1 | /* -*- C++ -*- |
---|
2 | * |
---|
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 |
---|
7 | * (Egervary Research Group on Combinatorial Optimization, EGRES). |
---|
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 | ///\file |
---|
20 | ///\brief Implementation of the LEMON-GLPK lp solver interface. |
---|
21 | |
---|
22 | #include <lemon/lp_glpk.h> |
---|
23 | //#include <iostream> |
---|
24 | namespace lemon { |
---|
25 | |
---|
26 | |
---|
27 | LpGlpk::LpGlpk() : Parent() { |
---|
28 | rows = _lp_bits::LpId(1); |
---|
29 | cols = _lp_bits::LpId(1); |
---|
30 | lp = lpx_create_prob(); |
---|
31 | ///\todo control function for this: |
---|
32 | lpx_set_int_parm(lp, LPX_K_DUAL, 1); |
---|
33 | messageLevel(0); |
---|
34 | } |
---|
35 | |
---|
36 | LpGlpk::LpGlpk(const LpGlpk &glp) : Parent() { |
---|
37 | rows = _lp_bits::LpId(1); |
---|
38 | cols = _lp_bits::LpId(1); |
---|
39 | lp = lpx_create_prob(); |
---|
40 | lpx_create_index(lp); |
---|
41 | ///\todo control function for this: |
---|
42 | lpx_set_int_parm(lp, LPX_K_DUAL, 1); |
---|
43 | messageLevel(0); |
---|
44 | //Coefficient matrix, row bounds |
---|
45 | lpx_add_rows(lp, lpx_get_num_rows(glp.lp)); |
---|
46 | lpx_add_cols(lp, lpx_get_num_cols(glp.lp)); |
---|
47 | int len; |
---|
48 | int ind[1+lpx_get_num_cols(glp.lp)]; |
---|
49 | Value val[1+lpx_get_num_cols(glp.lp)]; |
---|
50 | for (int i=1;i<=lpx_get_num_rows(glp.lp);++i) |
---|
51 | { |
---|
52 | len=lpx_get_mat_row(glp.lp,i,ind,val); |
---|
53 | lpx_set_mat_row(lp, i,len,ind,val); |
---|
54 | lpx_set_row_bnds(lp,i,lpx_get_row_type(glp.lp,i), |
---|
55 | lpx_get_row_lb(glp.lp,i),lpx_get_row_ub(glp.lp,i)); |
---|
56 | } |
---|
57 | |
---|
58 | //Objective function, coloumn bounds |
---|
59 | lpx_set_obj_dir(lp, lpx_get_obj_dir(glp.lp)); |
---|
60 | //Objectif function's constant term treated separately |
---|
61 | lpx_set_obj_coef(lp,0,lpx_get_obj_coef(glp.lp,0)); |
---|
62 | for (int i=1;i<=lpx_get_num_cols(glp.lp);++i) |
---|
63 | { |
---|
64 | lpx_set_obj_coef(lp,i,lpx_get_obj_coef(glp.lp,i)); |
---|
65 | lpx_set_col_bnds(lp,i,lpx_get_col_type(glp.lp,i), |
---|
66 | lpx_get_col_lb(glp.lp,i),lpx_get_col_ub(glp.lp,i)); |
---|
67 | } |
---|
68 | } |
---|
69 | |
---|
70 | LpGlpk::~LpGlpk() { |
---|
71 | lpx_delete_prob(lp); |
---|
72 | } |
---|
73 | |
---|
74 | int LpGlpk::_addCol() { |
---|
75 | int i=lpx_add_cols(lp, 1); |
---|
76 | _setColLowerBound(i, -INF); |
---|
77 | _setColUpperBound(i, INF); |
---|
78 | return i; |
---|
79 | } |
---|
80 | |
---|
81 | ///\e |
---|
82 | |
---|
83 | |
---|
84 | LpSolverBase &LpGlpk::_newLp() |
---|
85 | { |
---|
86 | LpGlpk* newlp=new LpGlpk; |
---|
87 | return *newlp; |
---|
88 | } |
---|
89 | |
---|
90 | ///\e |
---|
91 | |
---|
92 | LpSolverBase &LpGlpk::_copyLp() |
---|
93 | { |
---|
94 | LpGlpk* newlp=new LpGlpk(*this); |
---|
95 | return *newlp; |
---|
96 | } |
---|
97 | |
---|
98 | int LpGlpk::_addRow() { |
---|
99 | int i=lpx_add_rows(lp, 1); |
---|
100 | return i; |
