1 | /* -*- mode: C++; indent-tabs-mode: nil; -*- |
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2 | * |
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3 | * This file is a part of LEMON, a generic C++ optimization library. |
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4 | * |
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5 | * Copyright (C) 2003-2008 |
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6 | * Egervary Jeno Kombinatorikus Optimalizalasi Kutatocsoport |
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7 | * (Egervary Research Group on Combinatorial Optimization, EGRES). |
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8 | * |
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9 | * Permission to use, modify and distribute this software is granted |
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10 | * provided that this copyright notice appears in all copies. For |
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11 | * precise terms see the accompanying LICENSE file. |
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12 | * |
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13 | * This software is provided "AS IS" with no warranty of any kind, |
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14 | * express or implied, and with no claim as to its suitability for any |
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15 | * purpose. |
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16 | * |
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17 | */ |
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18 | |
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19 | ///\file |
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20 | ///\brief Implementation of the LEMON-GLPK lp solver interface. |
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21 | |
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22 | #include <lemon/lp_glpk.h> |
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23 | //#include <iostream> |
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24 | |
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25 | extern "C" { |
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26 | #include <glpk.h> |
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27 | } |
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28 | |
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29 | #if GLP_MAJOR_VERSION > 4 || (GLP_MAJOR_VERSION == 4 && GLP_MINOR_VERSION > 15) |
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30 | #define LEMON_glp(func) (glp_##func) |
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31 | #define LEMON_lpx(func) (lpx_##func) |
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32 | |
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33 | #define LEMON_GLP(def) (GLP_##def) |
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34 | #define LEMON_LPX(def) (LPX_##def) |
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35 | |
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36 | #else |
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37 | |
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38 | #define LEMON_glp(func) (lpx_##func) |
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39 | #define LEMON_lpx(func) (lpx_##func) |
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40 | |
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41 | #define LEMON_GLP(def) (LPX_##def) |
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42 | #define LEMON_LPX(def) (LPX_##def) |
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43 | |
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44 | #endif |
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45 | |
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46 | namespace lemon { |
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47 | |
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48 | LpGlpk::LpGlpk() : Parent() { |
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49 | solved = false; |
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50 | rows = _lp_bits::LpId(1); |
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51 | cols = _lp_bits::LpId(1); |
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52 | lp = LEMON_glp(create_prob)(); |
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53 | LEMON_glp(create_index)(lp); |
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54 | messageLevel(0); |
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55 | } |
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56 | |
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57 | LpGlpk::LpGlpk(const LpGlpk &glp) : Parent() { |
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58 | solved = false; |
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59 | rows = _lp_bits::LpId(1); |
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60 | cols = _lp_bits::LpId(1); |
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61 | lp = LEMON_glp(create_prob)(); |
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62 | LEMON_glp(create_index)(lp); |
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63 | messageLevel(0); |
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64 | //Coefficient matrix, row bounds |
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65 | LEMON_glp(add_rows)(lp, LEMON_glp(get_num_rows)(glp.lp)); |
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66 | LEMON_glp(add_cols)(lp, LEMON_glp(get_num_cols)(glp.lp)); |
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67 | int len; |
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68 | std::vector<int> ind(1+LEMON_glp(get_num_cols)(glp.lp)); |
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69 | std::vector<Value> val(1+LEMON_glp(get_num_cols)(glp.lp)); |
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70 | for (int i=1;i<=LEMON_glp(get_num_rows)(glp.lp);++i) |
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71 | { |
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72 | len=LEMON_glp(get_mat_row)(glp.lp,i,&*ind.begin(),&*val.begin()); |
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73 | LEMON_glp(set_mat_row)(lp, i,len,&*ind.begin(),&*val.begin()); |
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74 | LEMON_glp(set_row_bnds)(lp,i, |
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75 | LEMON_glp(get_row_type)(glp.lp,i), |
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76 | LEMON_glp(get_row_lb)(glp.lp,i), |
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77 | LEMON_glp(get_row_ub)(glp.lp,i)); |
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78 | } |
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79 | |
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80 | //Objective function, coloumn bounds |
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81 | LEMON_glp(set_obj_dir)(lp, LEMON_glp(get_obj_dir)(glp.lp)); |
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82 | //Objectif function's constant term treated separately |
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83 | LEMON_glp(set_obj_coef)(lp,0,LEMON_glp(get_obj_coef)(glp.lp,0)); |
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84 | for (int i=1;i<=LEMON_glp(get_num_cols)(glp.lp);++i) |
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85 | { |
