Scippy

SCIP

Solving Constraint Integer Programs

lpi_none.c
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1 /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
2 /* */
3 /* This file is part of the program and library */
4 /* SCIP --- Solving Constraint Integer Programs */
5 /* */
6 /* Copyright (C) 2002-2016 Konrad-Zuse-Zentrum */
7 /* fuer Informationstechnik Berlin */
8 /* */
9 /* SCIP is distributed under the terms of the ZIB Academic License. */
10 /* */
11 /* You should have received a copy of the ZIB Academic License */
12 /* along with SCIP; see the file COPYING. If not email to scip@zib.de. */
13 /* */
14 /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
15 
16 /**@file lpi_none.c
17  * @ingroup LPIS
18  * @brief dummy interface for the case no LP solver is needed
19  * @author Stefan Heinz
20  */
21 
22 /*--+----1----+----2----+----3----+----4----+----5----+----6----+----7----+----8----+----9----+----0----+----1----+----2*/
23 
24 #include <assert.h>
25 
26 #include "lpi/lpi.h"
27 #include "scip/pub_message.h"
28 
29 #define LPINAME "NONE" /**< name of the LPI interface */
30 #define LPIINFINITY 1e20 /**< infinity value */
31 
32 /** LP interface
33  *
34  * Store several statistic values about the LP. These values are only needed in order to provide a rudimentary
35  * communication, e.g., there are asserts that check the number of rows and columns.
36  */
37 struct SCIP_LPi
38 {
39  int nrows; /**< number of rows */
40  int ncols; /**< number of columns */
41 };
42 
43 
44 /*
45  * Local Methods
46  */
47 
48 /** error handling method */
49 static
50 void errorMessageAbort(
51  void
52  )
53 {
54  SCIPerrorMessage("No LP solver available (LPS=none).\n");
55  SCIPerrorMessage("Ensure <lp/solvefreq = -1>; note that continuous variables might require an LP-solver.\n");
56  SCIPABORT();
57 }
58 
59 /** error handling method */
60 static
61 void errorMessage(
62  void
63  )
64 {
65  SCIPerrorMessage("No LP solver available (LPS=none).\n");
66  SCIPerrorMessage("Ensure <lp/solvefreq = -1>; note that continuous variables might require an LP-solver.\n");
67 }
68 
69 /*
70  * LP Interface Methods
71  */
72 
73 
74 /*
75  * Miscellaneous Methods
76  */
77 
78 /**@name Miscellaneous Methods */
79 /**@{ */
80 
81 /** gets name and version of LP solver */
83  void
84  )
85 {
86  return LPINAME;
87 }
88 
89 /** gets description of LP solver (developer, webpage, ...) */
91  void
92  )
93 {
94  return "dummy LP solver interface which solely purpose is to resolve references at linking";
95 }
96 
97 /** gets pointer for LP solver - use only with great care */
99  SCIP_LPI* lpi /**< pointer to an LP interface structure */
100  )
101 { /*lint --e{715}*/
102  return (void*) NULL;
103 }
104 /**@} */
105 
106 
107 
108 
109 /*
110  * LPI Creation and Destruction Methods
111  */
112 
113 /**@name LPI Creation and Destruction Methods */
114 /**@{ */
115 
116 /** creates an LP problem object */
118  SCIP_LPI** lpi, /**< pointer to an LP interface structure */
119  SCIP_MESSAGEHDLR* messagehdlr, /**< message handler to use for printing messages, or NULL */
120  const char* name, /**< problem name */
121  SCIP_OBJSEN objsen /**< objective sense */
122  )
123 { /*lint --e{715}*/
124  assert(lpi != NULL);
125  SCIPdebugMessage("SCIPlpiCreate()\n");
126  SCIPdebugMessage("Note that there is no LP solver linked to the binary\n");
127 
128  /* create empty LPI */
129  SCIP_ALLOC( BMSallocMemory(lpi) );
130  (*lpi)->nrows = 0;
131  (*lpi)->ncols = 0;
132 
133  return SCIP_OKAY;
134 }
135 
136 /** deletes an LP problem object */
138  SCIP_LPI** lpi /**< pointer to an LP interface structure */
139  )
140 { /*lint --e{715}*/
141  assert( lpi != NULL );
142  SCIPdebugMessage("SCIPlpiFree()\n");
143 
144  BMSfreeMemory(lpi);
145 
146  return SCIP_OKAY;
147 }
148 
149 /**@} */
150 
151 
152 
153 
154 /*
155  * Modification Methods
156  */
157 
158 /**@name Modification Methods */
159 /**@{ */
160 
161 /** copies LP data with column matrix into LP solver */
163  SCIP_LPI* lpi, /**< LP interface structure */
164  SCIP_OBJSEN objsen, /**< objective sense */
165  int ncols, /**< number of columns */
166  const SCIP_Real* obj, /**< objective function values of columns */
167  const SCIP_Real* lb, /**< lower bounds of columns */
168  const SCIP_Real* ub, /**< upper bounds of columns */
169  char** colnames, /**< column names, or NULL */
170  int nrows, /**< number of rows */
171  const SCIP_Real* lhs, /**< left hand sides of rows */
172  const SCIP_Real* rhs, /**< right hand sides of rows */
173  char** rownames, /**< row names, or NULL */
174  int nnonz, /**< number of nonzero elements in the constraint matrix */
175  const int* beg, /**< start index of each column in ind- and val-array */
176  const int* ind, /**< row indices of constraint matrix entries */
177  const SCIP_Real* val /**< values of constraint matrix entries */
178  )
179 { /*lint --e{715}*/
180  assert( lpi != NULL );
181 
182  lpi->nrows = nrows;
183  lpi->ncols = ncols;
184  assert( lpi->nrows >= 0 );
185  assert( lpi->ncols >= 0 );
186 
187  return SCIP_OKAY;
188 }
189 
190 /** adds columns to the LP */
192  SCIP_LPI* lpi, /**< LP interface structure */
193  int ncols, /**< number of columns to be added */
194  const SCIP_Real* obj, /**< objective function values of new columns */
195  const SCIP_Real* lb, /**< lower bounds of new columns */
196  const SCIP_Real* ub, /**< upper bounds of new columns */
197  char** colnames, /**< column names, or NULL */
