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/* $Id: ClpLinearObjective.hpp 1665 2011-01-04 17:55:54Z lou $ */
// Copyright (C) 2003, International Business Machines
// Corporation and others. All Rights Reserved.
// This code is licensed under the terms of the Eclipse Public License (EPL).
#ifndef ClpLinearObjective_H
#define ClpLinearObjective_H
#include "ClpObjective.hpp"
//#############################################################################
/** Linear Objective Class
*/
class ClpLinearObjective : public ClpObjective {
public:
///@name Stuff
//@{
/** Returns objective coefficients.
Offset is always set to 0.0. All other parameters unused.
*/
virtual double * gradient(const ClpSimplex * model,
const double * solution, double & offset, bool refresh,
int includeLinear = 2);
/** Returns reduced gradient.Returns an offset (to be added to current one).
*/
virtual double reducedGradient(ClpSimplex * model, double * region,
bool useFeasibleCosts);
/** Returns step length which gives minimum of objective for
solution + theta * change vector up to maximum theta.
arrays are numberColumns+numberRows
Also sets current objective, predicted and at maximumTheta
*/
virtual double stepLength(ClpSimplex * model,
const double * solution,
const double * change,
double maximumTheta,
double & currentObj,
double & predictedObj,
double & thetaObj);
/// Return objective value (without any ClpModel offset) (model may be NULL)
virtual double objectiveValue(const ClpSimplex * model, const double * solution) const ;
/// Resize objective
virtual void resize(int newNumberColumns) ;
/// Delete columns in objective
virtual void deleteSome(int numberToDelete, const int * which) ;
/// Scale objective
virtual void reallyScale(const double * columnScale) ;
//@}
///@name Constructors and destructors
//@{
/// Default Constructor
ClpLinearObjective();
/// Constructor from objective
ClpLinearObjective(const double * objective, int numberColumns);
/// Copy constructor
ClpLinearObjective(const ClpLinearObjective &);
/** Subset constructor. Duplicates are allowed
and order is as given.
*/
ClpLinearObjective (const ClpLinearObjective &rhs, int numberColumns,
const int * whichColumns) ;
/// Assignment operator
ClpLinearObjective & operator=(const ClpLinearObjective& rhs);
/// Destructor
virtual ~ClpLinearObjective ();
/// Clone
virtual ClpObjective * clone() const;
/** Subset clone. Duplicates are allowed
and order is as given.
*/
virtual ClpObjective * subsetClone (int numberColumns,
const int * whichColumns) const;
//@}
//---------------------------------------------------------------------------
private:
///@name Private member data
/// Objective
double * objective_;
/// number of columns
int numberColumns_;
//@}
};
#endif
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