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86 | LEMON_glp(set_obj_coef)(lp,i, |
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87 | LEMON_glp(get_obj_coef)(glp.lp,i)); |
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88 | LEMON_glp(set_col_bnds)(lp,i, |
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89 | LEMON_glp(get_col_type)(glp.lp,i), |
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90 | LEMON_glp(get_col_lb)(glp.lp,i), |
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91 | LEMON_glp(get_col_ub)(glp.lp,i)); |
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92 | } |
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93 | rows = glp.rows; |
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94 | cols = glp.cols; |
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95 | } |
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96 | |
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97 | LpGlpk::~LpGlpk() { |
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98 | LEMON_glp(delete_prob)(lp); |
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99 | } |
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100 | |
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101 | int LpGlpk::_addCol() { |
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102 | int i=LEMON_glp(add_cols)(lp, 1); |
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103 | LEMON_glp(set_col_bnds)(lp, i, LEMON_GLP(FR), 0.0, 0.0); |
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104 | solved = false; |
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105 | return i; |
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106 | } |
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107 | |
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108 | ///\e |
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109 | |
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110 | |
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111 | LpSolverBase* LpGlpk::_newLp() |
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112 | { |
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113 | LpGlpk* newlp = new LpGlpk; |
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114 | return newlp; |
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115 | } |
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116 | |
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117 | ///\e |
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118 | |
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119 | LpSolverBase* LpGlpk::_copyLp() |
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120 | { |
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121 | LpGlpk *newlp = new LpGlpk(*this); |
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122 | return newlp; |
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123 | } |
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124 | |
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125 | int LpGlpk::_addRow() { |
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126 | int i=LEMON_glp(add_rows)(lp, 1); |
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127 | solved = false; |
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128 | return i; |
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129 | } |
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130 | |
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131 | |
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132 | void LpGlpk::_eraseCol(int i) { |
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133 | int ca[2]; |
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134 | ca[1]=i; |
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135 | LEMON_glp(del_cols)(lp, 1, ca); |
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136 | solved = false; |
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137 | } |
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138 | |
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139 | void LpGlpk::_eraseRow(int i) { |
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140 | int ra[2]; |
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141 | ra[1]=i; |
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142 | LEMON_glp(del_rows)(lp, 1, ra); |
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143 | solved = false; |
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144 | } |
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145 | |
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146 | void LpGlpk::_getColName(int c, std::string & name) const |
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147 | { |
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148 | |
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149 | const char *n = LEMON_glp(get_col_name)(lp,c); |
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150 | name = n?n:""; |
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151 | } |
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152 | |
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153 | |
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154 | void LpGlpk::_setColName(int c, const std::string & name) |
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155 | { |
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156 | LEMON_glp(set_col_name)(lp,c,const_cast<char*>(name.c_str())); |
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157 | |
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158 | } |
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159 | |
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160 | int LpGlpk::_colByName(const std::string& name) const |
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161 | { |
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162 | int k = LEMON_glp(find_col)(lp, const_cast<char*>(name.c_str())); |
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163 | return k > 0 ? k : -1; |
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164 | } |
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165 | |
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166 | |
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167 | void LpGlpk::_setRowCoeffs(int i, ConstRowIterator b, ConstRowIterator e) |
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168 | { |
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169 | std::vector<int> indices; |
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170 | std::vector<Value> values; |
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171 | |
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172 | indices.push_back(0); |
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173 | values.push_back(0); |
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174 | |
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175 | for(ConstRowIterator it=b; it!=e; ++it) { |
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176 | indices.push_back(it->first); |
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177 | values.push_back(it->second); |
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178 | } |
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179 | |
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180 | LEMON_glp(set_mat_row)(lp, i, values.size() - 1, |
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181 | &indices[0], &values[0]); |
