[1261] | 1 | /* -*- C++ -*- |
---|
| 2 | * |
---|
[1956] | 3 | * This file is a part of LEMON, a generic C++ optimization library |
---|
| 4 | * |
---|
| 5 | * Copyright (C) 2003-2006 |
---|
| 6 | * Egervary Jeno Kombinatorikus Optimalizalasi Kutatocsoport |
---|
[1359] | 7 | * (Egervary Research Group on Combinatorial Optimization, EGRES). |
---|
[1261] | 8 | * |
---|
| 9 | * Permission to use, modify and distribute this software is granted |
---|
| 10 | * provided that this copyright notice appears in all copies. For |
---|
| 11 | * precise terms see the accompanying LICENSE file. |
---|
| 12 | * |
---|
| 13 | * This software is provided "AS IS" with no warranty of any kind, |
---|
| 14 | * express or implied, and with no claim as to its suitability for any |
---|
| 15 | * purpose. |
---|
| 16 | * |
---|
| 17 | */ |
---|
| 18 | |
---|
| 19 | #ifndef LEMON_LP_GLPK_CC |
---|
| 20 | #define LEMON_LP_GLPK_CC |
---|
| 21 | |
---|
| 22 | ///\file |
---|
| 23 | ///\brief Implementation of the LEMON-GLPK lp solver interface. |
---|
| 24 | |
---|
[1305] | 25 | #include <lemon/lp_glpk.h> |
---|
[1473] | 26 | //#include <iostream> |
---|
[1261] | 27 | namespace lemon { |
---|
| 28 | |
---|
[1364] | 29 | |
---|
[1321] | 30 | LpGlpk::LpGlpk() : Parent(), |
---|
| 31 | lp(lpx_create_prob()) { |
---|
| 32 | ///\todo constrol function for this: |
---|
| 33 | lpx_set_int_parm(lp, LPX_K_DUAL, 1); |
---|
| 34 | messageLevel(0); |
---|
| 35 | } |
---|
| 36 | |
---|
| 37 | LpGlpk::~LpGlpk() { |
---|
| 38 | lpx_delete_prob(lp); |
---|
| 39 | } |
---|
| 40 | |
---|
| 41 | int LpGlpk::_addCol() { |
---|
| 42 | int i=lpx_add_cols(lp, 1); |
---|
| 43 | _setColLowerBound(i, -INF); |
---|
| 44 | _setColUpperBound(i, INF); |
---|
| 45 | return i; |
---|
| 46 | } |
---|
| 47 | |
---|
[1436] | 48 | ///\e |
---|
| 49 | |
---|
| 50 | |
---|
| 51 | LpSolverBase &LpGlpk::_newLp() |
---|
| 52 | { |
---|
| 53 | LpGlpk* newlp=new LpGlpk(); |
---|
| 54 | return *newlp; |
---|
| 55 | } |
---|
| 56 | |
---|
| 57 | ///\e |
---|
| 58 | |
---|
| 59 | LpSolverBase &LpGlpk::_copyLp() |
---|
| 60 | { |
---|
| 61 | LpGlpk* newlp=new LpGlpk(); |
---|
| 62 | |
---|
| 63 | //Coefficient matrix, row bounds |
---|
| 64 | lpx_add_rows(newlp->lp, lpx_get_num_rows(lp)); |
---|
| 65 | lpx_add_cols(newlp->lp, lpx_get_num_cols(lp)); |
---|
| 66 | int len; |
---|
| 67 | int ind[1+lpx_get_num_cols(lp)]; |
---|
| 68 | Value val[1+lpx_get_num_cols(lp)]; |
---|
| 69 | for (int i=1;i<=lpx_get_num_rows(lp);++i){ |
---|
| 70 | len=lpx_get_mat_row(lp,i,ind,val); |
---|
| 71 | lpx_set_mat_row(newlp->lp, i,len,ind,val); |
---|
