1 | /* -*- C++ -*- |
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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) 2003-2006 |
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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 | #include <sstream> |
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20 | #include <lemon/lp_skeleton.h> |
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21 | #include "test_tools.h" |
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22 | |
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23 | |
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24 | #ifdef HAVE_CONFIG_H |
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25 | #include <config.h> |
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26 | #endif |
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27 | |
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28 | #ifdef HAVE_GLPK |
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29 | #include <lemon/lp_glpk.h> |
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30 | #endif |
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31 | |
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32 | #ifdef HAVE_CPLEX |
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33 | #include <lemon/lp_cplex.h> |
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34 | #endif |
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35 | |
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36 | using namespace lemon; |
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37 | |
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38 | void lpTest(LpSolverBase & lp) |
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39 | { |
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40 | |
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41 | |
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42 | |
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43 | typedef LpSolverBase LP; |
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44 | |
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45 | std::vector<LP::Col> x(10); |
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46 | // for(int i=0;i<10;i++) x.push_back(lp.addCol()); |
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47 | lp.addColSet(x); |
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48 | lp.colLowerBound(x,1); |
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49 | lp.colUpperBound(x,1); |
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50 | lp.colBounds(x,1,2); |
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51 | #ifndef GYORSITAS |
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52 | |
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53 | std::vector<LP::Col> y(10); |
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54 | lp.addColSet(y); |
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55 | |
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56 | lp.colLowerBound(y,1); |
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57 | lp.colUpperBound(y,1); |
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58 | lp.colBounds(y,1,2); |
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59 | |
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60 | std::map<int,LP::Col> z; |
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61 | |
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62 | z.insert(std::make_pair(12,INVALID)); |
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63 | z.insert(std::make_pair(2,INVALID)); |
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64 | z.insert(std::make_pair(7,INVALID)); |
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65 | z.insert(std::make_pair(5,INVALID)); |
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66 | |
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67 | lp.addColSet(z); |
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68 | |
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69 | lp.colLowerBound(z,1); |
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70 | lp.colUpperBound(z,1); |
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71 | lp.colBounds(z,1,2); |
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72 | |
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73 | { |
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74 | LP::Expr e,f,g; |
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75 | LP::Col p1,p2,p3,p4,p5; |
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76 | LP::Constr c; |
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77 | |
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78 | p1=lp.addCol(); |
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79 | p2=lp.addCol(); |
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80 | p3=lp.addCol(); |
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81 | p4=lp.addCol(); |
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82 | p5=lp.addCol(); |
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83 | |
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84 | e[p1]=2; |
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85 | e.constComp()=12; |
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86 | e[p1]+=2; |
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87 | e.constComp()+=12; |
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88 | e[p1]-=2; |
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89 | e.constComp()-=12; |
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90 | |
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91 | e=2; |
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92 | e=2.2; |
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93 | e=p1; |
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94 | e=f; |
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95 | |
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96 | e+=2; |
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97 | e+=2.2; |
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98 | e+=p1; |
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99 | e+=f; |
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100 | |
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101 | e-=2; |
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102 | e-=2.2; |
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103 | e-=p1; |
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104 | e-=f; |
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105 | |
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106 | e*=2; |
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107 | e*=2.2; |
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108 | e/=2; |
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109 | e/=2.2; |
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110 | |
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111 | e=((p1+p2)+(p1-p2)+(p1+12)+(12+p1)+(p1-12)+(12-p1)+ |
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112 | (f+12)+(12+f)+(p1+f)+(f+p1)+(f+g)+ |
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113 | (f-12)+(12-f)+(p1-f)+(f-p1)+(f-g)+ |
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114 | 2.2*f+f*2.2+f/2.2+ |
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115 | 2*f+f*2+f/2+ |
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116 | 2.2*p1+p1*2.2+p1/2.2+ |
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117 | 2*p1+p1*2+p1/2 |
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118 | ); |
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119 | |
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120 | |
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121 | c = (e <= f ); |
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122 | c = (e <= 2.2); |
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123 | c = (e <= 2 ); |
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124 | c = (e <= p1 ); |