198  int nnonz, /**< number of nonzero elements to be added to the constraint matrix */
199  const int* beg, /**< start index of each column in ind- and val-array, or NULL if nnonz == 0 */
200  const int* ind, /**< row indices of constraint matrix entries, or NULL if nnonz == 0 */
201  const SCIP_Real* val /**< values of constraint matrix entries, or NULL if nnonz == 0 */
202  )
203 { /*lint --e{715}*/
204  assert( lpi != NULL );
205  assert( lpi->ncols >= 0 );
206 
207  lpi->ncols += ncols;
208 
209  return SCIP_OKAY;
210 }
211 
212 /** deletes all columns in the given range from LP */
214  SCIP_LPI* lpi, /**< LP interface structure */
215  int firstcol, /**< first column to be deleted */
216  int lastcol /**< last column to be deleted */
217  )
218 { /*lint --e{715}*/
219  assert( lpi != NULL );
220  assert( lpi->ncols >= 0 );
221 
222  lpi->ncols -= lastcol - firstcol + 1;
223  assert( lpi->ncols >= 0 );
224 
225  return SCIP_OKAY;
226 }
227 
228 /** deletes columns from SCIP_LP; the new position of a column must not be greater that its old position */
230  SCIP_LPI* lpi, /**< LP interface structure */
231  int* dstat /**< deletion status of columns
232  * input: 1 if column should be deleted, 0 if not
233  * output: new position of column, -1 if column was deleted */
234  )
235 { /*lint --e{715}*/
236  int cnt = 0;
237  int j;
238 
239  assert( lpi != NULL );
240  assert( dstat != NULL );
241  assert( lpi->ncols >= 0 );
242 
243  for (j = 0; j < lpi->ncols; ++j)
244  {
245  if ( dstat[j] )
246  {
247  ++cnt;
248  dstat[j] = -1;
249  }
250  else
251  dstat[j] = cnt;
252  }
253  lpi->ncols -= cnt;
254  assert( lpi->ncols >= 0 );
255 
256  return SCIP_OKAY;
257 }
258 
259 /** adds rows to the LP */
261  SCIP_LPI* lpi, /**< LP interface structure */
262  int nrows, /**< number of rows to be added */
263  const SCIP_Real* lhs, /**< left hand sides of new rows */
264  const SCIP_Real* rhs, /**< right hand sides of new rows */
265  char** rownames, /**< row names, or NULL */
266  int nnonz, /**< number of nonzero elements to be added to the constraint matrix */
267  const int* beg, /**< start index of each row in ind- and val-array, or NULL if nnonz == 0 */
268  const int* ind, /**< column indices of constraint matrix entries, or NULL if nnonz == 0 */
269  const SCIP_Real* val /**< values of constraint matrix entries, or NULL if nnonz == 0 */
270  )
271 { /*lint --e{715}*/
272  assert( lpi != NULL );
273  assert( lpi->nrows >= 0 );
274 
275  lpi->nrows += nrows;
276 
277  return SCIP_OKAY;
278 }
279 
280 /** deletes all rows in the given range from LP */
282  SCIP_LPI* lpi, /**< LP interface structure */
283  int firstrow, /**< first row to be deleted */
284  int lastrow /**< last row to be deleted */
285  )
286 { /*lint --e{715}*/
287  assert( lpi != NULL );
288  assert( lpi->nrows >= 0 );
289 
290  lpi->nrows -= lastrow - firstrow + 1;
291  assert( lpi->nrows >= 0 );
292 
293  return SCIP_OKAY;
294 }
295 
296 /** deletes rows from SCIP_LP; the new position of a row must not be greater that its old position */
298  SCIP_LPI* lpi, /**< LP interface structure */
299  int* dstat /**< deletion status of rows
300  * input: 1 if row should be deleted, 0 if not
301  * output: new position of row, -1 if row was deleted */
302  )
303 { /*lint --e{715}*/
304  int cnt = 0;
305  int i;
306 
307  assert( lpi != NULL );
308  assert( dstat != NULL );
309  assert( lpi->nrows >= 0 );
310 
311  for (i = 0; i < lpi->nrows; ++i)
312  {
313  if ( dstat[i] )
314  {
315  ++cnt;
316  dstat[i] = -1;
317  }
318  else
319  dstat[i] = cnt;
320  }
321  lpi->nrows -= cnt;
322  assert( lpi->nrows >= 0 );
323 
324  return SCIP_OKAY;
325 }
326 
327 /** clears the whole LP */
329  SCIP_LPI* lpi /**< LP interface structure */
330  )
331 { /*lint --e{715}*/
332  assert( lpi != NULL );
333  assert( lpi->nrows >= 0 );
334  assert( lpi->ncols >= 0 );
335 
336  lpi->nrows = 0;
337  lpi->ncols = 0;
338 
339  return SCIP_OKAY;
340 }
341 
342 /** changes lower and upper bounds of columns */
344  SCIP_LPI* lpi, /**< LP interface structure */
345  int ncols, /**< number of columns to change bounds for */
346  const int* ind, /**< column indices */
347  const SCIP_Real* lb, /**< values for the new lower bounds */
348  const SCIP_Real* ub /**< values for the new upper bounds */
349  )
350 { /*lint --e{715}*/
351  return SCIP_OKAY;
352 }
353 
354 /** changes left and right hand sides of rows */
356  SCIP_LPI* lpi, /**< LP interface structure */
357  int nrows, /**< number of rows to change sides for */
358  const int* ind, /**< row indices */
359  const SCIP_Real* lhs, /**< new values for left hand sides */
360  const SCIP_Real* rhs /**< new values for right hand sides */
361  )
362 { /*lint --e{715}*/
363  return SCIP_OKAY;
364 }
365 
366 /** changes a single coefficient */
368  SCIP_LPI* lpi, /**< LP interface structure */
369  int row, /**< row number of coefficient to change */
370  int col, /**< column number of coefficient to change */
371  SCIP_Real newval /**< new value of coefficient */
372  )
373 { /*lint --e{715}*/
374  return SCIP_OKAY;
375 }
376 
377 /** changes the objective sense */
379  SCIP_LPI* lpi, /**< LP interface structure */
380  SCIP_OBJSEN objsen /**< new objective sense */
381  )
382 { /*lint --e{715}*/
383  return SCIP_OKAY;
384 }
385 
386 /** changes objective values of columns in the LP */
388  SCIP_LPI* lpi, /**< LP interface structure */
389  int ncols, /**< number of columns to change objective value for */
390  int* ind, /**< column indices to change objective value for */