| 72 | lpx_set_row_bnds(newlp->lp,i,lpx_get_row_type(lp,i), |
---|
| 73 | lpx_get_row_lb(lp,i),lpx_get_row_ub(lp,i)); |
---|
| 74 | } |
---|
| 75 | |
---|
| 76 | //Objective function, coloumn bounds |
---|
| 77 | lpx_set_obj_dir(newlp->lp, lpx_get_obj_dir(lp)); |
---|
| 78 | //Objectif function's constant term treated separately |
---|
| 79 | lpx_set_obj_coef(newlp->lp,0,lpx_get_obj_coef(lp,0)); |
---|
| 80 | for (int i=1;i<=lpx_get_num_cols(lp);++i){ |
---|
| 81 | lpx_set_obj_coef(newlp->lp,i,lpx_get_obj_coef(lp,i)); |
---|
| 82 | lpx_set_col_bnds(newlp->lp,i,lpx_get_col_type(lp,i), |
---|
| 83 | lpx_get_col_lb(lp,i),lpx_get_col_ub(lp,i)); |
---|
| 84 | |
---|
| 85 | |
---|
| 86 | } |
---|
| 87 | |
---|
| 88 | return *newlp; |
---|
| 89 | } |
---|
| 90 | |
---|
[1321] | 91 | int LpGlpk::_addRow() { |
---|
| 92 | int i=lpx_add_rows(lp, 1); |
---|
| 93 | return i; |
---|
| 94 | } |
---|
| 95 | |
---|
| 96 | |
---|
[1432] | 97 | void LpGlpk::_eraseCol(int i) { |
---|
| 98 | int cols[2]; |
---|
| 99 | cols[1]=i; |
---|
| 100 | lpx_del_cols(lp, 1, cols); |
---|
| 101 | } |
---|
| 102 | |
---|
| 103 | void LpGlpk::_eraseRow(int i) { |
---|
| 104 | int rows[2]; |
---|
| 105 | rows[1]=i; |
---|
| 106 | lpx_del_rows(lp, 1, rows); |
---|
| 107 | } |
---|
| 108 | |
---|
[1895] | 109 | void LpGlpk::_getColName(int col, std::string & name) |
---|
| 110 | { |
---|
| 111 | |
---|
| 112 | char *n = lpx_get_col_name(lp,col); |
---|
| 113 | name = n?n:""; |
---|
| 114 | } |
---|
| 115 | |
---|
| 116 | |
---|
| 117 | void LpGlpk::_setColName(int col, const std::string & name) |
---|
| 118 | { |
---|
| 119 | lpx_set_col_name(lp,col,const_cast<char*>(name.c_str())); |
---|
| 120 | } |
---|
| 121 | |
---|
[1321] | 122 | void LpGlpk::_setRowCoeffs(int i, |
---|
| 123 | int length, |
---|
| 124 | const int * indices, |
---|
| 125 | const Value * values ) |
---|
| 126 | { |
---|
| 127 | lpx_set_mat_row(lp, i, length, |
---|
| 128 | const_cast<int * >(indices) , |
---|
| 129 | const_cast<Value * >(values)); |
---|
| 130 | } |
---|
| 131 | |
---|
| 132 | void LpGlpk::_setColCoeffs(int i, |
---|
| 133 | int length, |
---|
| 134 | const int * indices, |
---|
| 135 | const Value * values) |
---|
| 136 | { |
---|
| 137 | lpx_set_mat_col(lp, i, length, |
---|
| 138 | const_cast<int * >(indices), |
---|
| 139 | const_cast<Value * >(values)); |
---|
| 140 | } |
---|
[1431] | 141 | |
---|
| 142 | |
---|
| 143 | void LpGlpk::_setCoeff(int row, int col, Value value) |
---|
| 144 | { |
---|
| 145 | ///FIXME Of course this is not efficient at all, but GLPK knows not more. |
---|
| 146 | // First approach: get one row, apply changes and set it again |
