1 | // Copyright (C) 2004, International Business Machines |
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2 | // Corporation and others. All Rights Reserved. |
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3 | #ifndef CbcBranchLotsize_H |
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4 | #define CbcBranchLotsize_H |
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5 | |
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6 | #include "CbcBranchBase.hpp" |
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7 | |
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8 | /** Lotsize class */ |
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9 | |
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10 | |
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11 | class CbcLotsize : public CbcObject { |
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12 | |
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13 | public: |
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14 | |
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15 | // Default Constructor |
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16 | CbcLotsize (); |
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17 | |
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18 | /* Useful constructor - passed model index. |
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19 | Also passed valid values - if range then pairs |
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20 | */ |
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21 | CbcLotsize (CbcModel * model, int iColumn, |
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22 | int numberPoints, const double * points, bool range=false); |
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23 | |
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24 | // Copy constructor |
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25 | CbcLotsize ( const CbcLotsize &); |
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26 | |
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27 | /// Clone |
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28 | virtual CbcObject * clone() const; |
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29 | |
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30 | // Assignment operator |
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31 | CbcLotsize & operator=( const CbcLotsize& rhs); |
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32 | |
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33 | // Destructor |
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34 | ~CbcLotsize (); |
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35 | |
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36 | /// Infeasibility - large is 0.5 |
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37 | virtual double infeasibility(int & preferredWay) const; |
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38 | |
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39 | /** Set bounds to contain the current solution. |
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40 | |
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41 | More precisely, for the variable associated with this object, take the |
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42 | value given in the current solution, force it within the current bounds |
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43 | if required, then set the bounds to fix the variable at the integer |
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44 | nearest the solution value. |
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45 | */ |
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46 | virtual void feasibleRegion(); |
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47 | |
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48 | /// Creates a branching object |
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49 | virtual CbcBranchingObject * createBranch(int way) const; |
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50 | |
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51 | /** \brief Given a valid solution (with reduced costs, etc.), |
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52 | return a branching object which would give a new feasible |
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53 | point in the good direction. |
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54 | |
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55 | The preferred branching object will force the variable to be +/-1 from |
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56 | its current value, depending on the reduced cost and objective sense. If |
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57 | movement in the direction which improves the objective is impossible due |
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58 | to bounds on the variable, the branching object will move in the other |
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59 | direction. If no movement is possible, the method returns NULL. |
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60 | |
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61 | Only the bounds on this variable are considered when determining if the new |
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62 | point is feasible. |
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63 | */ |
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64 | virtual CbcBranchingObject * preferredNewFeasible() const; |
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65 | |
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66 | /** \brief Given a valid solution (with reduced costs, etc.), |
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67 | return a branching object which would give a new feasible |
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68 | point in a bad direction. |
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69 | |
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70 | As for preferredNewFeasible(), but the preferred branching object will |
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71 | force movement in a direction that degrades the objective. |
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72 | */ |
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73 | virtual CbcBranchingObject * notPreferredNewFeasible() const ; |
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74 | |
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75 | /** Reset original upper and lower bound values from the solver. |
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76 | |
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77 | Handy for updating bounds held in this object after bounds held in the |
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78 | solver have been tightened. |
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79 | */ |
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80 | virtual void resetBounds(); |
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81 | |
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82 | /** Finds range of interest so value is feasible in range range_ or infeasible |
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83 | between hi[range_] and lo[range_+1]. Returns true if feasible. |
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84 | */ |
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85 | bool findRange(double value) const; |
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86 | |
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87 | /** Returns floor and ceiling |
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88 | */ |
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89 | virtual void floorCeiling(double & floorLotsize, double & ceilingLotsize, double value, |
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90 | double tolerance) const; |
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91 | |
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92 | /// Model column number |
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93 | inline int modelSequence() const |
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94 | {return columnNumber_;}; |
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95 | |
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96 | /** Column number if single column object -1 otherwise, |
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97 | so returns >= 0 |
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98 | Used by heuristics |
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99 | */ |
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100 | virtual int columnNumber() const; |
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101 | /// Original bounds |
