip	SCIP data structure

Definition at line 269 of file scip_nlp.c.

References FALSE, NULL, SCIP_CALL_ABORT, SCIPABORT, SCIPcheckStage, SCIPerrorMessage, SCIPnlpGetVarsUbDualsol(), and TRUE.

◆ SCIPgetNLPNlRowsData()

SCIP_RETCODE SCIPgetNLPNlRowsData	(	SCIP *	scip,
		SCIP_NLROW ***	nlrows,
		int *	nnlrows
	)

gets current NLP nonlinear rows along with the current number of NLP nonlinear rows

Precondition

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

Parameters

scip	SCIP data structure
nlrows	pointer to store the array of NLP nonlinear rows, or NULL
nnlrows	pointer to store the number of NLP nonlinear rows, or NULL

Definition at line 291 of file scip_nlp.c.

References FALSE, NULL, SCIP_CALL, SCIP_INVALIDCALL, SCIP_OKAY, SCIPcheckStage, SCIPerrorMessage, SCIPnlpGetNlRows(), SCIPnlpGetNNlRows(), and TRUE.

◆ SCIPgetNLPNlRows()

SCIP_NLROW ** SCIPgetNLPNlRows ( SCIP * scip )

gets array with nonlinear rows of the NLP

Precondition

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

Parameters

scip	SCIP data structure

Definition at line 319 of file scip_nlp.c.

References FALSE, NULL, SCIP_CALL_ABORT, SCIPABORT, SCIPcheckStage, SCIPerrorMessage, SCIPnlpGetNlRows(), and TRUE.

Referenced by applyHeur(), applyNlobbt(), computeInteriorPoint(), computeStandardNLPFeasibilityCut(), computeStandardNLPOptimalityCut(), createAuxiliaryNonlinearSubproblem(), createNLP(), heurExec(), isNlobbtApplicable(), SCIP_DECL_HEUREXEC(), SCIP_DECL_RELAXEXEC(), and SCIP_DECL_SEPAEXECLP().

◆ SCIPgetNNLPNlRows()

int SCIPgetNNLPNlRows ( SCIP * scip )

gets current number of nonlinear rows in NLP

Precondition

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

Parameters

scip	SCIP data structure

Definition at line 341 of file scip_nlp.c.

References FALSE, NULL, SCIP_CALL_ABORT, SCIPABORT, SCIPcheckStage, SCIPerrorMessage, SCIPnlpGetNNlRows(), and TRUE.

Referenced by addRegularScholtes(), applyHeur(), applyNlobbt(), computeInteriorPoint(), computeStandardNLPFeasibilityCut(), computeStandardNLPOptimalityCut(), createAuxiliaryNonlinearSubproblem(), createNLP(), heurExec(), isNlobbtApplicable(), SCIP_DECL_HEUREXEC(), SCIP_DECL_RELAXEXEC(), and SCIP_DECL_SEPAEXECLP().

◆ SCIPgetNLPNlRowsStat()

SCIP_RETCODE SCIPgetNLPNlRowsStat	(	SCIP *	scip,
		int *	nlinear,
		int *	nconvexineq,
		int *	nnonconvexineq,
		int *	nnonlineareq
	)

gets statistics on convexity of rows in NLP

Reports counts on the current number of linear rows, convex inequalities, nonconvex inequalities, and nonlinear equalities or ranged rows.

A nonlinear inequality with infinity left-hand-side is accounted as convex if its expression has been marked as convex.
A nonlinear inequality with infinity right-hand-side is accounted as convex if its expression has been marked as concave.
Other nonlinear rows are accounted as nonconvex. Note that convexity for a nonlinear row may just not have been detected.

Precondition

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

Parameters

scip	SCIP data structure
nlinear	buffer to store number of linear rows in NLP, or NULL
nconvexineq	buffer to store number of convex inequalities in NLP, or NULL
nnonconvexineq	buffer to store number of nonconvex inequalities in NLP, or NULL
nnonlineareq	buffer to store number of nonlinear equalities or ranged rows in NLP, or NULL

Definition at line 369 of file scip_nlp.c.

References FALSE, NULL, SCIP_CALL, SCIP_ERROR, SCIP_OKAY, SCIPcheckStage, SCIPerrorMessage, SCIPnlpGetNlRowsStat(), and TRUE.

Referenced by SCIPcollectNLPStatistics(), and SCIPprintNLPStatistics().