---|
| 147 | //(one idea to improve this: maybe it is better to do this with 1 coloumn) |
---|
| 148 | |
---|
| 149 | int mem_length=2+lpx_get_num_cols(lp); |
---|
| 150 | int* indices = new int[mem_length]; |
---|
| 151 | Value* values = new Value[mem_length]; |
---|
| 152 | |
---|
| 153 | |
---|
| 154 | int length=lpx_get_mat_row(lp, row, indices, values); |
---|
| 155 | |
---|
| 156 | //The following code does not suppose that the elements of the array indices are sorted |
---|
| 157 | int i=1; |
---|
| 158 | bool found=false; |
---|
| 159 | while (i <= length && !found){ |
---|
| 160 | if (indices[i]==col){ |
---|
| 161 | found = true; |
---|
| 162 | values[i]=value; |
---|
| 163 | } |
---|
| 164 | ++i; |
---|
| 165 | } |
---|
| 166 | if (!found){ |
---|
| 167 | ++length; |
---|
| 168 | indices[length]=col; |
---|
| 169 | values[length]=value; |
---|
| 170 | } |
---|
| 171 | |
---|
| 172 | lpx_set_mat_row(lp, row, length, indices, values); |
---|
| 173 | delete [] indices; |
---|
| 174 | delete [] values; |
---|
| 175 | |
---|
| 176 | } |
---|
| 177 | |
---|
[1321] | 178 | void LpGlpk::_setColLowerBound(int i, Value lo) |
---|
| 179 | { |
---|
| 180 | if (lo==INF) { |
---|
| 181 | //FIXME error |
---|
| 182 | } |
---|
| 183 | int b=lpx_get_col_type(lp, i); |
---|
| 184 | double up=lpx_get_col_ub(lp, i); |
---|
| 185 | if (lo==-INF) { |
---|
| 186 | switch (b) { |
---|
| 187 | case LPX_FR: |
---|
| 188 | case LPX_LO: |
---|
| 189 | lpx_set_col_bnds(lp, i, LPX_FR, lo, up); |
---|
| 190 | break; |
---|
| 191 | case LPX_UP: |
---|
| 192 | break; |
---|
| 193 | case LPX_DB: |
---|
| 194 | case LPX_FX: |
---|
| 195 | lpx_set_col_bnds(lp, i, LPX_UP, lo, up); |
---|
| 196 | break; |
---|
| 197 | default: ; |
---|
| 198 | //FIXME error |
---|
| 199 | } |
---|
| 200 | } else { |
---|
| 201 | switch (b) { |
---|
| 202 | case LPX_FR: |
---|
| 203 | case LPX_LO: |
---|
| 204 | lpx_set_col_bnds(lp, i, LPX_LO, lo, up); |
---|
| 205 | break; |
---|
| 206 | case LPX_UP: |
---|
| 207 | case LPX_DB: |
---|
| 208 | case LPX_FX: |
---|
| 209 | if (lo==up) |
---|
| 210 | lpx_set_col_bnds(lp, i, LPX_FX, lo, up); |
---|
| 211 | else |
---|
| 212 | lpx_set_col_bnds(lp, i, LPX_DB, lo, up); |
---|
| 213 | break; |
---|
| 214 | default: ; |
---|
| 215 | //FIXME error |
---|
| 216 | } |
---|
[1261] | 217 | } |
---|
| 218 | |
---|
[1321] | 219 | } |
---|
| 220 | |
---|
| 221 | void LpGlpk::_setColUpperBound(int i, Value up) |
---|
| 222 | { |
---|
| 223 | if (up==-INF) { |
---|
| 224 | //FIXME error |
---|
[1261] | 225 | } |
---|
[1321] | 226 | int b=lpx_get_col_type(lp, i); |
---|
| 227 | double lo=lpx_get_col_lb(lp, i); |