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182 | |
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183 | solved = false; |
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184 | } |
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185 | |
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186 | void LpGlpk::_getRowCoeffs(int ix, RowIterator b) const |
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187 | { |
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188 | int length = LEMON_glp(get_mat_row)(lp, ix, 0, 0); |
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189 | |
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190 | std::vector<int> indices(length + 1); |
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191 | std::vector<Value> values(length + 1); |
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192 | |
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193 | LEMON_glp(get_mat_row)(lp, ix, &indices[0], &values[0]); |
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194 | |
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195 | for (int i = 1; i <= length; ++i) { |
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196 | *b = std::make_pair(indices[i], values[i]); |
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197 | ++b; |
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198 | } |
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199 | } |
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200 | |
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201 | void LpGlpk::_setColCoeffs(int ix, ConstColIterator b, ConstColIterator e) { |
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202 | |
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203 | std::vector<int> indices; |
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204 | std::vector<Value> values; |
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205 | |
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206 | indices.push_back(0); |
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207 | values.push_back(0); |
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208 | |
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209 | for(ConstColIterator it=b; it!=e; ++it) { |
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210 | indices.push_back(it->first); |
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211 | values.push_back(it->second); |
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212 | } |
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213 | |
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214 | LEMON_glp(set_mat_col)(lp, ix, values.size() - 1, |
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215 | &indices[0], &values[0]); |
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216 | |
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217 | solved = false; |
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218 | } |
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219 | |
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220 | void LpGlpk::_getColCoeffs(int ix, ColIterator b) const |
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221 | { |
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222 | int length = LEMON_glp(get_mat_col)(lp, ix, 0, 0); |
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223 | |
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224 | std::vector<int> indices(length + 1); |
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225 | std::vector<Value> values(length + 1); |
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226 | |
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227 | LEMON_glp(get_mat_col)(lp, ix, &indices[0], &values[0]); |
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228 | |
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229 | for (int i = 1; i <= length; ++i) { |
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230 | *b = std::make_pair(indices[i], values[i]); |
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231 | ++b; |
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232 | } |
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233 | } |
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234 | |
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235 | void LpGlpk::_setCoeff(int ix, int jx, Value value) |
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236 | { |
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237 | |
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238 | if (LEMON_glp(get_num_cols)(lp) < LEMON_glp(get_num_rows)(lp)) { |
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239 | |
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240 | int length=LEMON_glp(get_mat_row)(lp, ix, 0, 0); |
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241 | |
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242 | std::vector<int> indices(length + 2); |
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243 | std::vector<Value> values(length + 2); |
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244 | |
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245 | LEMON_glp(get_mat_row)(lp, ix, &indices[0], &values[0]); |
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246 | |
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247 | //The following code does not suppose that the elements of the |
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248 | //array indices are sorted |
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249 | bool found=false; |
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250 | for (int i = 1; i <= length; ++i) { |
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251 | if (indices[i]==jx){ |
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252 | found=true; |
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253 | values[i]=value; |
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254 | break; |
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255 | } |
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256 | } |
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257 | if (!found){ |
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258 | ++length; |
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259 | indices[length]=jx; |
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260 | values[length]=value; |
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261 | } |
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262 | |
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263 | LEMON_glp(set_mat_row)(lp, ix, length, &indices[0], &values[0]); |
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264 | |
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265 | } else { |
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266 | |
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267 | int length=LEMON_glp(get_mat_col)(lp, jx, 0, 0); |
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268 | |
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269 | std::vector<int> indices(length + 2); |
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270 | std::vector<Value> values(length + 2); |
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271 | |
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272 | LEMON_glp(get_mat_col)(lp, jx, &indices[0], &values[0]); |
