1 | // $Id$ |
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2 | // Copyright (C) 2002, 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 | // Edwin 11/24/09 carved from CbcNode |
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7 | |
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8 | #if defined(_MSC_VER) |
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9 | // Turn off compiler warning about long names |
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10 | # pragma warning(disable:4786) |
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11 | #endif |
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12 | |
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13 | #include "CbcConfig.h" |
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14 | |
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15 | #include <string> |
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16 | //#define CBC_DEBUG 1 |
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17 | //#define CHECK_CUT_COUNTS |
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18 | //#define CHECK_NODE |
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19 | //#define CBC_CHECK_BASIS |
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20 | #include <cassert> |
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21 | #include <cfloat> |
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22 | #define CUTS |
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23 | #include "OsiSolverInterface.hpp" |
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24 | #include "OsiChooseVariable.hpp" |
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25 | #include "OsiAuxInfo.hpp" |
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26 | #include "OsiSolverBranch.hpp" |
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27 | #include "CoinWarmStartBasis.hpp" |
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28 | #include "CoinTime.hpp" |
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29 | #include "CbcModel.hpp" |
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30 | #include "CbcNode.hpp" |
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31 | #include "CbcStatistics.hpp" |
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32 | #include "CbcStrategy.hpp" |
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33 | #include "CbcBranchActual.hpp" |
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34 | #include "CbcBranchDynamic.hpp" |
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35 | #include "OsiRowCut.hpp" |
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36 | #include "OsiRowCutDebugger.hpp" |
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37 | #include "OsiCuts.hpp" |
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38 | #include "CbcCountRowCut.hpp" |
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39 | #include "CbcFeasibilityBase.hpp" |
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40 | #include "CbcMessage.hpp" |
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41 | #ifdef COIN_HAS_CLP |
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42 | #include "OsiClpSolverInterface.hpp" |
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43 | #include "ClpSimplexOther.hpp" |
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44 | #endif |
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45 | using namespace std; |
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46 | #include "CglCutGenerator.hpp" |
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47 | |
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48 | CbcFullNodeInfo::CbcFullNodeInfo() : |
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49 | CbcNodeInfo(), |
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50 | basis_(), |
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51 | numberIntegers_(0), |
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52 | lower_(NULL), |
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53 | upper_(NULL) |
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54 | { |
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55 | } |
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56 | CbcFullNodeInfo::CbcFullNodeInfo(CbcModel * model, |
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57 | int numberRowsAtContinuous) : |
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58 | CbcNodeInfo(NULL, model->currentNode()) |
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59 | { |
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60 | OsiSolverInterface * solver = model->solver(); |
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61 | numberRows_ = numberRowsAtContinuous; |
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62 | numberIntegers_ = model->numberIntegers(); |
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63 | int numberColumns = model->getNumCols(); |
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64 | lower_ = new double [numberColumns]; |
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65 | upper_ = new double [numberColumns]; |
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66 | const double * lower = solver->getColLower(); |
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67 | const double * upper = solver->getColUpper(); |
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68 | int i; |
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69 | |
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70 | for (i = 0; i < numberColumns; i++) { |
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71 | lower_[i] = lower[i]; |
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72 | upper_[i] = upper[i]; |
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73 | } |
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74 | |
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75 | basis_ = dynamic_cast<CoinWarmStartBasis*>(solver->getWarmStart()); |
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76 | } |
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77 | |
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78 | CbcFullNodeInfo::CbcFullNodeInfo(const CbcFullNodeInfo & rhs) : |
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79 | CbcNodeInfo(rhs) |
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80 | { |
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81 | basis_ = dynamic_cast<CoinWarmStartBasis *>(rhs.basis_->clone()) ; |
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82 | numberIntegers_ = rhs.numberIntegers_; |
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83 | lower_ = NULL; |
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84 | upper_ = NULL; |
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85 | if (rhs.lower_ != NULL) { |
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86 | int numberColumns = basis_->getNumStructural(); |
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87 | lower_ = new double [numberColumns]; |
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88 | upper_ = new double [numberColumns]; |
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89 | assert (upper_ != NULL); |
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90 | memcpy(lower_, rhs.lower_, numberColumns*sizeof(double)); |
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91 | memcpy(upper_, rhs.upper_, numberColumns*sizeof(double)); |
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92 | } |
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93 | } |
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94 | |
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95 | CbcNodeInfo * |
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96 | CbcFullNodeInfo::clone() const |
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97 | { |
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98 | return (new CbcFullNodeInfo(*this)); |
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99 | } |
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100 | |
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101 | CbcFullNodeInfo::~CbcFullNodeInfo () |
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102 | { |
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103 | delete basis_ ; |
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104 | delete [] lower_; |
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105 | delete [] upper_; |
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106 | } |
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107 | |