---|
| 228 | if (up==INF) { |
---|
| 229 | switch (b) { |
---|
| 230 | case LPX_FR: |
---|
| 231 | case LPX_LO: |
---|
| 232 | break; |
---|
| 233 | case LPX_UP: |
---|
| 234 | lpx_set_col_bnds(lp, i, LPX_FR, lo, up); |
---|
| 235 | break; |
---|
| 236 | case LPX_DB: |
---|
| 237 | case LPX_FX: |
---|
| 238 | lpx_set_col_bnds(lp, i, LPX_LO, lo, up); |
---|
| 239 | break; |
---|
| 240 | default: ; |
---|
[1261] | 241 | //FIXME error |
---|
| 242 | } |
---|
[1321] | 243 | } else { |
---|
| 244 | switch (b) { |
---|
| 245 | case LPX_FR: |
---|
| 246 | lpx_set_col_bnds(lp, i, LPX_UP, lo, up); |
---|
| 247 | break; |
---|
| 248 | case LPX_UP: |
---|
| 249 | lpx_set_col_bnds(lp, i, LPX_UP, lo, up); |
---|
| 250 | break; |
---|
| 251 | case LPX_LO: |
---|
| 252 | case LPX_DB: |
---|
| 253 | case LPX_FX: |
---|
| 254 | if (lo==up) |
---|
| 255 | lpx_set_col_bnds(lp, i, LPX_FX, lo, up); |
---|
| 256 | else |
---|
| 257 | lpx_set_col_bnds(lp, i, LPX_DB, lo, up); |
---|
| 258 | break; |
---|
| 259 | default: ; |
---|
[1261] | 260 | //FIXME error |
---|
| 261 | } |
---|
[1321] | 262 | } |
---|
| 263 | } |
---|
| 264 | |
---|
[1405] | 265 | // void LpGlpk::_setRowLowerBound(int i, Value lo) |
---|
| 266 | // { |
---|
| 267 | // if (lo==INF) { |
---|
| 268 | // //FIXME error |
---|
| 269 | // } |
---|
| 270 | // int b=lpx_get_row_type(lp, i); |
---|
| 271 | // double up=lpx_get_row_ub(lp, i); |
---|
| 272 | // if (lo==-INF) { |
---|
| 273 | // switch (b) { |
---|
| 274 | // case LPX_FR: |
---|
| 275 | // case LPX_LO: |
---|
| 276 | // lpx_set_row_bnds(lp, i, LPX_FR, lo, up); |
---|
| 277 | // break; |
---|
| 278 | // case LPX_UP: |
---|
| 279 | // break; |
---|
| 280 | // case LPX_DB: |
---|
| 281 | // case LPX_FX: |
---|
| 282 | // lpx_set_row_bnds(lp, i, LPX_UP, lo, up); |
---|
| 283 | // break; |
---|
| 284 | // default: ; |
---|
| 285 | // //FIXME error |
---|
| 286 | // } |
---|
| 287 | // } else { |
---|
| 288 | // switch (b) { |
---|
| 289 | // case LPX_FR: |
---|
| 290 | // case LPX_LO: |
---|
| 291 | // lpx_set_row_bnds(lp, i, LPX_LO, lo, up); |
---|
| 292 | // break; |
---|
| 293 | // case LPX_UP: |
---|
| 294 | // case LPX_DB: |
---|
| 295 | // case LPX_FX: |
---|
| 296 | // if (lo==up) |
---|
| 297 | // lpx_set_row_bnds(lp, i, LPX_FX, lo, up); |
---|
| 298 | // else |
---|
| 299 | // lpx_set_row_bnds(lp, i, LPX_DB, lo, up); |
---|
| 300 | // break; |
---|
| 301 | // default: ; |
---|
| 302 | // //FIXME error |
---|
| 303 | // } |
---|
| 304 | // } |
---|
| 305 | // } |
---|
[1261] | 306 | |
---|
[1405] | 307 | // void LpGlpk::_setRowUpperBound(int i, Value up) |
---|
| 308 | // { |