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273 | |
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274 | //The following code does not suppose that the elements of the |
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275 | //array indices are sorted |
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276 | bool found=false; |
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277 | for (int i = 1; i <= length; ++i) { |
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278 | if (indices[i]==ix){ |
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279 | found=true; |
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280 | values[i]=value; |
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281 | break; |
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282 | } |
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283 | } |
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284 | if (!found){ |
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285 | ++length; |
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286 | indices[length]=ix; |
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287 | values[length]=value; |
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288 | } |
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289 | |
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290 | LEMON_glp(set_mat_col)(lp, jx, length, &indices[0], &values[0]); |
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291 | } |
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292 | |
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293 | solved = false; |
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294 | } |
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295 | |
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296 | LpGlpk::Value LpGlpk::_getCoeff(int ix, int jx) const |
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297 | { |
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298 | |
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299 | int length=LEMON_glp(get_mat_row)(lp, ix, 0, 0); |
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300 | |
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301 | std::vector<int> indices(length + 1); |
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302 | std::vector<Value> values(length + 1); |
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303 | |
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304 | LEMON_glp(get_mat_row)(lp, ix, &indices[0], &values[0]); |
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305 | |
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306 | //The following code does not suppose that the elements of the |
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307 | //array indices are sorted |
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308 | for (int i = 1; i <= length; ++i) { |
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309 | if (indices[i]==jx){ |
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310 | return values[i]; |
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311 | } |
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312 | } |
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313 | return 0; |
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314 | |
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315 | } |
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316 | |
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317 | |
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318 | void LpGlpk::_setColLowerBound(int i, Value lo) |
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319 | { |
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320 | if (lo==INF) { |
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321 | //FIXME error |
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322 | } |
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323 | int b=LEMON_glp(get_col_type)(lp, i); |
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324 | double up=LEMON_glp(get_col_ub)(lp, i); |
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325 | if (lo==-INF) { |
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326 | switch (b) { |
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327 | case LEMON_GLP(FR): |
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328 | case LEMON_GLP(LO): |
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329 | LEMON_glp(set_col_bnds)(lp, i, LEMON_GLP(FR), lo, up); |
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330 | break; |
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331 | case LEMON_GLP(UP): |
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332 | break; |
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333 | case LEMON_GLP(DB): |
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334 | case LEMON_GLP(FX): |
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335 | LEMON_glp(set_col_bnds)(lp, i, LEMON_GLP(UP), lo, up); |
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336 | break; |
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337 | default: ; |
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338 | //FIXME error |
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339 | } |
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340 | } else { |
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341 | switch (b) { |
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342 | case LEMON_GLP(FR): |
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343 | case LEMON_GLP(LO): |
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344 | LEMON_glp(set_col_bnds)(lp, i, LEMON_GLP(LO), lo, up); |
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345 | break; |
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346 | case LEMON_GLP(UP): |
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347 | case LEMON_GLP(DB): |
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348 | case LEMON_GLP(FX): |
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349 | if (lo==up) |
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350 | LEMON_glp(set_col_bnds)(lp, i, LEMON_GLP(FX), lo, up); |
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351 | else |
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352 | LEMON_glp(set_col_bnds)(lp, i, LEMON_GLP(DB), lo, up); |
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353 | break; |
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354 | default: ; |
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355 | //FIXME error |
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356 | } |
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357 | } |
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358 | |
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359 | solved = false; |
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360 | } |
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361 | |
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362 | LpGlpk::Value LpGlpk::_getColLowerBound(int i) const |
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363 | { |
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364 | int b=LEMON_glp(get_col_type)(lp, i); |
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365 | switch (b) { |
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366 | case LEMON_GLP(LO): |