391  SCIP_Real* obj /**< new objective values for columns */
392  )
393 { /*lint --e{715}*/
394  return SCIP_OKAY;
395 }
396 
397 /** multiplies a row with a non-zero scalar; for negative scalars, the row's sense is switched accordingly */
399  SCIP_LPI* lpi, /**< LP interface structure */
400  int row, /**< row number to scale */
401  SCIP_Real scaleval /**< scaling multiplier */
402  )
403 { /*lint --e{715}*/
404  return SCIP_OKAY;
405 }
406 
407 /** multiplies a column with a non-zero scalar; the objective value is multiplied with the scalar, and the bounds
408  * are divided by the scalar; for negative scalars, the column's bounds are switched
409  */
411  SCIP_LPI* lpi, /**< LP interface structure */
412  int col, /**< column number to scale */
413  SCIP_Real scaleval /**< scaling multiplier */
414  )
415 { /*lint --e{715}*/
416  return SCIP_OKAY;
417 }
418 
419 /**@} */
420 
421 
422 
423 
424 /*
425  * Data Accessing Methods
426  */
427 
428 /**@name Data Accessing Methods */
429 /**@{ */
430 
431 /** gets the number of rows in the LP */
433  SCIP_LPI* lpi, /**< LP interface structure */
434  int* nrows /**< pointer to store the number of rows */
435  )
436 { /*lint --e{715}*/
437  assert( lpi != NULL );
438  assert( nrows != NULL );
439  assert( lpi->nrows >= 0 );
440 
441  *nrows = lpi->nrows;
442 
443  return SCIP_OKAY;
444 }
445 
446 /** gets the number of columns in the LP */
448  SCIP_LPI* lpi, /**< LP interface structure */
449  int* ncols /**< pointer to store the number of cols */
450  )
451 { /*lint --e{715}*/
452  assert( lpi != NULL );
453  assert( ncols != NULL );
454  assert( lpi->ncols >= 0 );
455 
456  *ncols = lpi->ncols;
457 
458  return SCIP_OKAY;
459 }
460 
461 /** gets the number of nonzero elements in the LP constraint matrix */
463  SCIP_LPI* lpi, /**< LP interface structure */
464  int* nnonz /**< pointer to store the number of nonzeros */
465  )
466 { /*lint --e{715}*/
467  assert(nnonz != NULL);
468  errorMessage();
469  return SCIP_PLUGINNOTFOUND;
470 }
471 
472 /** gets columns from LP problem object; the arrays have to be large enough to store all values
473  * Either both, lb and ub, have to be NULL, or both have to be non-NULL,
474  * either nnonz, beg, ind, and val have to be NULL, or all of them have to be non-NULL.
475  */
477  SCIP_LPI* lpi, /**< LP interface structure */
478  int firstcol, /**< first column to get from LP */
479  int lastcol, /**< last column to get from LP */
480  SCIP_Real* lb, /**< buffer to store the lower bound vector, or NULL */
481  SCIP_Real* ub, /**< buffer to store the upper bound vector, or NULL */
482  int* nnonz, /**< pointer to store the number of nonzero elements returned, or NULL */
483  int* beg, /**< buffer to store start index of each column in ind- and val-array, or NULL */
484  int* ind, /**< buffer to store column indices of constraint matrix entries, or NULL */
485  SCIP_Real* val /**< buffer to store values of constraint matrix entries, or NULL */
486  )
487 { /*lint --e{715}*/
488  errorMessage();
489  return SCIP_PLUGINNOTFOUND;
490 }
491 
492 /** gets rows from LP problem object; the arrays have to be large enough to store all values.
493  * Either both, lhs and rhs, have to be NULL, or both have to be non-NULL,
494  * either nnonz, beg, ind, and val have to be NULL, or all of them have to be non-NULL.
495  */
497  SCIP_LPI* lpi, /**< LP interface structure */
498  int firstrow, /**< first row to get from LP */
499  int lastrow, /**< last row to get from LP */
500  SCIP_Real* lhs, /**< buffer to store left hand side vector, or NULL */
501  SCIP_Real* rhs, /**< buffer to store right hand side vector, or NULL */
502  int* nnonz, /**< pointer to store the number of nonzero elements returned, or NULL */
503  int* beg, /**< buffer to store start index of each row in ind- and val-array, or NULL */
504  int* ind, /**< buffer to store row indices of constraint matrix entries, or NULL */
505  SCIP_Real* val /**< buffer to store values of constraint matrix entries, or NULL */
506  )
507 { /*lint --e{715}*/
508  errorMessage();
509  return SCIP_PLUGINNOTFOUND;
510 }
511 
512 /** gets column names */
514  SCIP_LPI* lpi, /**< LP interface structure */
515  int firstcol, /**< first column to get name from LP */
516  int lastcol, /**< last column to get name from LP */
517  char** colnames, /**< pointers to column names (of size at least lastcol-firstcol+1) */
518  char* namestorage, /**< storage for col names */
519  int namestoragesize, /**< size of namestorage (if 0, storageleft returns the storage needed) */
520  int* storageleft /**< amount of storage left (if < 0 the namestorage was not big enough) */
521  )
522 {
523  errorMessage();
524  return SCIP_PLUGINNOTFOUND;
525 }
526 
527 /** gets row names */
529  SCIP_LPI* lpi, /**< LP interface structure */
530  int firstrow, /**< first row to get name from LP */
531  int lastrow, /**< last row to get name from LP */
532  char** rownames, /**< pointers to row names (of size at least lastrow-firstrow+1) */
533  char* namestorage, /**< storage for row names */
534  int namestoragesize, /**< size of namestorage (if 0, -storageleft returns the storage needed) */
535  int* storageleft /**< amount of storage left (if < 0 the namestorage was not big enough) */
536  )
537 {
538  errorMessage();
539  return SCIP_PLUGINNOTFOUND;
540 }
541 
542 /** gets the objective sense of the LP */
544  SCIP_LPI* lpi, /**< LP interface structure */
545  SCIP_OBJSEN* objsen /**< pointer to store objective sense */
546  )
547 { /*lint --e{715}*/
