[1261] | 1 | /* -*- C++ -*- |
---|
| 2 | * src/lemon/lp_glpk.cc - Part of LEMON, a generic C++ optimization library |
---|
| 3 | * |
---|
| 4 | * Copyright (C) 2005 Egervary Jeno Kombinatorikus Optimalizalasi Kutatocsoport |
---|
| 5 | * (Egervary Combinatorial Optimization Research Group, EGRES). |
---|
| 6 | * |
---|
| 7 | * Permission to use, modify and distribute this software is granted |
---|
| 8 | * provided that this copyright notice appears in all copies. For |
---|
| 9 | * precise terms see the accompanying LICENSE file. |
---|
| 10 | * |
---|
| 11 | * This software is provided "AS IS" with no warranty of any kind, |
---|
| 12 | * express or implied, and with no claim as to its suitability for any |
---|
| 13 | * purpose. |
---|
| 14 | * |
---|
| 15 | */ |
---|
| 16 | |
---|
| 17 | #ifndef LEMON_LP_GLPK_CC |
---|
| 18 | #define LEMON_LP_GLPK_CC |
---|
| 19 | |
---|
| 20 | ///\file |
---|
| 21 | ///\brief Implementation of the LEMON-GLPK lp solver interface. |
---|
| 22 | |
---|
| 23 | #include "lp_glpk.h" |
---|
| 24 | |
---|
| 25 | namespace lemon { |
---|
| 26 | |
---|
| 27 | /// \e |
---|
| 28 | int LpGlpk::_addCol() { |
---|
| 29 | int i=lpx_add_cols(lp, 1); |
---|
| 30 | _setColLowerBound(i, -INF); |
---|
| 31 | _setColUpperBound(i, INF); |
---|
| 32 | return i; |
---|
| 33 | } |
---|
| 34 | |
---|
| 35 | /// \e |
---|
| 36 | int LpGlpk::_addRow() { |
---|
| 37 | int i=lpx_add_rows(lp, 1); |
---|
| 38 | return i; |
---|
| 39 | } |
---|
| 40 | |
---|
| 41 | |
---|
| 42 | void LpGlpk::_setRowCoeffs(int i, |
---|
| 43 | int length, |
---|
[1263] | 44 | const int * indices, |
---|
| 45 | const Value * values ) |
---|
[1261] | 46 | { |
---|
[1263] | 47 | lpx_set_mat_row(lp, i, length, |
---|
| 48 | const_cast<int * >(indices) , |
---|
| 49 | const_cast<Value * >(values)); |
---|
[1261] | 50 | } |
---|
| 51 | |
---|
| 52 | void LpGlpk::_setColCoeffs(int i, |
---|
| 53 | int length, |
---|
[1263] | 54 | const int * indices, |
---|
| 55 | const Value * values) |
---|
[1261] | 56 | { |
---|
[1263] | 57 | lpx_set_mat_col(lp, i, length, |
---|
| 58 | const_cast<int * >(indices), |
---|
| 59 | const_cast<Value * >(values)); |
---|
[1261] | 60 | } |
---|
| 61 | |
---|
| 62 | void LpGlpk::_setColLowerBound(int i, Value lo) |
---|
| 63 | { |
---|
| 64 | if (lo==INF) { |
---|
| 65 | //FIXME error |
---|
| 66 | } |
---|
| 67 | int b=lpx_get_col_type(lp, i); |
---|
| 68 | double up=lpx_get_col_ub(lp, i); |
---|
| 69 | if (lo==-INF) { |
---|
| 70 | switch (b) { |
---|
| 71 | case LPX_FR: |
---|
| 72 | case LPX_LO: |
---|
| 73 | lpx_set_col_bnds(lp, i, LPX_FR, lo, up); |
---|
| 74 | break; |
---|
| 75 | case LPX_UP: |
---|
| 76 | break; |
---|
| 77 | case LPX_DB: |
---|
| 78 | case LPX_FX: |
---|
| 79 | lpx_set_col_bnds(lp, i, LPX_UP, lo, up); |
---|
| 80 | break; |
---|
| 81 | default: ; |
---|
| 82 | //FIXME error |
---|
| 83 | } |
---|
| 84 | } else { |
---|
| 85 | switch (b) { |
---|
| 86 | case LPX_FR: |
---|
| 87 | case LPX_LO: |
---|
| 88 | lpx_set_col_bnds(lp, i, LPX_LO, lo, up); |
---|
| 89 | break; |
---|