◆ SCIPaddNlRow()

SCIP_RETCODE SCIPaddNlRow	(	SCIP *	scip,
		SCIP_NLROW *	nlrow
	)

adds a nonlinear row to the NLP. This row is captured by the NLP.

Precondition

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

Parameters

scip	SCIP data structure
nlrow	nonlinear row to add to NLP

Definition at line 396 of file scip_nlp.c.

References FALSE, NULL, SCIP_CALL, SCIP_INVALIDCALL, SCIP_OKAY, SCIPblkmem(), SCIPcheckStage, SCIPerrorMessage, SCIPnlpAddNlRow(), and TRUE.

Referenced by addKnapsackConstraints(), addLinearConstraints(), addLogicOrConstraints(), addNlrow(), addSetppcConstraints(), addVarboundConstraints(), initSolve(), and SCIP_DECL_CONSINITSOL().

◆ SCIPdelNlRow()

SCIP_RETCODE SCIPdelNlRow	(	SCIP *	scip,
		SCIP_NLROW *	nlrow
	)

removes a nonlinear row from the NLP

This row is released in the NLP.

Precondition

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

Parameters

scip	SCIP data structure
nlrow	nonlinear row to add to NLP

Definition at line 424 of file scip_nlp.c.

References FALSE, NULL, SCIP_CALL, SCIP_INVALIDCALL, SCIP_OKAY, SCIPblkmem(), SCIPcheckStage, SCIPerrorMessage, SCIPnlpDelNlRow(), and TRUE.

Referenced by deinitSolve(), and SCIP_DECL_CONSDEACTIVE().

◆ SCIPflushNLP()

SCIP_RETCODE SCIPflushNLP ( SCIP * scip )

makes sure that the NLP of the current node is flushed

Precondition

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

Parameters

scip	SCIP data structure

Definition at line 448 of file scip_nlp.c.

References FALSE, NULL, SCIP_CALL, SCIP_INVALIDCALL, SCIP_OKAY, SCIPcheckStage, SCIPerrorMessage, SCIPnlpFlush(), and TRUE.

◆ SCIPsetNLPInitialGuess()

SCIP_RETCODE SCIPsetNLPInitialGuess	(	SCIP *	scip,
		SCIP_Real *	initialguess
	)

sets or clears initial primal guess for NLP solution (start point for NLP solver)

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:

Parameters

scip	SCIP data structure
initialguess	values of initial guess (corresponding to variables from SCIPgetNLPVarsData), or NULL to use no start point

Definition at line 474 of file scip_nlp.c.

References FALSE, NULL, SCIP_CALL, SCIP_INVALIDCALL, SCIP_OKAY, SCIPblkmem(), SCIPcheckStage, SCIPerrorMessage, SCIPnlpSetInitialGuess(), and TRUE.

Referenced by SCIPapplyHeurDualval(), and solveSubNLP().

◆ SCIPsetNLPInitialGuessSol()

SCIP_RETCODE SCIPsetNLPInitialGuessSol	(	SCIP *	scip,
		SCIP_SOL *	sol
	)

sets initial primal guess for NLP solution (start point for NLP solver)

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:

Parameters

scip	SCIP data structure
sol	solution which values should be taken as initial guess, or NULL for LP solution

Definition at line 501 of file scip_nlp.c.

References FALSE, NULL, SCIP_CALL, SCIP_INVALIDCALL, SCIP_OKAY, SCIP_Real, SCIPallocBufferArray, SCIPblkmem(), SCIPcheckStage, SCIPerrorMessage, SCIPfreeBufferArray, SCIPgetSolVals(), SCIPnlpGetNVars(), SCIPnlpGetVars(), SCIPnlpSetInitialGuess(), and TRUE.

Referenced by computeFixingrate(), getFixingValue(), and SCIP_DECL_HEUREXEC().

◆ SCIPsolveNLPParam()

SCIP_RETCODE SCIPsolveNLPParam	(	SCIP *	scip,
		SCIP_NLPPARAM	param
	)

solves the current NLP (or diving NLP if in diving mode) with given parameters

Typical use is

SCIP_NLPPARAM nlparam = { SCIP_NLPPARAM_DEFAULT(scip); }
nlpparam.iterlimit = 42;
SCIP_CALL( SCIPsolveNLPParam(scip, nlpparam) );

or, in one line:

SCIP_CALL( SCIPsolveNLPParam(scip, (SCIP_NLPPARAM){ SCIP_NLPPARAM_DEFAULT(scip), .iterlimit = 42 }) );

To get the latter, also SCIPsolveNLP can be used.

