Branching decision default class. More...

#include <AbcBranchActual.h>

Inheritance diagram for AbcBranchDefaultDecision:

Collaboration diagram for AbcBranchDefaultDecision:

Public Member Functions
	AbcBranchDefaultDecision ()

	AbcBranchDefaultDecision (const AbcBranchDefaultDecision &)

virtual	~AbcBranchDefaultDecision ()

virtual AbcBranchDecision *	clone () const
	Clone. More...

virtual void	initialize (AbcModel *model)
	Initialize, e.g. before the start of branch selection at a node. More...

virtual int	betterBranch (int thisOne, int bestSoFar, double changeUp, int numInfUp, double changeDn, int numInfDn)
	Compare two branching objects. More...

Public Member Functions inherited from AbcBranchDecision
	AbcBranchDecision ()
	Default Constructor. More...

virtual	~AbcBranchDecision ()
	Destructor. More...

virtual int	bestBranch (AbcModel model, int objects, int numberObjects, int numberUnsatisfied, double changeUp, int numberInfeasibilitiesUp, double changeDown, int numberInfeasibilitiesDown, double objectiveValue)
	Compare N branching objects. More...

Private Member Functions
AbcBranchDefaultDecision &	operator= (const AbcBranchDefaultDecision &rhs)
	Illegal Assignment operator. More...

Private Attributes
AbcModel *	model_
	data Point to the model More...

double	bestCriterion_
	"best" so far More...

double	bestChangeUp_
	Change up for best. More...

int	bestNumberUp_
	Number of infeasibilities for up. More...

double	bestChangeDown_
	Change down for best. More...

int	bestNumberDown_
	Number of infeasibilities for down. More...

int	bestObject_
	Index of the best branching integer variable. More...

Detailed Description

Branching decision default class.

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

Definition at line 38 of file AbcBranchActual.h.

Constructor & Destructor Documentation

AbcBranchDefaultDecision::AbcBranchDefaultDecision ( )

AbcBranchDefaultDecision::AbcBranchDefaultDecision ( const AbcBranchDefaultDecision & )

virtual AbcBranchDefaultDecision::~AbcBranchDefaultDecision ( )

virtual

Member Function Documentation

virtual AbcBranchDecision* AbcBranchDefaultDecision::clone ( ) const

virtual

Clone.

Implements AbcBranchDecision.

virtual void AbcBranchDefaultDecision::initialize ( AbcModel * model )

virtual

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

Implements AbcBranchDecision.

virtual int AbcBranchDefaultDecision::betterBranch	(	int	thisOne,
		int	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 AbcBranchDefaultDecision 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 AbcBranchDefaultDecision 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 AbcBranchDecision.

AbcBranchDefaultDecision& AbcBranchDefaultDecision::operator= ( const AbcBranchDefaultDecision & rhs )

private

Illegal Assignment operator.

Member Data Documentation

AbcModel* AbcBranchDefaultDecision::model_

private

data Point to the model

Definition at line 89 of file AbcBranchActual.h.

double AbcBranchDefaultDecision::bestCriterion_

private

"best" so far

Definition at line 92 of file AbcBranchActual.h.

double AbcBranchDefaultDecision::bestChangeUp_

private

Change up for best.

Definition at line 95 of file AbcBranchActual.h.

int AbcBranchDefaultDecision::bestNumberUp_

private

Number of infeasibilities for up.

Definition at line 98 of file AbcBranchActual.h.

double AbcBranchDefaultDecision::bestChangeDown_

private

Change down for best.

Definition at line 101 of file AbcBranchActual.h.

int AbcBranchDefaultDecision::bestNumberDown_

private

Number of infeasibilities for down.

Definition at line 104 of file AbcBranchActual.h.

int AbcBranchDefaultDecision::bestObject_

private

Index of the best branching integer variable.

Definition at line 107 of file AbcBranchActual.h.

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

/home/coin/svn-release/Blis-0.94.3/Alps/examples/Abc/AbcBranchActual.h

Public Member Functions

Private Member Functions

Private Attributes

Detailed Description

Constructor & Destructor Documentation

Member Function Documentation

Member Data Documentation