---|
| 309 | // if (up==-INF) { |
---|
| 310 | // //FIXME error |
---|
| 311 | // } |
---|
| 312 | // int b=lpx_get_row_type(lp, i); |
---|
| 313 | // double lo=lpx_get_row_lb(lp, i); |
---|
| 314 | // if (up==INF) { |
---|
| 315 | // switch (b) { |
---|
| 316 | // case LPX_FR: |
---|
| 317 | // case LPX_LO: |
---|
| 318 | // break; |
---|
| 319 | // case LPX_UP: |
---|
| 320 | // lpx_set_row_bnds(lp, i, LPX_FR, lo, up); |
---|
| 321 | // break; |
---|
| 322 | // case LPX_DB: |
---|
| 323 | // case LPX_FX: |
---|
| 324 | // lpx_set_row_bnds(lp, i, LPX_LO, lo, up); |
---|
| 325 | // break; |
---|
| 326 | // default: ; |
---|
| 327 | // //FIXME error |
---|
| 328 | // } |
---|
| 329 | // } else { |
---|
| 330 | // switch (b) { |
---|
| 331 | // case LPX_FR: |
---|
| 332 | // lpx_set_row_bnds(lp, i, LPX_UP, lo, up); |
---|
| 333 | // break; |
---|
| 334 | // case LPX_UP: |
---|
| 335 | // lpx_set_row_bnds(lp, i, LPX_UP, lo, up); |
---|
| 336 | // break; |
---|
| 337 | // case LPX_LO: |
---|
| 338 | // case LPX_DB: |
---|
| 339 | // case LPX_FX: |
---|
| 340 | // if (lo==up) |
---|
| 341 | // lpx_set_row_bnds(lp, i, LPX_FX, lo, up); |
---|
| 342 | // else |
---|
| 343 | // lpx_set_row_bnds(lp, i, LPX_DB, lo, up); |
---|
| 344 | // break; |
---|
| 345 | // default: ; |
---|
| 346 | // //FIXME error |
---|
| 347 | // } |
---|
| 348 | // } |
---|
| 349 | // } |
---|
[1379] | 350 | |
---|
| 351 | void LpGlpk::_setRowBounds(int i, Value lb, Value ub) |
---|
| 352 | { |
---|
| 353 | //Bad parameter |
---|
| 354 | if (lb==INF || ub==-INF) { |
---|
| 355 | //FIXME error |
---|
| 356 | } |
---|
| 357 | |
---|
| 358 | if (lb == -INF){ |
---|
| 359 | if (ub == INF){ |
---|
| 360 | lpx_set_row_bnds(lp, i, LPX_FR, lb, ub); |
---|
| 361 | } |
---|
| 362 | else{ |
---|
| 363 | lpx_set_row_bnds(lp, i, LPX_UP, lb, ub); |
---|
| 364 | } |
---|
| 365 | } |
---|
| 366 | else{ |
---|
| 367 | if (ub==INF){ |
---|
| 368 | lpx_set_row_bnds(lp, i, LPX_LO, lb, ub); |
---|
| 369 | |
---|
| 370 | } |
---|
| 371 | else{ |
---|
| 372 | if (lb == ub){ |
---|
| 373 | lpx_set_row_bnds(lp, i, LPX_FX, lb, ub); |
---|
| 374 | } |
---|
| 375 | else{ |
---|
| 376 | lpx_set_row_bnds(lp, i, LPX_DB, lb, ub); |
---|
| 377 | } |
---|
| 378 | } |
---|
| 379 | } |
---|
| 380 | |
---|
| 381 | } |
---|
[1261] | 382 | |
---|
[1298] | 383 | void LpGlpk::_setObjCoeff(int i, Value obj_coef) |
---|
| 384 | { |
---|
[1376] | 385 | //i=0 means the constant term (shift) |
---|
[1298] | 386 | lpx_set_obj_coef(lp, i, obj_coef); |
---|
| 387 | } |
---|
[1261] | 388 | |
---|
[1377] | 389 | void LpGlpk::_clearObj() |
---|
[1376] | 390 | { |
---|