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125 | c = (2.2<= f ); |
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126 | c = (2 <= f ); |
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127 | c = (p1 <= f ); |
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128 | c = (p1 <= p2 ); |
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129 | c = (p1 <= 2.2); |
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130 | c = (p1 <= 2 ); |
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131 | c = (2.2<= p2 ); |
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132 | c = (2 <= p2 ); |
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133 | |
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134 | c = (e >= f ); |
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135 | c = (e >= 2.2); |
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136 | c = (e >= 2 ); |
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137 | c = (e >= p1 ); |
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138 | c = (2.2>= f ); |
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139 | c = (2 >= f ); |
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140 | c = (p1 >= f ); |
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141 | c = (p1 >= p2 ); |
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142 | c = (p1 >= 2.2); |
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143 | c = (p1 >= 2 ); |
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144 | c = (2.2>= p2 ); |
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145 | c = (2 >= p2 ); |
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146 | |
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147 | c = (e == f ); |
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148 | c = (e == 2.2); |
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149 | c = (e == 2 ); |
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150 | c = (e == p1 ); |
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151 | c = (2.2== f ); |
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152 | c = (2 == f ); |
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153 | c = (p1 == f ); |
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154 | //c = (p1 == p2 ); |
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155 | c = (p1 == 2.2); |
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156 | c = (p1 == 2 ); |
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157 | c = (2.2== p2 ); |
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158 | c = (2 == p2 ); |
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159 | |
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160 | c = (2 <= e <= 3); |
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161 | c = (2 <= p1<= 3); |
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162 | |
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163 | c = (2 >= e >= 3); |
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164 | c = (2 >= p1>= 3); |
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165 | |
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166 | e[x[3]]=2; |
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167 | e[x[3]]=4; |
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168 | e[x[3]]=1; |
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169 | e.constComp()=12; |
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170 | |
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171 | lp.addRow(LP::INF,e,23); |
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172 | lp.addRow(LP::INF,3.0*(x[1]+x[2]/2)-x[3],23); |
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173 | lp.addRow(LP::INF,3.0*(x[1]+x[2]*2-5*x[3]+12-x[4]/3)+2*x[4]-4,23); |
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174 | |
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175 | lp.addRow(x[1]+x[3]<=x[5]-3); |
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176 | lp.addRow(-7<=x[1]+x[3]-12<=3); |
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177 | lp.addRow(x[1]<=x[5]); |
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178 | } |
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179 | |
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180 | { |
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181 | LP::DualExpr e,f,g; |
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182 | LP::Row p1,p2,p3,p4,p5; |
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183 | |
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184 | e[p1]=2; |
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185 | e[p1]+=2; |
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186 | e[p1]-=2; |
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187 | |
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188 | e=p1; |
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189 | e=f; |
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190 | |
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191 | e+=p1; |
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192 | e+=f; |
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193 | |
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194 | e-=p1; |
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195 | e-=f; |
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196 | |
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197 | e*=2; |
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198 | e*=2.2; |
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199 | e/=2; |
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200 | e/=2.2; |
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201 | |
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202 | e=((p1+p2)+(p1-p2)+ |
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203 | (p1+f)+(f+p1)+(f+g)+ |
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204 | (p1-f)+(f-p1)+(f-g)+ |
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205 | 2.2*f+f*2.2+f/2.2+ |
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206 | 2*f+f*2+f/2+ |
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207 | 2.2*p1+p1*2.2+p1/2.2+ |
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208 | 2*p1+p1*2+p1/2 |
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209 | ); |
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210 | } |
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211 | |
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212 | #endif |
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213 | } |
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214 | |
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215 | void solveAndCheck(LpSolverBase& lp, LpSolverBase::SolutionStatus stat, |
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216 | double exp_opt) { |
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217 | using std::string; |
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218 | lp.solve(); |
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219 | //int decimal,sign; |
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220 | std::ostringstream buf; |
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221 | buf << "Primalstatus should be: " << int(stat); |
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222 | |
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223 | // itoa(stat,buf1, 10); |
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224 | check(lp.primalStatus()==stat, buf.str()); |
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225 | |
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226 | if (stat == LpSolverBase::OPTIMAL) { |
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227 | std::ostringstream buf; |
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228 | buf << "Wrong optimal value: the right optimum is " << exp_opt; |
