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CbcBranchDefaultDecision Class Reference

Branching decision default class. More...

#include <CbcBranchDefaultDecision.hpp>

Inheritance diagram for CbcBranchDefaultDecision:
Collaboration diagram for CbcBranchDefaultDecision:

List of all members.

Public Member Functions

 CbcBranchDefaultDecision ()
 CbcBranchDefaultDecision (const CbcBranchDefaultDecision &)
virtual ~CbcBranchDefaultDecision ()
virtual CbcBranchDecisionclone () const
 Clone.
virtual void initialize (CbcModel *model)
 Initialize, e.g. before the start of branch selection at a node.
virtual int betterBranch (CbcBranchingObject *thisOne, CbcBranchingObject *bestSoFar, double changeUp, int numInfUp, double changeDn, int numInfDn)
 Compare two branching objects.
virtual void setBestCriterion (double value)
 Sets or gets best criterion so far.
virtual double getBestCriterion () const
virtual int bestBranch (CbcBranchingObject **objects, int numberObjects, int numberUnsatisfied, double *changeUp, int *numberInfeasibilitiesUp, double *changeDown, int *numberInfeasibilitiesDown, double objectiveValue)
 Compare N branching objects.

Detailed Description

Branching decision default class.

This class implements a simple default algorithm (betterBranch()) for choosing a branching variable.

Definition at line 18 of file CbcBranchDefaultDecision.hpp.


Constructor & Destructor Documentation

CbcBranchDefaultDecision::CbcBranchDefaultDecision ( )
CbcBranchDefaultDecision::CbcBranchDefaultDecision ( const CbcBranchDefaultDecision )
virtual CbcBranchDefaultDecision::~CbcBranchDefaultDecision ( ) [virtual]

Member Function Documentation

virtual CbcBranchDecision* CbcBranchDefaultDecision::clone ( ) const [virtual]

Clone.

Implements CbcBranchDecision.

virtual void CbcBranchDefaultDecision::initialize ( CbcModel model) [virtual]

Initialize, e.g. before the start of branch selection at a node.

Implements CbcBranchDecision.

virtual int CbcBranchDefaultDecision::betterBranch ( CbcBranchingObject thisOne,
CbcBranchingObject bestSoFar,
double  changeUp,
int  numInfUp,
double  changeDn,
int  numInfDn 
) [virtual]

Compare two branching objects.

Return nonzero if thisOne is better than bestSoFar.

The routine compares branches using the values supplied in numInfUp and numInfDn until a solution is found by search, after which it uses the values supplied in changeUp and changeDn. The best branching object seen so far and the associated parameter values are remembered in the CbcBranchDefaultDecision object. The nonzero return value is +1 if the up branch is preferred, -1 if the down branch is preferred.

As the names imply, the assumption is that the values supplied for numInfUp and numInfDn will be the number of infeasibilities reported by the branching object, and changeUp and changeDn will be the estimated change in objective. Other measures can be used if desired.

Because an CbcBranchDefaultDecision object remembers the current best branching candidate (#bestObject_) as well as the values used in the comparison, the parameter bestSoFar is redundant, hence unused.

Implements CbcBranchDecision.

virtual void CbcBranchDefaultDecision::setBestCriterion ( double  value) [virtual]

Sets or gets best criterion so far.

Reimplemented from CbcBranchDecision.

virtual double CbcBranchDefaultDecision::getBestCriterion ( ) const [virtual]

Reimplemented from CbcBranchDecision.

virtual int CbcBranchDefaultDecision::bestBranch ( CbcBranchingObject **  objects,
int  numberObjects,
int  numberUnsatisfied,
double *  changeUp,
int *  numberInfeasibilitiesUp,
double *  changeDown,
int *  numberInfeasibilitiesDown,
double  objectiveValue 
) [virtual]

Compare N branching objects.

Return index of best and sets way of branching in chosen object.

This routine is used only after strong branching.

Reimplemented from CbcBranchDecision.


The documentation for this class was generated from the following file:
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