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:

Parameters

scip	SCIP data structure
param	NLP solve parameters

Definition at line 545 of file scip_nlp.c.

References FALSE, NULL, SCIP_CALL, SCIP_INVALIDCALL, SCIP_OKAY, SCIPblkmem(), SCIPcheckStage, SCIPerrorMessage, SCIPnlpSolve(), and TRUE.

Referenced by resolveNLPWithTighterFeastol(), SCIPbendersComputeSubproblemLowerbound(), and SCIPbendersSolveSubproblemLP().

◆ SCIPgetNLPSolstat()

SCIP_NLPSOLSTAT SCIPgetNLPSolstat ( SCIP * scip )

gets solution status of current NLP

Precondition

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

Parameters

scip	SCIP data structure

Definition at line 574 of file scip_nlp.c.

References FALSE, NULL, SCIP_CALL_ABORT, SCIP_NLPSOLSTAT_UNKNOWN, SCIPABORT, SCIPcheckStage, SCIPerrorMessage, SCIPnlpGetSolstat(), and TRUE.

Referenced by computeFixingrate(), computeStandardNLPFeasibilityCut(), computeStandardNLPOptimalityCut(), getFixingValue(), resolveNLPWithTighterFeastol(), SCIP_DECL_BENDERSCUTEXEC(), SCIP_DECL_HEUREXEC(), SCIPapplyHeurDualval(), SCIPbendersComputeSubproblemLowerbound(), SCIPbendersSolveSubproblemLP(), solveSubNLP(), and storeSolution().

◆ SCIPgetNLPTermstat()

SCIP_NLPTERMSTAT SCIPgetNLPTermstat ( SCIP * scip )

gets termination status of last NLP solve

Precondition

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

Parameters

scip	SCIP data structure

Definition at line 596 of file scip_nlp.c.

References FALSE, NULL, SCIP_CALL_ABORT, SCIP_NLPTERMSTAT_OTHER, SCIPABORT, SCIPcheckStage, SCIPerrorMessage, SCIPnlpGetTermstat(), and TRUE.

Referenced by resolveNLPWithTighterFeastol(), SCIP_DECL_HEUREXEC(), SCIPbendersComputeSubproblemLowerbound(), SCIPbendersSolveSubproblemLP(), and solveSubNLP().

◆ SCIPgetNLPStatistics()

SCIP_RETCODE SCIPgetNLPStatistics	(	SCIP *	scip,
		SCIP_NLPSTATISTICS *	statistics
	)

gives statistics (number of iterations, solving time, ...) of last NLP solve

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:

Parameters

scip	SCIP data structure
statistics	pointer to store statistics

Definition at line 621 of file scip_nlp.c.

References FALSE, NULL, SCIP_CALL, SCIP_INVALIDCALL, SCIP_OKAY, SCIPcheckStage, SCIPerrorMessage, SCIPnlpGetStatistics(), and TRUE.

Referenced by SCIP_DECL_HEUREXEC(), and solveSubNLP().

◆ SCIPgetNLPObjval()

SCIP_Real SCIPgetNLPObjval ( SCIP * scip )

gets objective value of current NLP

Precondition

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

Parameters

scip	SCIP data structure

Definition at line 645 of file scip_nlp.c.

References FALSE, NULL, SCIP_CALL_ABORT, SCIP_INVALID, SCIPcheckStage, SCIPerrorMessage, SCIPnlpGetObjval(), and TRUE.

Referenced by processNLPSol(), SCIP_DECL_HEUREXEC(), SCIPbendersComputeSubproblemLowerbound(), SCIPbendersSolveSubproblemLP(), separateCuts(), and solveSubNLP().

◆ SCIPhasNLPSolution()

SCIP_Bool SCIPhasNLPSolution ( SCIP * scip )

indicates whether a solution for the current NLP is available

The solution may be optimal, feasible, or infeasible. Thus, returns whether the NLP solution status is at most SCIP_NLPSOLSTAT_LOCINFEASIBLE.

Precondition

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

Parameters

scip	SCIP data structure

Definition at line 671 of file scip_nlp.c.

References FALSE, NULL, SCIP_CALL_ABORT, SCIPABORT, SCIPcheckStage, SCIPerrorMessage, SCIPnlpHasSolution(), and TRUE.

Referenced by computeStandardNLPOptimalityCut(), createSolFromNLP(), and processNLPSol().

