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/* $Id: ClpConstraintQuadratic.hpp 1665 2011-01-04 17:55:54Z lou $ */
// 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 ClpConstraintQuadratic_H
#define ClpConstraintQuadratic_H
#include "ClpConstraint.hpp"
//#############################################################################
/** Quadratic Constraint Class
*/
class ClpConstraintQuadratic : public ClpConstraint {
public:
///@name Stuff
//@{
/** Fills gradient. If Quadratic then solution may be NULL,
also returns true value of function and offset so we can use x not deltaX in constraint
If refresh is false then uses last solution
Uses model for scaling
Returns non-zero if gradient udefined at current solution
*/
virtual int gradient(const ClpSimplex * model,
const double * solution,
double * gradient,
double & functionValue ,
double & offset,
bool useScaling = false,
bool refresh = true) const ;
/// Resize constraint
virtual void resize(int newNumberColumns) ;
/// Delete columns in constraint
virtual void deleteSome(int numberToDelete, const int * which) ;
/// Scale constraint
virtual void reallyScale(const double * columnScale) ;
/** Given a zeroed array sets nonquadratic columns to 1.
Returns number of nonquadratic columns
*/
virtual int markNonlinear(char * which) const ;
/** Given a zeroed array sets possible nonzero coefficients to 1.
Returns number of nonzeros
*/
virtual int markNonzero(char * which) const;
//@}
///@name Constructors and destructors
//@{
/// Default Constructor
ClpConstraintQuadratic();
/// Constructor from quadratic
ClpConstraintQuadratic(int row, int numberQuadraticColumns, int numberColumns,
const CoinBigIndex * start,
const int * column, const double * element);
/** Copy constructor .
*/
ClpConstraintQuadratic(const ClpConstraintQuadratic & rhs);
/// Assignment operator
ClpConstraintQuadratic & operator=(const ClpConstraintQuadratic& rhs);
/// Destructor
virtual ~ClpConstraintQuadratic ();
/// Clone
virtual ClpConstraint * clone() const;
//@}
///@name Gets and sets
//@{
/// Number of coefficients
virtual int numberCoefficients() const;
/// Number of columns in constraint
inline int numberColumns() const {
return numberColumns_;
}
/// Column starts
inline CoinBigIndex * start() const {
return start_;
}
/// Columns
inline const int * column() const {
return column_;
}
/// Coefficients
inline const double * coefficient() const {
return coefficient_;
}
//@}
//---------------------------------------------------------------------------
private:
///@name Private member data
/// Column starts
CoinBigIndex * start_;
/// Column (if -1 then linear coefficient)
int * column_;
/// Coefficients
double * coefficient_;
/// Useful to have number of columns about
int numberColumns_;
/// Number of coefficients in gradient
int numberCoefficients_;
/// Number of quadratic columns
int numberQuadraticColumns_;
//@}
};
#endif
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