[1377] | 391 | for (int i=0;i<=lpx_get_num_cols(lp);++i){ |
---|
| 392 | lpx_set_obj_coef(lp, i, 0); |
---|
[1376] | 393 | } |
---|
| 394 | } |
---|
[1377] | 395 | // void LpGlpk::_setObj(int length, |
---|
| 396 | // int const * indices, |
---|
| 397 | // Value const * values ) |
---|
| 398 | // { |
---|
| 399 | // Value new_values[1+lpx_num_cols()]; |
---|
| 400 | // for (i=0;i<=lpx_num_cols();++i){ |
---|
| 401 | // new_values[i]=0; |
---|
| 402 | // } |
---|
| 403 | // for (i=1;i<=length;++i){ |
---|
| 404 | // new_values[indices[i]]=values[i]; |
---|
| 405 | // } |
---|
| 406 | |
---|
| 407 | // for (i=0;i<=lpx_num_cols();++i){ |
---|
| 408 | // lpx_set_obj_coef(lp, i, new_values[i]); |
---|
| 409 | // } |
---|
| 410 | // } |
---|
[1263] | 411 | |
---|
[1303] | 412 | LpGlpk::SolveExitStatus LpGlpk::_solve() |
---|
[1263] | 413 | { |
---|
[1458] | 414 | int i = lpx_simplex(lp); |
---|
[1298] | 415 | switch (i) { |
---|
| 416 | case LPX_E_OK: |
---|
| 417 | return SOLVED; |
---|
| 418 | default: |
---|
| 419 | return UNSOLVED; |
---|
| 420 | } |
---|
[1263] | 421 | } |
---|
| 422 | |
---|
[1293] | 423 | LpGlpk::Value LpGlpk::_getPrimal(int i) |
---|
[1263] | 424 | { |
---|
[1298] | 425 | return lpx_get_col_prim(lp,i); |
---|
[1263] | 426 | } |
---|
[1787] | 427 | |
---|
| 428 | LpGlpk::Value LpGlpk::_getDual(int i) |
---|
| 429 | { |
---|
| 430 | return lpx_get_row_dual(lp,i); |
---|
| 431 | } |
---|
[1263] | 432 | |
---|
[1312] | 433 | LpGlpk::Value LpGlpk::_getPrimalValue() |
---|
| 434 | { |
---|
[1314] | 435 | return lpx_get_obj_val(lp); |
---|
[1312] | 436 | } |
---|
[1840] | 437 | bool LpGlpk::_isBasicCol(int i) { |
---|
| 438 | return (lpx_get_col_stat(lp, i)==LPX_BS); |
---|
| 439 | } |
---|
[1312] | 440 | |
---|
[1298] | 441 | |
---|
[1312] | 442 | LpGlpk::SolutionStatus LpGlpk::_getPrimalStatus() |
---|
[1294] | 443 | { |
---|
[1298] | 444 | int stat= lpx_get_status(lp); |
---|
| 445 | switch (stat) { |
---|
| 446 | case LPX_UNDEF://Undefined (no solve has been run yet) |
---|
| 447 | return UNDEFINED; |
---|
[1458] | 448 | case LPX_NOFEAS://There is no feasible solution (primal, I guess) |
---|
| 449 | case LPX_INFEAS://Infeasible |
---|
| 450 | return INFEASIBLE; |
---|
| 451 | case LPX_UNBND://Unbounded |
---|
| 452 | return INFINITE; |
---|
| 453 | case LPX_FEAS://Feasible |
---|
| 454 | return FEASIBLE; |
---|
| 455 | case LPX_OPT://Feasible |
---|
| 456 | return OPTIMAL; |
---|
| 457 | default: |
---|
| 458 | return UNDEFINED; //to avoid gcc warning |
---|
| 459 | //FIXME error |
---|
| 460 | } |
---|
| 461 | } |
---|
| 462 | |
---|
| 463 | LpGlpk::SolutionStatus LpGlpk::_getDualStatus() |