548  errorMessage();
549  return SCIP_PLUGINNOTFOUND;
550 }
551 
552 /** gets objective coefficients from LP problem object */
554  SCIP_LPI* lpi, /**< LP interface structure */
555  int firstcol, /**< first column to get objective coefficient for */
556  int lastcol, /**< last column to get objective coefficient for */
557  SCIP_Real* vals /**< array to store objective coefficients */
558  )
559 { /*lint --e{715}*/
560  errorMessage();
561  return SCIP_PLUGINNOTFOUND;
562 }
563 
564 /** gets current bounds from LP problem object */
566  SCIP_LPI* lpi, /**< LP interface structure */
567  int firstcol, /**< first column to get bounds for */
568  int lastcol, /**< last column to get bounds for */
569  SCIP_Real* lbs, /**< array to store lower bound values, or NULL */
570  SCIP_Real* ubs /**< array to store upper bound values, or NULL */
571  )
572 { /*lint --e{715}*/
573  errorMessage();
574  return SCIP_PLUGINNOTFOUND;
575 }
576 
577 /** gets current row sides from LP problem object */
579  SCIP_LPI* lpi, /**< LP interface structure */
580  int firstrow, /**< first row to get sides for */
581  int lastrow, /**< last row to get sides for */
582  SCIP_Real* lhss, /**< array to store left hand side values, or NULL */
583  SCIP_Real* rhss /**< array to store right hand side values, or NULL */
584  )
585 { /*lint --e{715}*/
586  assert(firstrow <= lastrow);
587  errorMessage();
588  return SCIP_PLUGINNOTFOUND;
589 }
590 
591 /** gets a single coefficient */
593  SCIP_LPI* lpi, /**< LP interface structure */
594  int row, /**< row number of coefficient */
595  int col, /**< column number of coefficient */
596  SCIP_Real* val /**< pointer to store the value of the coefficient */
597  )
598 { /*lint --e{715}*/
599  errorMessage();
600  return SCIP_PLUGINNOTFOUND;
601 }
602 
603 /**@} */
604 
605 
606 
607 
608 /*
609  * Solving Methods
610  */
611 
612 /**@name Solving Methods */
613 /**@{ */
614 
615 /** calls primal simplex to solve the LP */
617  SCIP_LPI* lpi /**< LP interface structure */
618  )
619 { /*lint --e{715}*/
620  errorMessage();
621  return SCIP_PLUGINNOTFOUND;
622 }
623 
624 /** calls dual simplex to solve the LP */
626  SCIP_LPI* lpi /**< LP interface structure */
627  )
628 { /*lint --e{715}*/
629  errorMessage();
630  return SCIP_PLUGINNOTFOUND;
631 }
632 
633 /** calls barrier or interior point algorithm to solve the LP with crossover to simplex basis */
635  SCIP_LPI* lpi, /**< LP interface structure */
636  SCIP_Bool crossover /**< perform crossover */
637  )
638 { /*lint --e{715}*/
639  errorMessage();
640  return SCIP_PLUGINNOTFOUND;
641 }
642 
643 /** start strong branching - call before any strong branching */
645  SCIP_LPI* lpi /**< LP interface structure */
646  )
647 { /*lint --e{715}*/
648  assert( lpi != NULL);
649  return SCIP_OKAY;
650 }
651 
652 /** end strong branching - call after any strong branching */
654  SCIP_LPI* lpi /**< LP interface structure */
655  )
656 { /*lint --e{715}*/
657  assert( lpi != NULL);
658  return SCIP_OKAY;
659 }
660 
661 /** performs strong branching iterations on one @b fractional candidate */
663  SCIP_LPI* lpi, /**< LP interface structure */
664  int col, /**< column to apply strong branching on */
665  SCIP_Real psol, /**< fractional current primal solution value of column */
666  int itlim, /**< iteration limit for strong branchings */
667  SCIP_Real* down, /**< stores dual bound after branching column down */
668  SCIP_Real* up, /**< stores dual bound after branching column up */
669  SCIP_Bool* downvalid, /**< stores whether the returned down value is a valid dual bound;
670  * otherwise, it can only be used as an estimate value */
671  SCIP_Bool* upvalid, /**< stores whether the returned up value is a valid dual bound;
672  * otherwise, it can only be used as an estimate value */
673  int* iter /**< stores total number of strong branching iterations, or -1; may be NULL */
674  )
675 { /*lint --e{715}*/
676  assert( down != NULL );
677  assert( up != NULL );
678  assert( downvalid != NULL );
679  assert( upvalid != NULL );
680  errorMessage();
681  return SCIP_PLUGINNOTFOUND;
682 }
683 
684 /** performs strong branching iterations on given @b fractional candidates */
686  SCIP_LPI* lpi, /**< LP interface structure */
687  int* cols, /**< columns to apply strong branching on */
688  int ncols, /**< number of columns */
689  SCIP_Real* psols, /**< fractional current primal solution values of columns */
690  int itlim, /**< iteration limit for strong branchings */
691  SCIP_Real* down, /**< stores dual bounds after branching columns down */
692  SCIP_Real* up, /**< stores dual bounds after branching columns up */
693  SCIP_Bool* downvalid, /**< stores whether the returned down values are valid dual bounds;
694  * otherwise, they can only be used as an estimate values */
695  SCIP_Bool* upvalid, /**< stores whether the returned up values are a valid dual bounds;
696  * otherwise, they can only be used as an estimate values */
697  int* iter /**< stores total number of strong branching iterations, or -1; may be NULL */
698  )
699 { /*lint --e{715}*/
700  assert( cols != NULL );
701  assert( psols != NULL );
702  assert( down != NULL );
703  assert( up != NULL );
704  assert( downvalid != NULL );
705  assert( upvalid != NULL );
706  errorMessage();
707  return SCIP_PLUGINNOTFOUND;
708 }
709 
710 /** performs strong branching iterations on one candidate with @b integral value */
712  SCIP_LPI* lpi, /**< LP interface structure */
713  int col, /**< column to apply strong branching on */