---|
101 | } |
---|
102 | |
---|
103 | |
---|
104 | void LpGlpk::_eraseCol(int i) { |
---|
105 | int cols[2]; |
---|
106 | cols[1]=i; |
---|
107 | lpx_del_cols(lp, 1, cols); |
---|
108 | } |
---|
109 | |
---|
110 | void LpGlpk::_eraseRow(int i) { |
---|
111 | int rows[2]; |
---|
112 | rows[1]=i; |
---|
113 | lpx_del_rows(lp, 1, rows); |
---|
114 | } |
---|
115 | |
---|
116 | void LpGlpk::_getColName(int col, std::string & name) const |
---|
117 | { |
---|
118 | |
---|
119 | char *n = lpx_get_col_name(lp,col); |
---|
120 | name = n?n:""; |
---|
121 | } |
---|
122 | |
---|
123 | |
---|
124 | void LpGlpk::_setColName(int col, const std::string & name) |
---|
125 | { |
---|
126 | lpx_set_col_name(lp,col,const_cast<char*>(name.c_str())); |
---|
127 | |
---|
128 | } |
---|
129 | |
---|
130 | int LpGlpk::_colByName(const std::string& name) const |
---|
131 | { |
---|
132 | int k = lpx_find_col(lp, const_cast<char*>(name.c_str())); |
---|
133 | return k > 0 ? k : -1; |
---|
134 | } |
---|
135 | |
---|
136 | |
---|
137 | void LpGlpk::_setRowCoeffs(int i, ConstRowIterator b, ConstRowIterator e) |
---|
138 | { |
---|
139 | std::vector<int> indices; |
---|
140 | std::vector<Value> values; |
---|
141 | |
---|
142 | indices.push_back(0); |
---|
143 | values.push_back(0); |
---|
144 | |
---|
145 | for(ConstRowIterator it=b; it!=e; ++it) { |
---|
146 | indices.push_back(it->first); |
---|
147 | values.push_back(it->second); |
---|
148 | } |
---|
149 | |
---|
150 | lpx_set_mat_row(lp, i, values.size() - 1, &indices[0], &values[0]); |
---|
151 | } |
---|
152 | |
---|
153 | void LpGlpk::_getRowCoeffs(int i, RowIterator b) const |
---|
154 | { |
---|
155 | int length = lpx_get_mat_row(lp, i, 0, 0); |
---|
156 | |
---|
157 | std::vector<int> indices(length + 1); |
---|
158 | std::vector<Value> values(length + 1); |
---|
159 | |
---|
160 | lpx_get_mat_row(lp, i, &indices[0], &values[0]); |
---|
161 | |
---|
162 | for (int i = 1; i <= length; ++i) { |
---|
163 | *b = std::make_pair(indices[i], values[i]); |
---|
164 | ++b; |
---|
165 | } |
---|
166 | } |
---|
167 | |
---|
168 | void LpGlpk::_setColCoeffs(int i, ConstColIterator b, ConstColIterator e) { |
---|
169 | |
---|
170 | std::vector<int> indices; |
---|
171 | std::vector<Value> values; |
---|
172 | |
---|
173 | indices.push_back(0); |
---|
174 | values.push_back(0); |
---|
175 | |
---|
176 | for(ConstColIterator it=b; it!=e; ++it) { |
---|
177 | indices.push_back(it->first); |
---|
178 | values.push_back(it->second); |
---|
179 | } |
---|
180 | |
---|
181 | lpx_set_mat_col(lp, i, values.size() - 1, &indices[0], &values[0]); |
---|
182 | } |
---|
183 | |
---|
184 | void LpGlpk::_getColCoeffs(int i, ColIterator b) const |
---|
185 | { |
---|
186 | int length = lpx_get_mat_col(lp, i, 0, 0); |
---|
187 | |
---|
188 | std::vector<int> indices(length + 1); |
---|
189 | std::vector<Value> values(length + 1); |
---|
190 | |
---|
191 | lpx_get_mat_col(lp, i, &indices[0], &values[0]); |
---|
192 | |
---|
