Scippy

    SCIP

    Solving Constraint Integer Programs

    Functions
    NLP Diving
    Public API of SCIP » Core API » Solving Process » NLP Relaxation

    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:
    Parameters
    scipSCIP data structure

    Definition at line 802 of file scip_nlp.c.

    References FALSE, NULL, SCIP_CALL, SCIP_INVALIDCALL, SCIP_OKAY, SCIPblkmem(), SCIPcheckStage, SCIPerrorMessage, SCIPnlpStartDive(), 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:
    Parameters
    scipSCIP data structure

    Definition at line 830 of file scip_nlp.c.

    References FALSE, NULL, SCIP_CALL, SCIP_INVALIDCALL, SCIP_OKAY, SCIPblkmem(), SCIPcheckStage, SCIPerrorMessage, SCIPnlpEndDive(), 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:
    Parameters
    scipSCIP data structure
    varvariable which coefficient to change
    coefnew value for coefficient

    Definition at line 856 of file scip_nlp.c.

    References FALSE, NULL, SCIP_Var::scip, SCIP_CALL, SCIP_INVALIDCALL, SCIP_OKAY, SCIPblkmem(), SCIPcheckStage, SCIPerrorMessage, SCIPnlpChgVarObjDive(), 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:
    Parameters
    scipSCIP data structure
    varvariable which bounds to change
    lbnew lower bound
    ubnew upper bound

    Definition at line 886 of file scip_nlp.c.

    References FALSE, NULL, SCIP_Var::scip, SCIP_CALL, SCIP_INVALIDCALL, SCIP_OKAY, SCIPcheckStage, SCIPerrorMessage, SCIPnlpChgVarBoundsDive(), 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:
    Parameters
    scipSCIP data structure
    nvarsnumber of variables which bounds to changes
    varsvariables which bounds to change
    lbsnew lower bounds
    ubsnew upper bounds

    Definition at line 917 of file scip_nlp.c.

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