714  SCIP_Real psol, /**< current integral primal solution value of column */
715  int itlim, /**< iteration limit for strong branchings */
716  SCIP_Real* down, /**< stores dual bound after branching column down */
717  SCIP_Real* up, /**< stores dual bound after branching column up */
718  SCIP_Bool* downvalid, /**< stores whether the returned down value is a valid dual bound;
719  * otherwise, it can only be used as an estimate value */
720  SCIP_Bool* upvalid, /**< stores whether the returned up value is a valid dual bound;
721  * otherwise, it can only be used as an estimate value */
722  int* iter /**< stores total number of strong branching iterations, or -1; may be NULL */
723  )
724 { /*lint --e{715}*/
725  assert( down != NULL );
726  assert( up != NULL );
727  assert( downvalid != NULL );
728  assert( upvalid != NULL );
729  errorMessage();
730  return SCIP_PLUGINNOTFOUND;
731 }
732 
733 /** performs strong branching iterations on given candidates with @b integral values */
735  SCIP_LPI* lpi, /**< LP interface structure */
736  int* cols, /**< columns to apply strong branching on */
737  int ncols, /**< number of columns */
738  SCIP_Real* psols, /**< current integral primal solution values of columns */
739  int itlim, /**< iteration limit for strong branchings */
740  SCIP_Real* down, /**< stores dual bounds after branching columns down */
741  SCIP_Real* up, /**< stores dual bounds after branching columns up */
742  SCIP_Bool* downvalid, /**< stores whether the returned down values are valid dual bounds;
743  * otherwise, they can only be used as an estimate values */
744  SCIP_Bool* upvalid, /**< stores whether the returned up values are a valid dual bounds;
745  * otherwise, they can only be used as an estimate values */
746  int* iter /**< stores total number of strong branching iterations, or -1; may be NULL */
747  )
748 { /*lint --e{715}*/
749  assert( cols != NULL );
750  assert( psols != NULL );
751  assert( down != NULL );
752  assert( up != NULL );
753  assert( downvalid != NULL );
754  assert( upvalid != NULL );
755  errorMessage();
756  return SCIP_PLUGINNOTFOUND;
757 }
758 /**@} */
759 
760 
761 
762 
763 /*
764  * Solution Information Methods
765  */
766 
767 /**@name Solution Information Methods */
768 /**@{ */
769 
770 /** returns whether a solve method was called after the last modification of the LP */
772  SCIP_LPI* lpi /**< LP interface structure */
773  )
774 { /*lint --e{715}*/
775  errorMessageAbort();
776  return FALSE;
777 }
778 
779 /** gets information about primal and dual feasibility of the current LP solution */
781  SCIP_LPI* lpi, /**< LP interface structure */
782  SCIP_Bool* primalfeasible, /**< stores primal feasibility status */
783  SCIP_Bool* dualfeasible /**< stores dual feasibility status */
784  )
785 { /*lint --e{715}*/
786  assert(primalfeasible != NULL);
787  assert(dualfeasible != NULL);
788  errorMessage();
789  return SCIP_PLUGINNOTFOUND;
790 }
791 
792 /** returns TRUE iff LP is proven to have a primal unbounded ray (but not necessary a primal feasible point);
793  * this does not necessarily mean, that the solver knows and can return the primal ray
794  */
796  SCIP_LPI* lpi /**< LP interface structure */
797  )
798 { /*lint --e{715}*/
799  errorMessageAbort();
800  return FALSE;
801 }
802 
803 /** returns TRUE iff LP is proven to have a primal unbounded ray (but not necessary a primal feasible point),
804  * and the solver knows and can return the primal ray
805  */
807  SCIP_LPI* lpi /**< LP interface structure */
808  )
809 { /*lint --e{715}*/
810  errorMessageAbort();
811  return FALSE;
812 }
813 
814 /** returns TRUE iff LP is proven to be primal unbounded */
816  SCIP_LPI* lpi /**< LP interface structure */
817  )
818 { /*lint --e{715}*/
819  errorMessageAbort();
820  return FALSE;
821 }
822 
823 /** returns TRUE iff LP is proven to be primal infeasible */
825  SCIP_LPI* lpi /**< LP interface structure */
826  )
827 { /*lint --e{715}*/
828  errorMessageAbort();
829  return FALSE;
830 }
831 
832 /** returns TRUE iff LP is proven to be primal feasible */
834  SCIP_LPI* lpi /**< LP interface structure */
835  )
836 { /*lint --e{715}*/
837  errorMessageAbort();
838  return FALSE;
839 }
840 
841 /** returns TRUE iff LP is proven to have a dual unbounded ray (but not necessary a dual feasible point);
842  * this does not necessarily mean, that the solver knows and can return the dual ray
843  */
845  SCIP_LPI* lpi /**< LP interface structure */
846  )
847 { /*lint --e{715}*/
848  errorMessageAbort();
849  return FALSE;
850 }
851 
852 /** returns TRUE iff LP is proven to have a dual unbounded ray (but not necessary a dual feasible point),
853  * and the solver knows and can return the dual ray
854  */
856  SCIP_LPI* lpi /**< LP interface structure */
857  )
858 { /*lint --e{715}*/
859  errorMessageAbort();
860  return FALSE;
861 }
862 
863 /** returns TRUE iff LP is proven to be dual unbounded */
865  SCIP_LPI* lpi /**< LP interface structure */
866  )
867 { /*lint --e{715}*/
868  errorMessageAbort();
869  return FALSE;
870 }
871 
872 /** returns TRUE iff LP is proven to be dual infeasible */
874  SCIP_LPI* lpi /**< LP interface structure */
875  )
876 { /*lint --e{715}*/
877  errorMessageAbort();
878  return FALSE;
879 }
880 
881 /** returns TRUE iff LP is proven to be dual feasible */
883  SCIP_LPI* lpi /**< LP interface structure */
884  )
885 { /*lint --e{715}*/
886  errorMessageAbort();
887  return FALSE;
888 }
889 
890 /** returns TRUE iff LP was solved to optimality */