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367 | case LEMON_GLP(DB): |
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368 | case LEMON_GLP(FX): |
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369 | return LEMON_glp(get_col_lb)(lp, i); |
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370 | default: ; |
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371 | return -INF; |
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372 | } |
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373 | } |
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374 | |
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375 | void LpGlpk::_setColUpperBound(int i, Value up) |
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376 | { |
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377 | if (up==-INF) { |
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378 | //FIXME error |
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379 | } |
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380 | int b=LEMON_glp(get_col_type)(lp, i); |
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381 | double lo=LEMON_glp(get_col_lb)(lp, i); |
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382 | if (up==INF) { |
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383 | switch (b) { |
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384 | case LEMON_GLP(FR): |
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385 | case LEMON_GLP(LO): |
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386 | break; |
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387 | case LEMON_GLP(UP): |
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388 | LEMON_glp(set_col_bnds)(lp, i, LEMON_GLP(FR), lo, up); |
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389 | break; |
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390 | case LEMON_GLP(DB): |
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391 | case LEMON_GLP(FX): |
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392 | LEMON_glp(set_col_bnds)(lp, i, LEMON_GLP(LO), lo, up); |
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393 | break; |
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394 | default: ; |
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395 | //FIXME error |
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396 | } |
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397 | } else { |
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398 | switch (b) { |
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399 | case LEMON_GLP(FR): |
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400 | LEMON_glp(set_col_bnds)(lp, i, LEMON_GLP(UP), lo, up); |
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401 | break; |
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402 | case LEMON_GLP(UP): |
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403 | LEMON_glp(set_col_bnds)(lp, i, LEMON_GLP(UP), lo, up); |
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404 | break; |
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405 | case LEMON_GLP(LO): |
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406 | case LEMON_GLP(DB): |
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407 | case LEMON_GLP(FX): |
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408 | if (lo==up) |
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409 | LEMON_glp(set_col_bnds)(lp, i, LEMON_GLP(FX), lo, up); |
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410 | else |
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411 | LEMON_glp(set_col_bnds)(lp, i, LEMON_GLP(DB), lo, up); |
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412 | break; |
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413 | default: ; |
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414 | //FIXME error |
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415 | } |
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416 | } |
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417 | |
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418 | solved = false; |
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419 | } |
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420 | |
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421 | LpGlpk::Value LpGlpk::_getColUpperBound(int i) const |
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422 | { |
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423 | int b=LEMON_glp(get_col_type)(lp, i); |
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424 | switch (b) { |
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425 | case LEMON_GLP(UP): |
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426 | case LEMON_GLP(DB): |
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427 | case LEMON_GLP(FX): |
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428 | return LEMON_glp(get_col_ub)(lp, i); |
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429 | default: ; |
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430 | return INF; |
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431 | } |
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432 | } |
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433 | |
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434 | void LpGlpk::_setRowBounds(int i, Value lb, Value ub) |
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435 | { |
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436 | //Bad parameter |
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437 | if (lb==INF || ub==-INF) { |
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438 | //FIXME error |
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439 | } |
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440 | |
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441 | if (lb == -INF){ |
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442 | if (ub == INF){ |
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443 | LEMON_glp(set_row_bnds)(lp, i, LEMON_GLP(FR), lb, ub); |
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444 | } |
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445 | else{ |
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446 | LEMON_glp(set_row_bnds)(lp, i, LEMON_GLP(UP), lb, ub); |
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447 | } |
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448 | } |
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449 | else{ |
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450 | if (ub==INF){ |
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451 | LEMON_glp(set_row_bnds)(lp, i, LEMON_GLP(LO), lb, ub); |
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452 | |
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453 | } |
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454 | else{ |
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455 | if (lb == ub){ |
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456 | LEMON_glp(set_row_bnds)(lp, i, LEMON_GLP(FX), lb, ub); |
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457 | } |
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458 | else{ |
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459 | LEMON_glp(set_row_bnds)(lp, i, LEMON_GLP(DB), lb, ub); |
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460 | } |
