source: trunk/Clp/src/ClpLinearObjective.hpp @ 1502

Last change on this file since 1502 was 1502, checked in by forrest, 10 years ago

moving sandbox stuff to trunk

  • Property svn:eol-style set to native
  • Property svn:keywords set to Id
File size: 3.2 KB
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1/* $Id: ClpLinearObjective.hpp 1502 2010-01-29 14:25:07Z forrest $ */
2// Copyright (C) 2003, International Business Machines
3// Corporation and others.  All Rights Reserved.
4#ifndef ClpLinearObjective_H
5#define ClpLinearObjective_H
6
7#include "ClpObjective.hpp"
8
9//#############################################################################
10
11/** Linear Objective Class
12
13*/
14
15class ClpLinearObjective : public ClpObjective {
16
17public:
18
19    ///@name Stuff
20    //@{
21
22    /** Returns gradient.  If Linear then solution may be NULL,
23        also returns an offset (to be added to current one)
24        If refresh is false then uses last solution
25        Uses model for scaling
26        includeLinear 0 - no, 1 as is, 2 as feasible
27    */
28    virtual double * gradient(const ClpSimplex * model,
29                              const double * solution, double & offset, bool refresh,
30                              int includeLinear = 2);
31    /** Returns reduced gradient.Returns an offset (to be added to current one).
32    */
33    virtual double reducedGradient(ClpSimplex * model, double * region,
34                                   bool useFeasibleCosts);
35    /** Returns step length which gives minimum of objective for
36        solution + theta * change vector up to maximum theta.
37
38        arrays are numberColumns+numberRows
39        Also sets current objective, predicted and at maximumTheta
40    */
41    virtual double stepLength(ClpSimplex * model,
42                              const double * solution,
43                              const double * change,
44                              double maximumTheta,
45                              double & currentObj,
46                              double & predictedObj,
47                              double & thetaObj);
48    /// Return objective value (without any ClpModel offset) (model may be NULL)
49    virtual double objectiveValue(const ClpSimplex * model, const double * solution) const ;
50    /// Resize objective
51    virtual void resize(int newNumberColumns) ;
52    /// Delete columns in  objective
53    virtual void deleteSome(int numberToDelete, const int * which) ;
54    /// Scale objective
55    virtual void reallyScale(const double * columnScale) ;
56
57    //@}
58
59
60    ///@name Constructors and destructors
61    //@{
62    /// Default Constructor
63    ClpLinearObjective();
64
65    /// Constructor from objective
66    ClpLinearObjective(const double * objective, int numberColumns);
67
68    /// Copy constructor
69    ClpLinearObjective(const ClpLinearObjective &);
70    /** Subset constructor.  Duplicates are allowed
71        and order is as given.
72    */
73    ClpLinearObjective (const ClpLinearObjective &rhs, int numberColumns,
74                        const int * whichColumns) ;
75
76    /// Assignment operator
77    ClpLinearObjective & operator=(const ClpLinearObjective& rhs);
78
79    /// Destructor
80    virtual ~ClpLinearObjective ();
81
82    /// Clone
83    virtual ClpObjective * clone() const;
84    /** Subset clone.  Duplicates are allowed
85        and order is as given.
86    */
87    virtual ClpObjective * subsetClone (int numberColumns,
88                                        const int * whichColumns) const;
89
90    //@}
91
92    //---------------------------------------------------------------------------
93
94private:
95    ///@name Private member data
96    /// Objective
97    double * objective_;
98    /// number of columns
99    int numberColumns_;
100    //@}
101};
102
103#endif
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