892  SCIP_LPI* lpi /**< LP interface structure */
893  )
894 { /*lint --e{715}*/
895  errorMessageAbort();
896  return FALSE;
897 }
898 
899 /** returns TRUE iff current LP basis is stable */
901  SCIP_LPI* lpi /**< LP interface structure */
902  )
903 { /*lint --e{715}*/
904  errorMessageAbort();
905  return FALSE;
906 }
907 
908 /** returns TRUE iff the objective limit was reached */
910  SCIP_LPI* lpi /**< LP interface structure */
911  )
912 { /*lint --e{715}*/
913  errorMessageAbort();
914  return FALSE;
915 }
916 
917 /** returns TRUE iff the iteration limit was reached */
919  SCIP_LPI* lpi /**< LP interface structure */
920  )
921 { /*lint --e{715}*/
922  errorMessageAbort();
923  return FALSE;
924 }
925 
926 /** returns TRUE iff the time limit was reached */
928  SCIP_LPI* lpi /**< LP interface structure */
929  )
930 { /*lint --e{715}*/
931  errorMessageAbort();
932  return FALSE;
933 }
934 
935 /** returns the internal solution status of the solver */
937  SCIP_LPI* lpi /**< LP interface structure */
938  )
939 { /*lint --e{715}*/
940  errorMessageAbort();
941  return FALSE;
942 }
943 
944 /** tries to reset the internal status of the LP solver in order to ignore an instability of the last solving call */
946  SCIP_LPI* lpi, /**< LP interface structure */
947  SCIP_Bool* success /**< pointer to store, whether the instability could be ignored */
948  )
949 { /*lint --e{715}*/
950  assert(success != NULL);
951  errorMessage();
952  return SCIP_PLUGINNOTFOUND;
953 }
954 
955 /** gets objective value of solution */
957  SCIP_LPI* lpi, /**< LP interface structure */
958  SCIP_Real* objval /**< stores the objective value */
959  )
960 { /*lint --e{715}*/
961  assert(objval != NULL);
962  errorMessage();
963  return SCIP_PLUGINNOTFOUND;
964 }
965 
966 /** gets primal and dual solution vectors */
968  SCIP_LPI* lpi, /**< LP interface structure */
969  SCIP_Real* objval, /**< stores the objective value, may be NULL if not needed */
970  SCIP_Real* primsol, /**< primal solution vector, may be NULL if not needed */
971  SCIP_Real* dualsol, /**< dual solution vector, may be NULL if not needed */
972  SCIP_Real* activity, /**< row activity vector, may be NULL if not needed */
973  SCIP_Real* redcost /**< reduced cost vector, may be NULL if not needed */
974  )
975 { /*lint --e{715}*/
976  errorMessage();
977  return SCIP_PLUGINNOTFOUND;
978 }
979 
980 /** gets primal ray for unbounded LPs */
982  SCIP_LPI* lpi, /**< LP interface structure */
983  SCIP_Real* ray /**< primal ray */
984  )
985 { /*lint --e{715}*/
986  errorMessage();
987  return SCIP_PLUGINNOTFOUND;
988 }
989 
990 /** gets dual Farkas proof for infeasibility */
992  SCIP_LPI* lpi, /**< LP interface structure */
993  SCIP_Real* dualfarkas /**< dual Farkas row multipliers */
994  )
995 { /*lint --e{715}*/
996  assert(dualfarkas != NULL);
997  errorMessage();
998  return SCIP_PLUGINNOTFOUND;
999 }
1000 
1001 /** gets the number of LP iterations of the last solve call */
1003  SCIP_LPI* lpi, /**< LP interface structure */
1004  int* iterations /**< pointer to store the number of iterations of the last solve call */
1005  )
1006 { /*lint --e{715}*/
1007  assert(iterations != NULL);
1008  errorMessage();
1009  return SCIP_PLUGINNOTFOUND;
1010 }
1011 
1012 /** gets information about the quality of an LP solution
1013  *
1014  * Such information is usually only available, if also a (maybe not optimal) solution is available.
1015  * The LPI should return SCIP_INVALID for @p quality, if the requested quantity is not available.
1016  */
1018  SCIP_LPI* lpi, /**< LP interface structure */
1019  SCIP_LPSOLQUALITY qualityindicator, /**< indicates which quality should be returned */
1020  SCIP_Real* quality /**< pointer to store quality number */
1021  )
1022 {
1023  assert(lpi != NULL);
1024  assert(quality != NULL);
1025 
1026  *quality = SCIP_INVALID;
1027 
1028  return SCIP_OKAY;
1029 }
1030 
1031 /**@} */
1032 
1033 
1034 
1035 
1036 /*
1037  * LP Basis Methods
1038  */
1039 
1040 /**@name LP Basis Methods */
1041 /**@{ */
1042 
1043 /** gets current basis status for columns and rows; arrays must be large enough to store the basis status */
1045  SCIP_LPI* lpi, /**< LP interface structure */
1046  int* cstat, /**< array to store column basis status, or NULL */
1047  int* rstat /**< array to store row basis status, or NULL */
1048  )
1049 { /*lint --e{715}*/
1050  errorMessage();
1051  return SCIP_PLUGINNOTFOUND;
1052 }
1053 
1054 /** sets current basis status for columns and rows */
1056  SCIP_LPI* lpi, /**< LP interface structure */
1057  int* cstat, /**< array with column basis status */
1058  int* rstat /**< array with row basis status */
1059  )
1060 { /*lint --e{715}*/
1061  assert(cstat != NULL);
1062  assert(rstat != NULL);
1063  errorMessage();
1064  return SCIP_PLUGINNOTFOUND;
1065 }
1066 
1067 /** returns the indices of the basic columns and rows; basic column n gives value n, basic row m gives value -1-m */
1069  SCIP_LPI* lpi, /**< LP interface structure */
1070  int* bind /**< pointer to store basis indices ready to keep number of rows entries */
1071  )
1072 { /*lint --e{715}*/
1073  errorMessage();
1074  return SCIP_PLUGINNOTFOUND;
1075 }
1076 
1077 /** get dense row of inverse basis matrix B^-1
1078  *
1079  * @note The LP interface defines slack variables to have coefficient +1. This means that if, internally, the LP solver
1080  * uses a -1 coefficient, then rows associated with slacks variables whose coefficient is -1, should be negated;
1081  * see also the explanation in lpi.h.