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102 | inline double originalLowerBound() const |
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103 | { return bound_[0];}; |
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104 | inline double originalUpperBound() const |
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105 | { return bound_[rangeType_*numberRanges_-1];}; |
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106 | /// Type - 1 points, 2 ranges |
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107 | inline int rangeType() const |
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108 | { return rangeType_;}; |
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109 | /// Number of points |
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110 | inline int numberRanges() const |
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111 | { return numberRanges_;}; |
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112 | /// Ranges |
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113 | inline double * bound() const |
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114 | { return bound_;}; |
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115 | |
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116 | private: |
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117 | /// Just for debug (CBC_PRINT defined in CbcBranchLotsize.cpp) |
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118 | void printLotsize(double value,bool condition,int type) const; |
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119 | |
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120 | private: |
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121 | /// data |
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122 | |
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123 | /// Column number in model |
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124 | int columnNumber_; |
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125 | /// Type - 1 points, 2 ranges |
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126 | int rangeType_; |
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127 | /// Number of points |
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128 | int numberRanges_; |
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129 | // largest gap |
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130 | double largestGap_; |
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131 | /// Ranges |
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132 | double * bound_; |
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133 | /// Current range |
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134 | mutable int range_; |
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135 | }; |
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136 | |
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137 | |
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138 | /** Lotsize branching object |
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139 | |
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140 | This object can specify a two-way branch on an integer variable. For each |
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141 | arm of the branch, the upper and lower bounds on the variable can be |
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142 | independently specified. |
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143 | |
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144 | Variable_ holds the index of the integer variable in the integerVariable_ |
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145 | array of the model. |
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146 | */ |
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147 | |
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148 | class CbcLotsizeBranchingObject : public CbcBranchingObject { |
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149 | |
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150 | public: |
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151 | |
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152 | /// Default constructor |
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153 | CbcLotsizeBranchingObject (); |
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154 | |
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155 | /** Create a lotsize floor/ceiling branch object |
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156 | |
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157 | Specifies a simple two-way branch. Let \p value = x*. One arm of the |
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158 | branch will be is lb <= x <= valid range below(x*), the other valid range above(x*) <= x <= ub. |
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159 | Specify way = -1 to set the object state to perform the down arm first, |
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160 | way = 1 for the up arm. |
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161 | */ |
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162 | CbcLotsizeBranchingObject (CbcModel *model, int variable, |
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163 | int way , double value,const CbcLotsize * lotsize) ; |
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164 | |
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165 | /** Create a degenerate branch object |
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166 | |
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167 | Specifies a `one-way branch'. Calling branch() for this object will |
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168 | always result in lowerValue <= x <= upperValue. Used to fix in valid range |
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169 | */ |
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170 | |
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171 | CbcLotsizeBranchingObject (CbcModel *model, int variable, int way, |
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172 | double lowerValue, double upperValue) ; |
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173 | |
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174 | /// Copy constructor |
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175 | CbcLotsizeBranchingObject ( const CbcLotsizeBranchingObject &); |
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176 | |
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177 | /// Assignment operator |
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178 | CbcLotsizeBranchingObject & operator= (const CbcLotsizeBranchingObject& rhs); |
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179 | |
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180 | /// Clone |
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181 | virtual CbcBranchingObject * clone() const; |
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182 | |
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183 | /// Destructor |
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184 | virtual ~CbcLotsizeBranchingObject (); |
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185 | |
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186 | /** \brief Sets the bounds for the variable according to the current arm |
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187 | of the branch and advances the object state to the next arm. |
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188 | */ |
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189 | virtual double branch(bool normalBranch=false); |
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190 | |
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191 | /** \brief Print something about branch - only if log level high |
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192 | */ |
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193 | virtual void print(bool normalBranch); |
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194 | |
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195 | private: |
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196 | /// Lower [0] and upper [1] bounds for the down arm (way_ = -1) |
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197 | double down_[2]; |
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198 | /// Lower [0] and upper [1] bounds for the up arm (way_ = 1) |
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199 | double up_[2]; |
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200 | }; |
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201 | |
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202 | |
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203 | #endif |
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