1 | /* $Id: ClpAmplObjective.hpp 1854 2013-01-28 00:02:55Z stefan $ */ |
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2 | // Copyright (C) 2007, International Business Machines |
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3 | // Corporation and others. All Rights Reserved. |
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4 | // This code is licensed under the terms of the Eclipse Public License (EPL). |
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5 | |
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6 | #ifndef ClpAmplObjective_H |
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7 | #define ClpAmplObjective_H |
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8 | |
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9 | #include "ClpObjective.hpp" |
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10 | #include "CoinPackedMatrix.hpp" |
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11 | |
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12 | //############################################################################# |
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13 | |
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14 | /** Ampl Objective Class |
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15 | |
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16 | */ |
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17 | |
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18 | class ClpAmplObjective : public ClpObjective { |
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19 | |
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20 | public: |
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21 | |
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22 | ///@name Stuff |
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23 | //@{ |
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24 | |
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25 | /** Returns gradient. If Ampl then solution may be NULL, |
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26 | also returns an offset (to be added to current one) |
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27 | If refresh is false then uses last solution |
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28 | Uses model for scaling |
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29 | includeLinear 0 - no, 1 as is, 2 as feasible |
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30 | */ |
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31 | virtual double * gradient(const ClpSimplex * model, |
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32 | const double * solution, double & offset, bool refresh, |
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33 | int includeLinear = 2); |
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34 | /// Resize objective |
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35 | /** Returns reduced gradient.Returns an offset (to be added to current one). |
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36 | */ |
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37 | virtual double reducedGradient(ClpSimplex * model, double * region, |
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38 | bool useFeasibleCosts); |
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39 | /** Returns step length which gives minimum of objective for |
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40 | solution + theta * change vector up to maximum theta. |
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41 | |
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42 | arrays are numberColumns+numberRows |
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43 | Also sets current objective, predicted and at maximumTheta |
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44 | */ |
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45 | virtual double stepLength(ClpSimplex * model, |
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46 | const double * solution, |
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47 | const double * change, |
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48 | double maximumTheta, |
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49 | double & currentObj, |
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50 | double & predictedObj, |
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51 | double & thetaObj); |
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52 | /// Return objective value (without any ClpModel offset) (model may be NULL) |
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53 | virtual double objectiveValue(const ClpSimplex * model, const double * solution) const ; |
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54 | virtual void resize(int newNumberColumns) ; |
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55 | /// Delete columns in objective |
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56 | virtual void deleteSome(int numberToDelete, const int * which) ; |
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57 | /// Scale objective |
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58 | virtual void reallyScale(const double * columnScale) ; |
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59 | /** Given a zeroed array sets nonlinear columns to 1. |
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60 | Returns number of nonlinear columns |
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61 | */ |
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62 | virtual int markNonlinear(char * which); |
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63 | |
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64 | /// Say we have new primal solution - so may need to recompute |
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65 | virtual void newXValues() ; |
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66 | //@} |
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67 | |
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68 | |
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69 | ///@name Constructors and destructors |
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70 | //@{ |
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71 | /// Default Constructor |
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72 | ClpAmplObjective(); |
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73 | |
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74 | /// Constructor from ampl info |
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75 | ClpAmplObjective(void * amplInfo); |
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76 | |
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77 | /** Copy constructor . |
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78 | */ |
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79 | ClpAmplObjective(const ClpAmplObjective & rhs); |
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80 | |
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81 | /// Assignment operator |
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82 | ClpAmplObjective & operator=(const ClpAmplObjective& rhs); |
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83 | |
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84 | /// Destructor |
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85 | virtual ~ClpAmplObjective (); |
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86 | |
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87 | /// Clone |
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88 | virtual ClpObjective * clone() const; |
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89 | |
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90 | //@} |
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91 | ///@name Gets and sets |
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92 | //@{ |
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93 | /// Linear objective |
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94 | double * linearObjective() const; |
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95 | //@} |
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96 | |
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97 | //--------------------------------------------------------------------------- |
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98 | |
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99 | private: |
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100 | ///@name Private member data |
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101 | /// Saved offset |
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102 | double offset_; |
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103 | /// Ampl info |
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104 | void * amplObjective_; |
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105 | /// Objective |
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106 | double * objective_; |
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107 | /// Gradient |
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108 | double * gradient_; |
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109 | //@} |
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110 | }; |
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111 | |
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112 | #endif |
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113 | |
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