193 | for (int i = 1; i <= length; ++i) { |
---|
194 | *b = std::make_pair(indices[i], values[i]); |
---|
195 | ++b; |
---|
196 | } |
---|
197 | } |
---|
198 | |
---|
199 | void LpGlpk::_setCoeff(int row, int col, Value value) |
---|
200 | { |
---|
201 | |
---|
202 | if (lpx_get_num_cols(lp) < lpx_get_num_rows(lp)) { |
---|
203 | |
---|
204 | int length=lpx_get_mat_row(lp, row, 0, 0); |
---|
205 | |
---|
206 | std::vector<int> indices(length + 2); |
---|
207 | std::vector<Value> values(length + 2); |
---|
208 | |
---|
209 | lpx_get_mat_row(lp, row, &indices[0], &values[0]); |
---|
210 | |
---|
211 | //The following code does not suppose that the elements of the |
---|
212 | //array indices are sorted |
---|
213 | bool found=false; |
---|
214 | for (int i = 1; i <= length; ++i) { |
---|
215 | if (indices[i]==col){ |
---|
216 | found=true; |
---|
217 | values[i]=value; |
---|
218 | break; |
---|
219 | } |
---|
220 | } |
---|
221 | if (!found){ |
---|
222 | ++length; |
---|
223 | indices[length]=col; |
---|
224 | values[length]=value; |
---|
225 | } |
---|
226 | |
---|
227 | lpx_set_mat_row(lp, row, length, &indices[0], &values[0]); |
---|
228 | |
---|
229 | } else { |
---|
230 | |
---|
231 | int length=lpx_get_mat_col(lp, col, 0, 0); |
---|
232 | |
---|
233 | std::vector<int> indices(length + 2); |
---|
234 | std::vector<Value> values(length + 2); |
---|
235 | |
---|
236 | lpx_get_mat_col(lp, col, &indices[0], &values[0]); |
---|
237 | |
---|
238 | //The following code does not suppose that the elements of the |
---|
239 | //array indices are sorted |
---|
240 | bool found=false; |
---|
241 | for (int i = 1; i <= length; ++i) { |
---|
242 | if (indices[i]==col){ |
---|
243 | found=true; |
---|
244 | values[i]=value; |
---|
245 | break; |
---|
246 | } |
---|
247 | } |
---|
248 | if (!found){ |
---|
249 | ++length; |
---|
250 | indices[length]=row; |
---|
251 | values[length]=value; |
---|
252 | } |
---|
253 | |
---|
254 | lpx_set_mat_col(lp, col, length, &indices[0], &values[0]); |
---|
255 | } |
---|
256 | } |
---|
257 | |
---|
258 | LpGlpk::Value LpGlpk::_getCoeff(int row, int col) const |
---|
259 | { |
---|
260 | |
---|
261 | int length=lpx_get_mat_row(lp, row, 0, 0); |
---|
262 | |
---|
263 | std::vector<int> indices(length + 1); |
---|
264 | std::vector<Value> values(length + 1); |
---|
265 | |
---|
266 | lpx_get_mat_row(lp, row, &indices[0], &values[0]); |
---|
267 | |
---|
268 | //The following code does not suppose that the elements of the |
---|
269 | //array indices are sorted |
---|
270 | for (int i = 1; i <= length; ++i) { |
---|
271 | if (indices[i]==col){ |
---|
272 | return values[i]; |
---|
273 | } |
---|
274 | } |
---|
275 | return 0; |
---|
276 | |
---|
277 | } |
---|
278 | |
---|
279 | |
---|
280 | void LpGlpk::_setColLowerBound(int i, Value lo) |
---|
281 | { |
---|
282 | if (lo==INF) { |
---|
283 | //FIXME error |
---|
284 | } |
---|
285 | int b=lpx_get_col_type(lp, i); |
---|
286 | double up=lpx_get_col_ub(lp, i); |
---|
287 | if (lo==-INF) { |