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461 | } |
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462 | } |
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463 | |
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464 | solved = false; |
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465 | } |
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466 | |
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467 | void LpGlpk::_getRowBounds(int i, Value &lb, Value &ub) const |
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468 | { |
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469 | |
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470 | int b=LEMON_glp(get_row_type)(lp, i); |
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471 | switch (b) { |
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472 | case LEMON_GLP(FR): |
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473 | case LEMON_GLP(UP): |
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474 | lb = -INF; |
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475 | break; |
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476 | default: |
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477 | lb=LEMON_glp(get_row_lb)(lp, i); |
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478 | } |
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479 | |
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480 | switch (b) { |
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481 | case LEMON_GLP(FR): |
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482 | case LEMON_GLP(LO): |
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483 | ub = INF; |
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484 | break; |
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485 | default: |
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486 | ub=LEMON_glp(get_row_ub)(lp, i); |
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487 | } |
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488 | |
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489 | } |
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490 | |
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491 | void LpGlpk::_setObjCoeff(int i, Value obj_coef) |
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492 | { |
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493 | //i=0 means the constant term (shift) |
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494 | LEMON_glp(set_obj_coef)(lp, i, obj_coef); |
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495 | |
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496 | solved = false; |
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497 | } |
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498 | |
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499 | LpGlpk::Value LpGlpk::_getObjCoeff(int i) const { |
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500 | //i=0 means the constant term (shift) |
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501 | return LEMON_glp(get_obj_coef)(lp, i); |
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502 | } |
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503 | |
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504 | void LpGlpk::_clearObj() |
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505 | { |
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506 | for (int i=0;i<=LEMON_glp(get_num_cols)(lp);++i){ |
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507 | LEMON_glp(set_obj_coef)(lp, i, 0); |
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508 | } |
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509 | |
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510 | solved = false; |
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511 | } |
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512 | |
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513 | LpGlpk::SolveExitStatus LpGlpk::_solve() |
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514 | { |
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515 | // A way to check the problem to be solved |
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516 | //LEMON_glp(write_cpxlp(lp,"naittvan.cpx"); |
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517 | |
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518 | LEMON_lpx(std_basis)(lp); |
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519 | int i = LEMON_lpx(simplex)(lp); |
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520 | |
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521 | switch (i) { |
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522 | case LEMON_LPX(E_OK): |
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523 | solved = true; |
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524 | return SOLVED; |
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525 | default: |
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526 | return UNSOLVED; |
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527 | } |
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528 | } |
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529 | |
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530 | LpGlpk::Value LpGlpk::_getPrimal(int i) const |
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531 | { |
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532 | return LEMON_glp(get_col_prim)(lp,i); |
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533 | } |
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534 | |
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535 | LpGlpk::Value LpGlpk::_getDual(int i) const |
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536 | { |
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537 | return LEMON_glp(get_row_dual)(lp,i); |
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538 | } |
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539 | |
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540 | LpGlpk::Value LpGlpk::_getPrimalValue() const |
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541 | { |
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542 | return LEMON_glp(get_obj_val)(lp); |
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543 | } |
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544 | bool LpGlpk::_isBasicCol(int i) const |
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545 | { |
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546 | return (LEMON_glp(get_col_stat)(lp, i)==LEMON_GLP(BS)); |
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547 | } |
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548 | |
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549 | |
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550 | LpGlpk::SolutionStatus LpGlpk::_getPrimalStatus() const |
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551 | { |
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552 | if (!solved) return UNDEFINED; |
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553 | int stat= LEMON_lpx(get_status)(lp); |
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554 | switch (stat) { |
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555 | case LEMON_LPX(UNDEF)://Undefined (no solve has been run yet) |
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556 | return UNDEFINED; |