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229 | check(std::abs(lp.primalValue()-exp_opt) < 1e-3, buf.str()); |
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230 | //+ecvt(exp_opt,2) |
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231 | } |
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232 | } |
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233 | |
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234 | void aTest(LpSolverBase & lp) |
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235 | { |
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236 | typedef LpSolverBase LP; |
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237 | |
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238 | //The following example is very simple |
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239 | |
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240 | typedef LpSolverBase::Row Row; |
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241 | typedef LpSolverBase::Col Col; |
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242 | |
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243 | |
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244 | Col x1 = lp.addCol(); |
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245 | Col x2 = lp.addCol(); |
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246 | |
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247 | |
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248 | //Constraints |
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249 | Row upright=lp.addRow(x1+x2 <=1); |
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250 | lp.addRow(x1+x2 >=-1); |
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251 | lp.addRow(x1-x2 <=1); |
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252 | lp.addRow(x1-x2 >=-1); |
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253 | //Nonnegativity of the variables |
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254 | lp.colLowerBound(x1, 0); |
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255 | lp.colLowerBound(x2, 0); |
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256 | //Objective function |
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257 | lp.setObj(x1+x2); |
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258 | |
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259 | lp.max(); |
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260 | |
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261 | //Maximization of x1+x2 |
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262 | //over the triangle with vertices (0,0) (0,1) (1,0) |
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263 | double expected_opt=1; |
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264 | solveAndCheck(lp, LpSolverBase::OPTIMAL, expected_opt); |
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265 | |
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266 | //Minimization |
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267 | lp.min(); |
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268 | expected_opt=0; |
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269 | solveAndCheck(lp, LpSolverBase::OPTIMAL, expected_opt); |
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270 | |
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271 | //Vertex (-1,0) instead of (0,0) |
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272 | lp.colLowerBound(x1, -LpSolverBase::INF); |
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273 | expected_opt=-1; |
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274 | solveAndCheck(lp, LpSolverBase::OPTIMAL, expected_opt); |
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275 | |
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276 | //Erase one constraint and return to maximization |
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277 | lp.eraseRow(upright); |
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278 | lp.max(); |
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279 | expected_opt=LpSolverBase::INF; |
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280 | solveAndCheck(lp, LpSolverBase::INFINITE, expected_opt); |
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281 | |
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282 | //Infeasibilty |
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283 | lp.addRow(x1+x2 <=-2); |
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284 | solveAndCheck(lp, LpSolverBase::INFEASIBLE, expected_opt); |
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285 | |
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286 | //Change problem and forget to solve |
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287 | lp.min(); |
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288 | check(lp.primalStatus()==LpSolverBase::UNDEFINED,"Primalstatus should be UNDEFINED"); |
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289 | |
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290 | // lp.solve(); |
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291 | // if (lp.primalStatus()==LpSolverBase::OPTIMAL){ |
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292 | // std::cout<< "Z = "<<lp.primalValue() |
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293 | // << " (error = " << lp.primalValue()-expected_opt |
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294 | // << "); x1 = "<<lp.primal(x1) |
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295 | // << "; x2 = "<<lp.primal(x2) |
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296 | // <<std::endl; |
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297 | |
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298 | // } |
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299 | // else{ |
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300 | // std::cout<<lp.primalStatus()<<std::endl; |
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301 | // std::cout<<"Optimal solution not found!"<<std::endl; |
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302 | // } |
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303 | |
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304 | |
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305 | |
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306 | } |
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307 | |
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308 | |
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309 | int main() |
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310 | { |
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311 | LpSkeleton lp_skel; |
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312 | lpTest(lp_skel); |
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313 | |
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314 | #ifdef HAVE_GLPK |
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315 | LpGlpk lp_glpk1,lp_glpk2; |
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316 | lpTest(lp_glpk1); |
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317 | aTest(lp_glpk2); |
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318 | #endif |
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319 | |
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320 | #ifdef HAVE_CPLEX |
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321 | LpCplex lp_cplex1,lp_cplex2; |
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322 | lpTest(lp_cplex1); |
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323 | aTest(lp_cplex2); |
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324 | #endif |
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325 | |
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326 | return 0; |
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327 | } |
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