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108 | /* |
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109 | The basis supplied as a parameter is deleted and replaced with a new basis |
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110 | appropriate for the node, and lower and upper bounds on variables are |
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111 | reset according to the stored bounds arrays. Any cuts associated with this |
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112 | node are added to the list in addCuts, but not actually added to the |
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113 | constraint system in the model. |
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114 | |
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115 | Why pass in a basis at all? The short answer is ``We need the parameter to |
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116 | pass out a basis, so might as well use it to pass in the size.'' |
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117 | |
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118 | A longer answer is that in practice we take a memory allocation hit up in |
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119 | addCuts1 (the only place applyToModel is called) when we setSize() the |
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120 | basis that's passed in. It's immediately tossed here in favour of a clone |
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121 | of the basis attached to this nodeInfo. This can probably be fixed, given |
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122 | a bit of thought. |
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123 | */ |
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124 | |
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125 | void CbcFullNodeInfo::applyToModel (CbcModel *model, |
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126 | CoinWarmStartBasis *&basis, |
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127 | CbcCountRowCut **addCuts, |
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128 | int ¤tNumberCuts) const |
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129 | |
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130 | { |
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131 | OsiSolverInterface *solver = model->solver() ; |
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132 | |
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133 | // branch - do bounds |
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134 | assert (active_ == 7 || active_ == 15); |
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135 | int i; |
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136 | solver->setColLower(lower_); |
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137 | solver->setColUpper(upper_); |
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138 | int numberColumns = model->getNumCols(); |
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139 | // move basis - but make sure size stays |
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140 | // for bon-min - should not be needed int numberRows = model->getNumRows(); |
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141 | int numberRows = basis->getNumArtificial(); |
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142 | delete basis ; |
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143 | if (basis_) { |
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144 | basis = dynamic_cast<CoinWarmStartBasis *>(basis_->clone()) ; |
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145 | basis->resize(numberRows, numberColumns); |
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146 | #ifdef CBC_CHECK_BASIS |
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147 | std::cout << "Basis (after applying root " << this << ") " << std::endl ; |
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148 | basis->print() ; |
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149 | #endif |
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150 | } else { |
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151 | // We have a solver without a basis |
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152 | basis = NULL; |
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153 | } |
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154 | for (i = 0; i < numberCuts_; i++) |
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155 | addCuts[currentNumberCuts+i] = cuts_[i]; |
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156 | currentNumberCuts += numberCuts_; |
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157 | assert(!parent_); |
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158 | return ; |
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159 | } |
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160 | // Just apply bounds to one variable (1=>infeasible) |
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161 | int |
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162 | CbcFullNodeInfo::applyBounds(int iColumn, double & lower, double & upper, int force) |
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163 | { |
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164 | if ((force && 1) == 0) { |
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165 | if (lower > lower_[iColumn]) |
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166 | COIN_DETAIL_PRINT(printf("%d odd lower going from %g to %g\n", iColumn, lower, lower_[iColumn])); |
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167 | lower = lower_[iColumn]; |
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168 | } else { |
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169 | lower_[iColumn] = lower; |
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170 | } |
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171 | if ((force && 2) == 0) { |
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172 | if (upper < upper_[iColumn]) |
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173 | COIN_DETAIL_PRINT(printf("%d odd upper going from %g to %g\n", iColumn, upper, upper_[iColumn])); |
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174 | upper = upper_[iColumn]; |
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175 | } else { |
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176 | upper_[iColumn] = upper; |
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177 | } |
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178 | return (upper_[iColumn] >= lower_[iColumn]) ? 0 : 1; |
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179 | } |
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180 | |
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181 | /* Builds up row basis backwards (until original model). |
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182 | Returns NULL or previous one to apply . |
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183 | Depends on Free being 0 and impossible for cuts |
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184 | */ |
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185 | CbcNodeInfo * |
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186 | CbcFullNodeInfo::buildRowBasis(CoinWarmStartBasis & basis ) const |
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187 | { |
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188 | const unsigned int * saved = |
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189 | reinterpret_cast<const unsigned int *> (basis_->getArtificialStatus()); |
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190 | unsigned int * now = |
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191 | reinterpret_cast<unsigned int *> (basis.getArtificialStatus()); |
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192 | int number = basis_->getNumArtificial() >> 4;; |
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193 | int i; |
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194 | for (i = 0; i < number; i++) { |
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195 | if (!now[i]) |
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196 | now[i] = saved[i]; |
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197 | } |
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198 | return NULL; |
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199 | } |
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200 | |
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