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557 | case LEMON_LPX(NOFEAS)://There is no feasible solution (primal, I guess) |
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558 | case LEMON_LPX(INFEAS)://Infeasible |
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559 | return INFEASIBLE; |
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560 | case LEMON_LPX(UNBND)://Unbounded |
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561 | return INFINITE; |
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562 | case LEMON_LPX(FEAS)://Feasible |
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563 | return FEASIBLE; |
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564 | case LEMON_LPX(OPT)://Feasible |
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565 | return OPTIMAL; |
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566 | default: |
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567 | return UNDEFINED; //to avoid gcc warning |
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568 | //FIXME error |
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569 | } |
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570 | } |
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571 | |
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572 | LpGlpk::SolutionStatus LpGlpk::_getDualStatus() const |
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573 | { |
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574 | if (!solved) return UNDEFINED; |
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575 | switch (LEMON_lpx(get_dual_stat)(lp)) { |
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576 | case LEMON_LPX(D_UNDEF)://Undefined (no solve has been run yet) |
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577 | return UNDEFINED; |
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578 | case LEMON_LPX(D_NOFEAS)://There is no dual feasible solution |
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579 | // case LEMON_LPX(D_INFEAS://Infeasible |
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580 | return INFEASIBLE; |
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581 | case LEMON_LPX(D_FEAS)://Feasible |
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582 | switch (LEMON_lpx(get_status)(lp)) { |
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583 | case LEMON_LPX(NOFEAS): |
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584 | return INFINITE; |
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585 | case LEMON_LPX(OPT): |
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586 | return OPTIMAL; |
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587 | default: |
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588 | return FEASIBLE; |
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589 | } |
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590 | default: |
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591 | return UNDEFINED; //to avoid gcc warning |
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592 | //FIXME error |
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593 | } |
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594 | } |
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595 | |
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596 | LpGlpk::ProblemTypes LpGlpk::_getProblemType() const |
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597 | { |
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598 | if (!solved) return UNKNOWN; |
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599 | //int stat= LEMON_glp(get_status(lp); |
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600 | int statp= LEMON_lpx(get_prim_stat)(lp); |
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601 | int statd= LEMON_lpx(get_dual_stat)(lp); |
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602 | if (statp==LEMON_LPX(P_FEAS) && statd==LEMON_LPX(D_FEAS)) |
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603 | return PRIMAL_DUAL_FEASIBLE; |
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604 | if (statp==LEMON_LPX(P_FEAS) && statd==LEMON_LPX(D_NOFEAS)) |
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605 | return PRIMAL_FEASIBLE_DUAL_INFEASIBLE; |
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606 | if (statp==LEMON_LPX(P_NOFEAS) && statd==LEMON_LPX(D_FEAS)) |
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607 | return PRIMAL_INFEASIBLE_DUAL_FEASIBLE; |
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608 | if (statp==LEMON_LPX(P_NOFEAS) && statd==LEMON_LPX(D_NOFEAS)) |
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609 | return PRIMAL_DUAL_INFEASIBLE; |
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610 | //In all other cases |
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611 | return UNKNOWN; |
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612 | } |
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613 | |
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614 | void LpGlpk::_setMax() |
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615 | { |
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616 | solved = false; |
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617 | LEMON_glp(set_obj_dir)(lp, LEMON_GLP(MAX)); |
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618 | } |
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619 | |
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620 | void LpGlpk::_setMin() |
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621 | { |
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622 | solved = false; |
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623 | LEMON_glp(set_obj_dir)(lp, LEMON_GLP(MIN)); |
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624 | } |
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625 | |
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626 | bool LpGlpk::_isMax() const |
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627 | { |
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628 | return (LEMON_glp(get_obj_dir)(lp)==LEMON_GLP(MAX)); |
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629 | } |
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630 | |
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631 | |
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632 | |
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633 | void LpGlpk::messageLevel(int m) |
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634 | { |
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635 | LEMON_lpx(set_int_parm)(lp, LEMON_LPX(K_MSGLEV), m); |
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636 | } |
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637 | |
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638 | void LpGlpk::presolver(bool b) |
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639 | { |
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640 | LEMON_lpx(set_int_parm)(lp, LEMON_LPX(K_PRESOL), b); |
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641 | } |
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642 | |
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643 | |
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644 | } //END OF NAMESPACE LEMON |
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