1082  */
1084  SCIP_LPI* lpi, /**< LP interface structure */
1085  int r, /**< row number */
1086  SCIP_Real* coef, /**< pointer to store the coefficients of the row */
1087  int* inds, /**< array to store the non-zero indices, or NULL */
1088  int* ninds /**< pointer to store the number of non-zero indices, or NULL
1089  * (-1: if we do not store sparsity informations) */
1090  )
1091 { /*lint --e{715}*/
1092  errorMessage();
1093  return SCIP_PLUGINNOTFOUND;
1094 }
1095 
1096 /** get dense column of inverse basis matrix B^-1
1097  *
1098  * @note The LP interface defines slack variables to have coefficient +1. This means that if, internally, the LP solver
1099  * uses a -1 coefficient, then rows associated with slacks variables whose coefficient is -1, should be negated;
1100  * see also the explanation in lpi.h.
1101  */
1103  SCIP_LPI* lpi, /**< LP interface structure */
1104  int c, /**< column number of B^-1; this is NOT the number of the column in the LP;
1105  * you have to call SCIPlpiGetBasisInd() to get the array which links the
1106  * B^-1 column numbers to the row and column numbers of the LP!
1107  * c must be between 0 and nrows-1, since the basis has the size
1108  * nrows * nrows */
1109  SCIP_Real* coef, /**< pointer to store the coefficients of the column */
1110  int* inds, /**< array to store the non-zero indices, or NULL */
1111  int* ninds /**< pointer to store the number of non-zero indices, or NULL
1112  * (-1: if we do not store sparsity informations) */
1113  )
1114 { /*lint --e{715}*/
1115  errorMessage();
1116  return SCIP_PLUGINNOTFOUND;
1117 }
1118 
1119 /** get dense row of inverse basis matrix times constraint matrix B^-1 * A
1120  *
1121  * @note The LP interface defines slack variables to have coefficient +1. This means that if, internally, the LP solver
1122  * uses a -1 coefficient, then rows associated with slacks variables whose coefficient is -1, should be negated;
1123  * see also the explanation in lpi.h.
1124  */
1126  SCIP_LPI* lpi, /**< LP interface structure */
1127  int r, /**< row number */
1128  const SCIP_Real* binvrow, /**< row in (A_B)^-1 from prior call to SCIPlpiGetBInvRow(), or NULL */
1129  SCIP_Real* coef, /**< vector to return coefficients */
1130  int* inds, /**< array to store the non-zero indices, or NULL */
1131  int* ninds /**< pointer to store the number of non-zero indices, or NULL
1132  * (-1: if we do not store sparsity informations) */
1133  )
1134 { /*lint --e{715}*/
1135  errorMessage();
1136  return SCIP_PLUGINNOTFOUND;
1137 }
1138 
1139 /** get dense column of inverse basis matrix times constraint matrix B^-1 * A
1140  *
1141  * @note The LP interface defines slack variables to have coefficient +1. This means that if, internally, the LP solver
1142  * uses a -1 coefficient, then rows associated with slacks variables whose coefficient is -1, should be negated;
1143  * see also the explanation in lpi.h.
1144  */
1146  SCIP_LPI* lpi, /**< LP interface structure */
1147  int c, /**< column number */
1148  SCIP_Real* coef, /**< vector to return coefficients */
1149  int* inds, /**< array to store the non-zero indices, or NULL */
1150  int* ninds /**< pointer to store the number of non-zero indices, or NULL
1151  * (-1: if we do not store sparsity informations) */
1152  )
1153 { /*lint --e{715}*/
1154  errorMessage();
1155  return SCIP_PLUGINNOTFOUND;
1156 }
1157 
1158 /**@} */
1159 
1160 
1161 
1162 
1163 /*
1164  * LP State Methods
1165  */
1166 
1167 /**@name LP State Methods */
1168 /**@{ */
1169 
1170 /** stores LPi state (like basis information) into lpistate object */
1172  SCIP_LPI* lpi, /**< LP interface structure */
1173  BMS_BLKMEM* blkmem, /**< block memory */
1174  SCIP_LPISTATE** lpistate /**< pointer to LPi state information (like basis information) */
1175  )
1176 { /*lint --e{715}*/
1177  assert(blkmem != NULL);
1178  assert(lpistate != NULL);
1179  errorMessage();
1180  return SCIP_PLUGINNOTFOUND;
1181 }
1182 
1183 /** loads LPi state (like basis information) into solver; note that the LP might have been extended with additional
1184  * columns and rows since the state was stored with SCIPlpiGetState()
1185  */
1187  SCIP_LPI* lpi, /**< LP interface structure */
1188  BMS_BLKMEM* blkmem, /**< block memory */
1189  SCIP_LPISTATE* lpistate /**< LPi state information (like basis information) */
1190  )
1191 { /*lint --e{715}*/
1192  assert(blkmem != NULL);
1193  errorMessage();
1194  return SCIP_PLUGINNOTFOUND;
1195 }
1196 
1197 /** clears current LPi state (like basis information) of the solver */
1199  SCIP_LPI* lpi /**< LP interface structure */
1200  )
1201 { /*lint --e{715}*/
1202  assert(lpi != NULL);
1203  return SCIP_OKAY;
1204 }
1205 
1206 /** frees LPi state information */
1208  SCIP_LPI* lpi, /**< LP interface structure */
1209  BMS_BLKMEM* blkmem, /**< block memory */
1210  SCIP_LPISTATE** lpistate /**< pointer to LPi state information (like basis information) */
1211  )
1212 { /*lint --e{715}*/
1213  return SCIP_OKAY;
1214 }
1215 
1216 /** checks, whether the given LP state contains simplex basis information */
1218  SCIP_LPI* lpi, /**< LP interface structure */
1219  SCIP_LPISTATE* lpistate /**< LP state information (like basis information) */
1220  )
1221 { /*lint --e{715}*/
1222  errorMessageAbort();
1223  return FALSE;
1224 }
1225 
1226 /** reads LP state (like basis information from a file */
1228  SCIP_LPI* lpi, /**< LP interface structure */
1229  const char* fname /**< file name */
1230  )
1231 { /*lint --e{715}*/
1232  errorMessage();
1233  return SCIP_PLUGINNOTFOUND;
1234 }
1235 
1236 /** writes LP state (like basis information) to a file */
1238  SCIP_LPI* lpi, /**< LP interface structure */
1239  const char* fname /**< file name */
1240  )
1241 { /*lint --e{715}*/
1242  errorMessage();
1243  return SCIP_PLUGINNOTFOUND;
1244 }
1245 
1246 /**@} */
1247 
1248 
1249 
1250 
1251 /*
1252  * LP Pricing Norms Methods
1253  */
1254 
1255 /**@name LP Pricing Norms Methods */
1256 /**@{ */
1257 
1258 /** stores LPi pricing norms information
1259  * @todo should we store norm information?