---|
288 | switch (b) { |
---|
289 | case LPX_FR: |
---|
290 | case LPX_LO: |
---|
291 | lpx_set_col_bnds(lp, i, LPX_FR, lo, up); |
---|
292 | break; |
---|
293 | case LPX_UP: |
---|
294 | break; |
---|
295 | case LPX_DB: |
---|
296 | case LPX_FX: |
---|
297 | lpx_set_col_bnds(lp, i, LPX_UP, lo, up); |
---|
298 | break; |
---|
299 | default: ; |
---|
300 | //FIXME error |
---|
301 | } |
---|
302 | } else { |
---|
303 | switch (b) { |
---|
304 | case LPX_FR: |
---|
305 | case LPX_LO: |
---|
306 | lpx_set_col_bnds(lp, i, LPX_LO, lo, up); |
---|
307 | break; |
---|
308 | case LPX_UP: |
---|
309 | case LPX_DB: |
---|
310 | case LPX_FX: |
---|
311 | if (lo==up) |
---|
312 | lpx_set_col_bnds(lp, i, LPX_FX, lo, up); |
---|
313 | else |
---|
314 | lpx_set_col_bnds(lp, i, LPX_DB, lo, up); |
---|
315 | break; |
---|
316 | default: ; |
---|
317 | //FIXME error |
---|
318 | } |
---|
319 | } |
---|
320 | |
---|
321 | } |
---|
322 | |
---|
323 | LpGlpk::Value LpGlpk::_getColLowerBound(int i) const |
---|
324 | { |
---|
325 | int b=lpx_get_col_type(lp, i); |
---|
326 | switch (b) { |
---|
327 | case LPX_LO: |
---|
328 | case LPX_DB: |
---|
329 | case LPX_FX: |
---|
330 | return lpx_get_col_lb(lp, i); |
---|
331 | default: ; |
---|
332 | return -INF; |
---|
333 | } |
---|
334 | } |
---|
335 | |
---|
336 | void LpGlpk::_setColUpperBound(int i, Value up) |
---|
337 | { |
---|
338 | if (up==-INF) { |
---|
339 | //FIXME error |
---|
340 | } |
---|
341 | int b=lpx_get_col_type(lp, i); |
---|
342 | double lo=lpx_get_col_lb(lp, i); |
---|
343 | if (up==INF) { |
---|
344 | switch (b) { |
---|
345 | case LPX_FR: |
---|
346 | case LPX_LO: |
---|
347 | break; |
---|
348 | case LPX_UP: |
---|
349 | lpx_set_col_bnds(lp, i, LPX_FR, lo, up); |
---|
350 | break; |
---|
351 | case LPX_DB: |
---|
352 | case LPX_FX: |
---|
353 | lpx_set_col_bnds(lp, i, LPX_LO, lo, up); |
---|
354 | break; |
---|
355 | default: ; |
---|
356 | //FIXME error |
---|
357 | } |
---|
358 | } else { |
---|
359 | switch (b) { |
---|
360 | case LPX_FR: |
---|
361 | lpx_set_col_bnds(lp, i, LPX_UP, lo, up); |
---|
362 | break; |
---|
363 | case LPX_UP: |
---|
364 | lpx_set_col_bnds(lp, i, LPX_UP, lo, up); |
---|
365 | break; |
---|
366 | case LPX_LO: |
---|
367 | case LPX_DB: |
---|
368 | case LPX_FX: |
---|
369 | if (lo==up) |
---|
370 | lpx_set_col_bnds(lp, i, LPX_FX, lo, up); |
---|
371 | else |
---|
372 | lpx_set_col_bnds(lp, i, LPX_DB, lo, up); |
---|
373 | break; |
---|
374 | default: ; |
---|
375 | //FIXME error |
---|
376 | } |
---|
377 | } |
---|
378 | } |
---|
379 | |
---|
380 | LpGlpk::Value LpGlpk::_getColUpperBound(int i) const |
---|
381 | { |
---|
382 | int b=lpx_get_col_type(lp, i); |
---|
383 | switch (b) { |
---|
384 | case LPX_UP: |
---|
385 | case LPX_DB: |
---|
386 | case LPX_FX: |
---|
387 | return lpx_get_col_ub(lp, i); |
---|
388 | default: ; |
---|
389 | return INF; |
---|
390 | } |
---|
391 | } |
---|
392 | |
---|
393 | void LpGlpk::_setRowBounds(int i, Value lb, Value ub) |
---|
