1 | // Copyright (C) 2007, International Business Machines |
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2 | // Corporation and others. All Rights Reserved. |
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3 | #ifndef ClpConstraintQuadratic_H |
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4 | #define ClpConstraintQuadratic_H |
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5 | |
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6 | #include "ClpConstraint.hpp" |
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7 | |
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8 | //############################################################################# |
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9 | |
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10 | /** Quadratic Constraint Class |
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11 | |
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12 | */ |
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13 | |
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14 | class ClpConstraintQuadratic : public ClpConstraint { |
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15 | |
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16 | public: |
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17 | |
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18 | ///@name Stuff |
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19 | //@{ |
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20 | |
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21 | |
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22 | /** Fills gradient. If Quadratic then solution may be NULL, |
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23 | also returns true value of function and offset so we can use x not deltaX in constraint |
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24 | If refresh is false then uses last solution |
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25 | Uses model for scaling |
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26 | Returns non-zero if gradient udefined at current solution |
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27 | */ |
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28 | virtual int gradient(const ClpSimplex * model, |
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29 | const double * solution, |
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30 | double * gradient, |
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31 | double & functionValue , |
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32 | double & offset, |
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33 | bool useScaling=false, |
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34 | bool refresh=true) const ; |
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35 | /// Resize constraint |
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36 | virtual void resize(int newNumberColumns) ; |
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37 | /// Delete columns in constraint |
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38 | virtual void deleteSome(int numberToDelete, const int * which) ; |
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39 | /// Scale constraint |
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40 | virtual void reallyScale(const double * columnScale) ; |
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41 | /** Given a zeroed array sets nonquadratic columns to 1. |
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42 | Returns number of nonquadratic columns |
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43 | */ |
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44 | virtual int markNonlinear(char * which) const ; |
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45 | /** Given a zeroed array sets possible nonzero coefficients to 1. |
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46 | Returns number of nonzeros |
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47 | */ |
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48 | virtual int markNonzero(char * which) const; |
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49 | //@} |
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50 | |
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51 | |
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52 | ///@name Constructors and destructors |
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53 | //@{ |
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54 | /// Default Constructor |
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55 | ClpConstraintQuadratic(); |
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56 | |
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57 | /// Constructor from quadratic |
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58 | ClpConstraintQuadratic(int row, int numberQuadraticColumns, int numberColumns, |
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59 | const CoinBigIndex * start, |
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60 | const int * column, const double * element); |
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61 | |
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62 | /** Copy constructor . |
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63 | */ |
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64 | ClpConstraintQuadratic(const ClpConstraintQuadratic & rhs); |
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65 | |
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66 | /// Assignment operator |
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67 | ClpConstraintQuadratic & operator=(const ClpConstraintQuadratic& rhs); |
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68 | |
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69 | /// Destructor |
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70 | virtual ~ClpConstraintQuadratic (); |
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71 | |
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72 | /// Clone |
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73 | virtual ClpConstraint * clone() const; |
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74 | //@} |
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75 | ///@name Gets and sets |
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76 | //@{ |
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77 | /// Number of coefficients |
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78 | virtual int numberCoefficients() const; |
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79 | /// Number of columns in constraint |
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80 | inline int numberColumns() const |
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81 | {return numberColumns_;}; |
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82 | /// Column starts |
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83 | inline CoinBigIndex * start() const |
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84 | { return start_;} |
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85 | /// Columns |
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86 | inline const int * column() const |
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87 | { return column_;}; |
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88 | /// Coefficients |
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89 | inline const double * coefficient() const |
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90 | { return coefficient_;}; |
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91 | //@} |
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92 | |
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93 | //--------------------------------------------------------------------------- |
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94 | |
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95 | private: |
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96 | ///@name Private member data |
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97 | /// Column starts |
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98 | CoinBigIndex * start_; |
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99 | /// Column (if -1 then linear coefficient) |
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100 | int * column_; |
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101 | /// Coefficients |
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102 | double * coefficient_; |
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103 | /// Useful to have number of columns about |
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104 | int numberColumns_; |
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105 | /// Number of coefficients in gradient |
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106 | int numberCoefficients_; |
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107 | /// Number of quadratic columns |
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108 | int numberQuadraticColumns_; |
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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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