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+/* $Id: ClpAmplObjective.hpp 1899 2013-04-09 18:12:08Z stefan $ */
+// Copyright (C) 2007, International Business Machines
+// Corporation and others. All Rights Reserved.
+// This code is licensed under the terms of the Eclipse Public License (EPL).
+
+#ifndef ClpAmplObjective_H
+#define ClpAmplObjective_H
+
+#include "ClpObjective.hpp"
+#include "CoinPackedMatrix.hpp"
+
+//#############################################################################
+
+/** Ampl Objective Class
+
+*/
+
+class ClpAmplObjective : public ClpObjective {
+
+public:
+
+ ///@name Stuff
+ //@{
+
+ /** Returns gradient. If Ampl then solution may be NULL,
+ also returns an offset (to be added to current one)
+ If refresh is false then uses last solution
+ Uses model for scaling
+ includeLinear 0 - no, 1 as is, 2 as feasible
+ */
+ virtual double * gradient(const ClpSimplex * model,
+ const double * solution, double & offset, bool refresh,
+ int includeLinear = 2);
+ /// Resize objective
+ /** 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 ;
+ 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) ;
+ /** Given a zeroed array sets nonlinear columns to 1.
+ Returns number of nonlinear columns
+ */
+ virtual int markNonlinear(char * which);
+
+ /// Say we have new primal solution - so may need to recompute
+ virtual void newXValues() ;
+ //@}
+
+
+ ///@name Constructors and destructors
+ //@{
+ /// Default Constructor
+ ClpAmplObjective();
+
+ /// Constructor from ampl info
+ ClpAmplObjective(void * amplInfo);
+
+ /** Copy constructor .
+ */
+ ClpAmplObjective(const ClpAmplObjective & rhs);
+
+ /// Assignment operator
+ ClpAmplObjective & operator=(const ClpAmplObjective& rhs);
+
+ /// Destructor
+ virtual ~ClpAmplObjective ();
+
+ /// Clone
+ virtual ClpObjective * clone() const;
+
+ //@}
+ ///@name Gets and sets
+ //@{
+ /// Linear objective
+ double * linearObjective() const;
+ //@}
+
+ //---------------------------------------------------------------------------
+
+private:
+ ///@name Private member data
+ /// Saved offset
+ double offset_;
+ /// Ampl info
+ void * amplObjective_;
+ /// Objective
+ double * objective_;
+ /// Gradient
+ double * gradient_;
+ //@}
+};
+
+#endif
+