394 | { |
---|
395 | //Bad parameter |
---|
396 | if (lb==INF || ub==-INF) { |
---|
397 | //FIXME error |
---|
398 | } |
---|
399 | |
---|
400 | if (lb == -INF){ |
---|
401 | if (ub == INF){ |
---|
402 | lpx_set_row_bnds(lp, i, LPX_FR, lb, ub); |
---|
403 | } |
---|
404 | else{ |
---|
405 | lpx_set_row_bnds(lp, i, LPX_UP, lb, ub); |
---|
406 | } |
---|
407 | } |
---|
408 | else{ |
---|
409 | if (ub==INF){ |
---|
410 | lpx_set_row_bnds(lp, i, LPX_LO, lb, ub); |
---|
411 | |
---|
412 | } |
---|
413 | else{ |
---|
414 | if (lb == ub){ |
---|
415 | lpx_set_row_bnds(lp, i, LPX_FX, lb, ub); |
---|
416 | } |
---|
417 | else{ |
---|
418 | lpx_set_row_bnds(lp, i, LPX_DB, lb, ub); |
---|
419 | } |
---|
420 | } |
---|
421 | } |
---|
422 | |
---|
423 | } |
---|
424 | |
---|
425 | void LpGlpk::_getRowBounds(int i, Value &lb, Value &ub) const |
---|
426 | { |
---|
427 | |
---|
428 | int b=lpx_get_row_type(lp, i); |
---|
429 | switch (b) { |
---|
430 | case LPX_FR: |
---|
431 | case LPX_UP: |
---|
432 | lb = -INF; |
---|
433 | break; |
---|
434 | default: |
---|
435 | lb=lpx_get_row_lb(lp, i); |
---|
436 | } |
---|
437 | |
---|
438 | switch (b) { |
---|
439 | case LPX_FR: |
---|
440 | case LPX_LO: |
---|
441 | ub = INF; |
---|
442 | break; |
---|
443 | default: |
---|
444 | ub=lpx_get_row_ub(lp, i); |
---|
445 | } |
---|
446 | |
---|
447 | } |
---|
448 | |
---|
449 | void LpGlpk::_setObjCoeff(int i, Value obj_coef) |
---|
450 | { |
---|
451 | //i=0 means the constant term (shift) |
---|
452 | lpx_set_obj_coef(lp, i, obj_coef); |
---|
453 | } |
---|
454 | |
---|
455 | LpGlpk::Value LpGlpk::_getObjCoeff(int i) const { |
---|
456 | //i=0 means the constant term (shift) |
---|
457 | return lpx_get_obj_coef(lp, i); |
---|
458 | } |
---|
459 | |
---|
460 | void LpGlpk::_clearObj() |
---|
461 | { |
---|
462 | for (int i=0;i<=lpx_get_num_cols(lp);++i){ |
---|
463 | lpx_set_obj_coef(lp, i, 0); |
---|
464 | } |
---|
465 | } |
---|
466 | |
---|
467 | LpGlpk::SolveExitStatus LpGlpk::_solve() |
---|
468 | { |
---|
469 | // A way to check the problem to be solved |
---|
470 | //lpx_write_cpxlp(lp,"naittvan.cpx"); |
---|
471 | |
---|
472 | lpx_std_basis(lp); |
---|
473 | int i = lpx_simplex(lp); |
---|
474 | |
---|
475 | switch (i) { |
---|
476 | case LPX_E_OK: |
---|
477 | return SOLVED; |
---|
478 | default: |
---|
479 | return UNSOLVED; |
---|
480 | } |
---|
481 | } |
---|
482 | |
---|
483 | LpGlpk::Value LpGlpk::_getPrimal(int i) const |
---|
484 | { |
---|
485 | return lpx_get_col_prim(lp,i); |
---|
486 | } |
---|
487 | |
---|
488 | LpGlpk::Value LpGlpk::_getDual(int i) const |
---|
489 | { |
---|
490 | return lpx_get_row_dual(lp,i); |
---|
491 | } |
---|
492 | |
---|
493 | LpGlpk::Value LpGlpk::_getPrimalValue() const |
---|
494 | { |
---|
495 | return lpx_get_obj_val(lp); |
---|
496 | } |
---|
497 | bool LpGlpk::_isBasicCol(int i) const |
---|
498 | { |
---|
499 | return (lpx_get_col_stat(lp, i)==LPX_BS); |
---|
500 | } |
---|
501 | |
---|
502 | |
---|