| 90 | case LPX_UP: |
---|
| 91 | case LPX_DB: |
---|
| 92 | case LPX_FX: |
---|
| 93 | if (lo==up) |
---|
| 94 | lpx_set_col_bnds(lp, i, LPX_FX, lo, up); |
---|
| 95 | else |
---|
| 96 | lpx_set_col_bnds(lp, i, LPX_DB, lo, up); |
---|
| 97 | break; |
---|
| 98 | default: ; |
---|
| 99 | //FIXME error |
---|
| 100 | } |
---|
| 101 | } |
---|
| 102 | |
---|
| 103 | } |
---|
| 104 | |
---|
| 105 | void LpGlpk::_setColUpperBound(int i, Value up) |
---|
| 106 | { |
---|
| 107 | if (up==-INF) { |
---|
| 108 | //FIXME error |
---|
| 109 | } |
---|
| 110 | int b=lpx_get_col_type(lp, i); |
---|
| 111 | double lo=lpx_get_col_lb(lp, i); |
---|
| 112 | if (up==INF) { |
---|
| 113 | switch (b) { |
---|
| 114 | case LPX_FR: |
---|
| 115 | case LPX_LO: |
---|
| 116 | break; |
---|
| 117 | case LPX_UP: |
---|
| 118 | lpx_set_col_bnds(lp, i, LPX_FR, lo, up); |
---|
| 119 | break; |
---|
| 120 | case LPX_DB: |
---|
| 121 | case LPX_FX: |
---|
| 122 | lpx_set_col_bnds(lp, i, LPX_LO, lo, up); |
---|
| 123 | break; |
---|
| 124 | default: ; |
---|
| 125 | //FIXME error |
---|
| 126 | } |
---|
| 127 | } else { |
---|
| 128 | switch (b) { |
---|
| 129 | case LPX_FR: |
---|
| 130 | lpx_set_col_bnds(lp, i, LPX_UP, lo, up); |
---|
| 131 | break; |
---|
| 132 | case LPX_UP: |
---|
| 133 | lpx_set_col_bnds(lp, i, LPX_UP, lo, up); |
---|
| 134 | break; |
---|
| 135 | case LPX_LO: |
---|
| 136 | case LPX_DB: |
---|
| 137 | case LPX_FX: |
---|
| 138 | if (lo==up) |
---|
| 139 | lpx_set_col_bnds(lp, i, LPX_FX, lo, up); |
---|
| 140 | else |
---|
| 141 | lpx_set_col_bnds(lp, i, LPX_DB, lo, up); |
---|
| 142 | break; |
---|
| 143 | default: ; |
---|
| 144 | //FIXME error |
---|
| 145 | } |
---|
| 146 | } |
---|
| 147 | } |
---|
| 148 | |
---|
| 149 | void LpGlpk::_setRowLowerBound(int i, Value lo) |
---|
| 150 | { |
---|
| 151 | if (lo==INF) { |
---|
| 152 | //FIXME error |
---|
| 153 | } |
---|
| 154 | int b=lpx_get_row_type(lp, i); |
---|
| 155 | double up=lpx_get_row_ub(lp, i); |
---|
| 156 | if (lo==-INF) { |
---|
| 157 | switch (b) { |
---|
| 158 | case LPX_FR: |
---|
| 159 | case LPX_LO: |
---|
| 160 | lpx_set_row_bnds(lp, i, LPX_FR, lo, up); |
---|
| 161 | break; |
---|
| 162 | case LPX_UP: |
---|
| 163 | break; |
---|
| 164 | case LPX_DB: |
---|
| 165 | case LPX_FX: |
---|
| 166 | lpx_set_row_bnds(lp, i, LPX_UP, lo, up); |
---|
| 167 | break; |
---|
| 168 | default: ; |
---|
| 169 | //FIXME error |
---|
| 170 | } |
---|
| 171 | } else { |
---|
| 172 | switch (b) { |
---|
| 173 | case LPX_FR: |
---|
| 174 | case LPX_LO: |
---|
| 175 | lpx_set_row_bnds(lp, i, LPX_LO, lo, up); |
---|
| 176 | break; |
---|
| 177 | case LPX_UP: |
---|
| 178 | case LPX_DB: |
---|
| 179 | case LPX_FX: |
---|
| 180 | if (lo==up) |
---|
| 181 | lpx_set_row_bnds(lp, i, LPX_FX, lo, up); |
---|
| 182 | else |
---|
| 183 | lpx_set_row_bnds(lp, i, LPX_DB, lo, up); |
---|
| 184 | break; |
---|
| 185 | default: ; |
---|
| 186 | //FIXME error |
---|
| 187 | } |
---|
| 188 | } |
---|
| 189 | } |
---|
| 190 | |
---|
[1298] | 191 | void LpGlpk::_setRowUpperBound(int i, Value up) |