◆ SCIPgetNLPFracVars()

SCIP_RETCODE SCIPgetNLPFracVars	(	SCIP *	scip,
		SCIP_VAR ***	fracvars,
		SCIP_Real **	fracvarssol,
		SCIP_Real **	fracvarsfrac,
		int *	nfracvars,
		int *	npriofracvars
	)

gets fractional variables of last NLP solution along with solution values and fractionalities

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:

Parameters

scip	SCIP data structure
fracvars	pointer to store the array of NLP fractional variables, or NULL
fracvarssol	pointer to store the array of NLP fractional variables solution values, or NULL
fracvarsfrac	pointer to store the array of NLP fractional variables fractionalities, or NULL
nfracvars	pointer to store the number of NLP fractional variables , or NULL
npriofracvars	pointer to store the number of NLP fractional variables with maximal branching priority, or NULL

Definition at line 696 of file scip_nlp.c.

References FALSE, NULL, SCIP_CALL, SCIP_INVALIDCALL, SCIP_OKAY, SCIPblkmem(), SCIPcheckStage, SCIPerrorMessage, SCIPnlpGetFracVars(), and TRUE.

Referenced by getNLPFracVars().

◆ SCIPwriteNLP()

SCIP_RETCODE SCIPwriteNLP	(	SCIP *	scip,
		const char *	filename
	)

writes current NLP to a file

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:

Parameters

scip	SCIP data structure
filename	file name

Definition at line 727 of file scip_nlp.c.

References FALSE, NULL, SCIP_CALL, SCIP_INVALIDCALL, SCIP_OKAY, SCIPcheckStage, SCIPerrorMessage, SCIPnlpWrite(), and TRUE.

Referenced by SCIP_DECL_DIALOGEXEC().

◆ SCIPgetNLPI()

SCIP_RETCODE SCIPgetNLPI	(	SCIP *	scip,
		SCIP_NLPI **	nlpi,
		SCIP_NLPIPROBLEM **	nlpiproblem
	)

gets the NLP interface and problem used by the SCIP NLP

Warning: With the NLPI and its problem, all methods defined in scip_nlpi.h and pub_nlpi.h can be used. It needs to be ensured that the full internal state of the NLPI does not change or is recovered completely after the end of the method that uses the NLPI. In particular, if the NLP or its solution is manipulated (e.g. by calling one of the SCIPaddNlpi...() or the SCIPsolveNlpi() method), one has to check in advance whether the NLP is currently solved. If this is the case, one has to make sure that the internal solution status is recovered completely again. Additionally one has to resolve the NLP with SCIPsolveNlpi() in order to reinstall the internal solution status.

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:

Parameters

scip	SCIP data structure
nlpi	pointer to store the NLP solver interface
nlpiproblem	pointer to store the NLP solver interface problem

Definition at line 762 of file scip_nlp.c.

References FALSE, NULL, SCIP_CALL, SCIP_INVALIDCALL, SCIP_OKAY, SCIPcheckStage, SCIPerrorMessage, SCIPnlpGetNLPI(), SCIPnlpGetNLPIProblem(), and TRUE.

SCIP

Detailed Description

Modules

Macros

Functions

Macro Definition Documentation

◆ SCIPsolveNLP

Function Documentation

◆ SCIPisNLPEnabled()

◆ SCIPenableNLP()

◆ SCIPisNLPConstructed()

◆ SCIPhasNLPContinuousNonlinearity()

◆ SCIPgetNLPVarsData()

◆ SCIPgetNLPVars()

◆ SCIPgetNNLPVars()

◆ SCIPgetNLPVarsNonlinearity()

◆ SCIPgetNLPVarsLbDualsol()

◆ SCIPgetNLPVarsUbDualsol()

◆ SCIPgetNLPNlRowsData()

◆ SCIPgetNLPNlRows()

◆ SCIPgetNNLPNlRows()

◆ SCIPgetNLPNlRowsStat()

◆ SCIPaddNlRow()

◆ SCIPdelNlRow()

◆ SCIPflushNLP()

◆ SCIPsetNLPInitialGuess()

◆ SCIPsetNLPInitialGuessSol()

◆ SCIPsolveNLPParam()

◆ SCIPgetNLPSolstat()

◆ SCIPgetNLPTermstat()

◆ SCIPgetNLPStatistics()

◆ SCIPgetNLPObjval()

◆ SCIPhasNLPSolution()

◆ SCIPgetNLPFracVars()

◆ SCIPwriteNLP()

◆ SCIPgetNLPI()