503 | LpGlpk::SolutionStatus LpGlpk::_getPrimalStatus() const |
---|
504 | { |
---|
505 | int stat= lpx_get_status(lp); |
---|
506 | switch (stat) { |
---|
507 | case LPX_UNDEF://Undefined (no solve has been run yet) |
---|
508 | return UNDEFINED; |
---|
509 | case LPX_NOFEAS://There is no feasible solution (primal, I guess) |
---|
510 | case LPX_INFEAS://Infeasible |
---|
511 | return INFEASIBLE; |
---|
512 | case LPX_UNBND://Unbounded |
---|
513 | return INFINITE; |
---|
514 | case LPX_FEAS://Feasible |
---|
515 | return FEASIBLE; |
---|
516 | case LPX_OPT://Feasible |
---|
517 | return OPTIMAL; |
---|
518 | default: |
---|
519 | return UNDEFINED; //to avoid gcc warning |
---|
520 | //FIXME error |
---|
521 | } |
---|
522 | } |
---|
523 | |
---|
524 | LpGlpk::SolutionStatus LpGlpk::_getDualStatus() const |
---|
525 | { |
---|
526 | switch (lpx_get_dual_stat(lp)) { |
---|
527 | case LPX_D_UNDEF://Undefined (no solve has been run yet) |
---|
528 | return UNDEFINED; |
---|
529 | case LPX_D_NOFEAS://There is no dual feasible solution |
---|
530 | // case LPX_D_INFEAS://Infeasible |
---|
531 | return INFEASIBLE; |
---|
532 | case LPX_D_FEAS://Feasible |
---|
533 | switch (lpx_get_status(lp)) { |
---|
534 | case LPX_NOFEAS: |
---|
535 | return INFINITE; |
---|
536 | case LPX_OPT: |
---|
537 | return OPTIMAL; |
---|
538 | default: |
---|
539 | return FEASIBLE; |
---|
540 | } |
---|
541 | default: |
---|
542 | return UNDEFINED; //to avoid gcc warning |
---|
543 | //FIXME error |
---|
544 | } |
---|
545 | } |
---|
546 | |
---|
547 | LpGlpk::ProblemTypes LpGlpk::_getProblemType() const |
---|
548 | { |
---|
549 | //int stat= lpx_get_status(lp); |
---|
550 | int statp= lpx_get_prim_stat(lp); |
---|
551 | int statd= lpx_get_dual_stat(lp); |
---|
552 | if (statp==LPX_P_FEAS && statd==LPX_D_FEAS) |
---|
553 | return PRIMAL_DUAL_FEASIBLE; |
---|
554 | if (statp==LPX_P_FEAS && statd==LPX_D_NOFEAS) |
---|
555 | return PRIMAL_FEASIBLE_DUAL_INFEASIBLE; |
---|
556 | if (statp==LPX_P_NOFEAS && statd==LPX_D_FEAS) |
---|
557 | return PRIMAL_INFEASIBLE_DUAL_FEASIBLE; |
---|
558 | if (statp==LPX_P_NOFEAS && statd==LPX_D_NOFEAS) |
---|
559 | return PRIMAL_DUAL_INFEASIBLE; |
---|
560 | //In all other cases |
---|
561 | return UNKNOWN; |
---|
562 | } |
---|
563 | |
---|
564 | void LpGlpk::_setMax() |
---|
565 | { |
---|
566 | lpx_set_obj_dir(lp, LPX_MAX); |
---|
567 | } |
---|
568 | |
---|
569 | void LpGlpk::_setMin() |
---|
570 | { |
---|
571 | lpx_set_obj_dir(lp, LPX_MIN); |
---|
572 | } |
---|
573 | |
---|
574 | bool LpGlpk::_isMax() const |
---|
575 | { |
---|
576 | return (lpx_get_obj_dir(lp)==LPX_MAX); |
---|
577 | } |
---|
578 | |
---|
579 | |
---|
580 | |
---|
581 | void LpGlpk::messageLevel(int m) |
---|
582 | { |
---|
583 | lpx_set_int_parm(lp, LPX_K_MSGLEV, m); |
---|
584 | } |
---|
585 | |
---|
586 | void LpGlpk::presolver(bool b) |
---|
587 | { |
---|
588 | lpx_set_int_parm(lp, LPX_K_PRESOL, b); |
---|
589 | } |
---|
590 | |
---|
591 | |
---|
592 | } //END OF NAMESPACE LEMON |
---|