---|
| 192 | { |
---|
| 193 | if (up==-INF) { |
---|
| 194 | //FIXME error |
---|
| 195 | } |
---|
| 196 | int b=lpx_get_row_type(lp, i); |
---|
| 197 | double lo=lpx_get_row_lb(lp, i); |
---|
| 198 | if (up==INF) { |
---|
| 199 | switch (b) { |
---|
| 200 | case LPX_FR: |
---|
| 201 | case LPX_LO: |
---|
| 202 | break; |
---|
| 203 | case LPX_UP: |
---|
| 204 | lpx_set_row_bnds(lp, i, LPX_FR, lo, up); |
---|
| 205 | break; |
---|
| 206 | case LPX_DB: |
---|
| 207 | case LPX_FX: |
---|
| 208 | lpx_set_row_bnds(lp, i, LPX_LO, lo, up); |
---|
| 209 | break; |
---|
| 210 | default: ; |
---|
[1261] | 211 | //FIXME error |
---|
| 212 | } |
---|
[1298] | 213 | } else { |
---|
| 214 | switch (b) { |
---|
| 215 | case LPX_FR: |
---|
| 216 | lpx_set_row_bnds(lp, i, LPX_UP, lo, up); |
---|
| 217 | break; |
---|
| 218 | case LPX_UP: |
---|
| 219 | lpx_set_row_bnds(lp, i, LPX_UP, lo, up); |
---|
| 220 | break; |
---|
| 221 | case LPX_LO: |
---|
| 222 | case LPX_DB: |
---|
| 223 | case LPX_FX: |
---|
| 224 | if (lo==up) |
---|
| 225 | lpx_set_row_bnds(lp, i, LPX_FX, lo, up); |
---|
| 226 | else |
---|
| 227 | lpx_set_row_bnds(lp, i, LPX_DB, lo, up); |
---|
| 228 | break; |
---|
| 229 | default: ; |
---|
| 230 | //FIXME error |
---|
[1261] | 231 | } |
---|
| 232 | } |
---|
[1298] | 233 | } |
---|
[1261] | 234 | |
---|
[1298] | 235 | void LpGlpk::_setObjCoeff(int i, Value obj_coef) |
---|
| 236 | { |
---|
| 237 | lpx_set_obj_coef(lp, i, obj_coef); |
---|
| 238 | } |
---|
[1261] | 239 | |
---|
[1263] | 240 | |
---|
[1293] | 241 | LpGlpk::SolutionStatus LpGlpk::_solve() |
---|
[1263] | 242 | { |
---|
[1298] | 243 | int i= lpx_simplex(lp); |
---|
| 244 | switch (i) { |
---|
| 245 | case LPX_E_OK: |
---|
| 246 | return SOLVED; |
---|
| 247 | break; |
---|
| 248 | default: |
---|
| 249 | return UNSOLVED; |
---|
| 250 | } |
---|
[1263] | 251 | } |
---|
| 252 | |
---|
[1293] | 253 | LpGlpk::Value LpGlpk::_getPrimal(int i) |
---|
[1263] | 254 | { |
---|
[1298] | 255 | return lpx_get_col_prim(lp,i); |
---|
[1263] | 256 | } |
---|
| 257 | |
---|
[1298] | 258 | |
---|
[1294] | 259 | LpGlpk::SolutionType LpGlpk::_getPrimalType() |
---|
| 260 | { |
---|
[1298] | 261 | int stat= lpx_get_status(lp); |
---|
| 262 | switch (stat) { |
---|
| 263 | case LPX_UNDEF://Undefined (no solve has been run yet) |
---|
| 264 | return UNDEFINED; |
---|
| 265 | break; |
---|
| 266 | case LPX_NOFEAS://There is no feasible solution (primal, I guess) |
---|
| 267 | case LPX_INFEAS://Infeasible |
---|
| 268 | return INFEASIBLE; |
---|
| 269 | break; |
---|
| 270 | case LPX_UNBND://Unbounded |
---|
| 271 | return INFINITE; |
---|
| 272 | break; |
---|
| 273 | case LPX_FEAS://Feasible |
---|
| 274 | 2 return FEASIBLE; |
---|
| 275 | break; |
---|
| 276 | case LPX_OPT://Feasible |
---|
| 277 | return OPTIMAL; |
---|
| 278 | break; |
---|
| 279 | default: ; |
---|
| 280 | //FIXME error |
---|
| 281 | } |
---|
[1294] | 282 | } |
---|
[1263] | 283 | |
---|
| 284 | |
---|
[1261] | 285 | } //END OF NAMESPACE LEMON |
---|
| 286 | |
---|
| 287 | #endif //LEMON_LP_GLPK_CC |
---|