---|
| 464 | { |
---|
[1473] | 465 | // std::cout<<"Itt megy: "<<lpx_get_dual_stat(lp)<<std::endl; |
---|
| 466 | // std::cout<<"Itt a primal: "<<lpx_get_prim_stat(lp)<<std::endl; |
---|
| 467 | |
---|
[1466] | 468 | switch (lpx_get_dual_stat(lp)) { |
---|
[1458] | 469 | case LPX_D_UNDEF://Undefined (no solve has been run yet) |
---|
| 470 | return UNDEFINED; |
---|
[1540] | 471 | case LPX_D_NOFEAS://There is no dual feasible solution |
---|
[1460] | 472 | // case LPX_D_INFEAS://Infeasible |
---|
[1458] | 473 | return INFEASIBLE; |
---|
[1473] | 474 | case LPX_D_FEAS://Feasible |
---|
| 475 | switch (lpx_get_status(lp)) { |
---|
| 476 | case LPX_NOFEAS: |
---|
[1458] | 477 | return INFINITE; |
---|
| 478 | case LPX_OPT: |
---|
| 479 | return OPTIMAL; |
---|
| 480 | default: |
---|
| 481 | return FEASIBLE; |
---|
| 482 | } |
---|
| 483 | default: |
---|
| 484 | return UNDEFINED; //to avoid gcc warning |
---|
| 485 | //FIXME error |
---|
| 486 | } |
---|
| 487 | } |
---|
| 488 | |
---|
[1463] | 489 | LpGlpk::ProblemTypes LpGlpk::_getProblemType() |
---|
[1458] | 490 | { |
---|
[1460] | 491 | //int stat= lpx_get_status(lp); |
---|
[1458] | 492 | int statp= lpx_get_prim_stat(lp); |
---|
| 493 | int statd= lpx_get_dual_stat(lp); |
---|
[1464] | 494 | if (statp==LPX_P_FEAS && statd==LPX_D_FEAS) |
---|
[1460] | 495 | return PRIMAL_DUAL_FEASIBLE; |
---|
[1464] | 496 | if (statp==LPX_P_FEAS && statd==LPX_D_NOFEAS) |
---|
[1460] | 497 | return PRIMAL_FEASIBLE_DUAL_INFEASIBLE; |
---|
[1464] | 498 | if (statp==LPX_P_NOFEAS && statd==LPX_D_FEAS) |
---|
[1460] | 499 | return PRIMAL_INFEASIBLE_DUAL_FEASIBLE; |
---|
[1464] | 500 | if (statp==LPX_P_NOFEAS && statd==LPX_D_NOFEAS) |
---|
[1460] | 501 | return PRIMAL_DUAL_INFEASIBLE; |
---|
| 502 | //In all other cases |
---|
| 503 | return UNKNOWN; |
---|
[1294] | 504 | } |
---|
[1263] | 505 | |
---|
[1312] | 506 | void LpGlpk::_setMax() |
---|
| 507 | { |
---|
[1321] | 508 | lpx_set_obj_dir(lp, LPX_MAX); |
---|
| 509 | } |
---|
| 510 | |
---|
[1312] | 511 | void LpGlpk::_setMin() |
---|
| 512 | { |
---|
[1321] | 513 | lpx_set_obj_dir(lp, LPX_MIN); |
---|
| 514 | } |
---|
| 515 | |
---|
| 516 | |
---|
| 517 | void LpGlpk::messageLevel(int m) |
---|
| 518 | { |
---|
| 519 | lpx_set_int_parm(lp, LPX_K_MSGLEV, m); |
---|
| 520 | } |
---|
[1312] | 521 | |
---|
[1326] | 522 | void LpGlpk::presolver(bool b) |
---|
| 523 | { |
---|
| 524 | lpx_set_int_parm(lp, LPX_K_PRESOL, b); |
---|
| 525 | } |
---|
| 526 | |
---|
[1312] | 527 | |
---|
[1261] | 528 | } //END OF NAMESPACE LEMON |
---|
| 529 | |
---|
| 530 | #endif //LEMON_LP_GLPK_CC |
---|