1260  */
1262  SCIP_LPI* lpi, /**< LP interface structure */
1263  BMS_BLKMEM* blkmem, /**< block memory */
1264  SCIP_LPINORMS** lpinorms /**< pointer to LPi pricing norms information */
1265  )
1266 { /*lint --e{715}*/
1267  errorMessage();
1268  return SCIP_PLUGINNOTFOUND;
1269 }
1270 
1271 /** loads LPi pricing norms into solver; note that the LP might have been extended with additional
1272  * columns and rows since the state was stored with SCIPlpiGetNorms()
1273  */
1275  SCIP_LPI* lpi, /**< LP interface structure */
1276  BMS_BLKMEM* blkmem, /**< block memory */
1277  SCIP_LPINORMS* lpinorms /**< LPi pricing norms information */
1278  )
1279 { /*lint --e{715}*/
1280  errorMessage();
1281  return SCIP_PLUGINNOTFOUND;
1282 }
1283 
1284 /** frees pricing norms information */
1286  SCIP_LPI* lpi, /**< LP interface structure */
1287  BMS_BLKMEM* blkmem, /**< block memory */
1288  SCIP_LPINORMS** lpinorms /**< pointer to LPi pricing norms information */
1289  )
1290 { /*lint --e{715}*/
1291  errorMessage();
1292  return SCIP_PLUGINNOTFOUND;
1293 }
1294 
1295 /**@} */
1296 
1297 
1298 
1299 
1300 /*
1301  * Parameter Methods
1302  */
1303 
1304 /**@name Parameter Methods */
1305 /**@{ */
1306 
1307 /** gets integer parameter of LP */
1309  SCIP_LPI* lpi, /**< LP interface structure */
1310  SCIP_LPPARAM type, /**< parameter number */
1311  int* ival /**< buffer to store the parameter value */
1312  )
1313 { /*lint --e{715}*/
1314  assert(ival != NULL);
1315  return SCIP_PARAMETERUNKNOWN;
1316 }
1317 
1318 /** sets integer parameter of LP */
1320  SCIP_LPI* lpi, /**< LP interface structure */
1321  SCIP_LPPARAM type, /**< parameter number */
1322  int ival /**< parameter value */
1323  )
1324 { /*lint --e{715}*/
1325  return SCIP_PARAMETERUNKNOWN;
1326 }
1327 
1328 /** gets floating point parameter of LP */
1330  SCIP_LPI* lpi, /**< LP interface structure */
1331  SCIP_LPPARAM type, /**< parameter number */
1332  SCIP_Real* dval /**< buffer to store the parameter value */
1333  )
1334 { /*lint --e{715}*/
1335  assert(dval != NULL);
1336  return SCIP_PARAMETERUNKNOWN;
1337 }
1338 
1339 /** sets floating point parameter of LP */
1341  SCIP_LPI* lpi, /**< LP interface structure */
1342  SCIP_LPPARAM type, /**< parameter number */
1343  SCIP_Real dval /**< parameter value */
1344  )
1345 { /*lint --e{715}*/
1346  return SCIP_PARAMETERUNKNOWN;
1347 }
1348 
1349 /**@} */
1350 
1351 /*
1352  * Numerical Methods
1353  */
1354 
1355 /**@name Numerical Methods */
1356 /**@{ */
1357 
1358 /** returns value treated as infinity in the LP solver */
1360  SCIP_LPI* lpi /**< LP interface structure */
1361  )
1362 { /*lint --e{715}*/
1363  return LPIINFINITY;
1364 }
1365 
1366 /** checks if given value is treated as infinity in the LP solver */
1368  SCIP_LPI* lpi, /**< LP interface structure */
1369  SCIP_Real val /**< value to be checked for infinity */
1370  )
1371 { /*lint --e{715}*/
1372  if( val >= LPIINFINITY )
1373  return TRUE;
1374  return FALSE;
1375 }
1376 
1377 /**@} */
1378 
1379 
1380 
1381 
1382 /*
1383  * File Interface Methods
1384  */
1385 
1386 /**@name File Interface Methods */
1387 /**@{ */
1388 
1389 /** reads LP from a file */
1391  SCIP_LPI* lpi, /**< LP interface structure */
1392  const char* fname /**< file name */
1393  )
1394 { /*lint --e{715}*/
1395  errorMessage();
1396  return SCIP_PLUGINNOTFOUND;
1397 }
1398 
1399 /** writes LP to a file */
1401  SCIP_LPI* lpi, /**< LP interface structure */
1402  const char* fname /**< file name */
1403  )
1404 { /*lint --e{715}*/
1405  errorMessage();
1406  return SCIP_PLUGINNOTFOUND;
1407 }
1408 
1409 /**@} */
SCIP_Real SCIPlpiInfinity(SCIP_LPI *lpi)
Definition: lpi_none.c:1359
SCIP_RETCODE SCIPlpiStartStrongbranch(SCIP_LPI *lpi)
Definition: lpi_none.c:644
SCIP_RETCODE SCIPlpiGetBasisInd(SCIP_LPI *lpi, int *bind)
Definition: lpi_none.c:1068
enum SCIP_LPSolQuality SCIP_LPSOLQUALITY
Definition: type_lpi.h:92
SCIP_RETCODE SCIPlpiStrongbranchFrac(SCIP_LPI *lpi, int col, SCIP_Real psol, int itlim, SCIP_Real *down, SCIP_Real *up, SCIP_Bool *downvalid, SCIP_Bool *upvalid, int *iter)
Definition: lpi_none.c:662
SCIP_RETCODE SCIPlpiLoadColLP(SCIP_LPI *lpi, SCIP_OBJSEN objsen, int ncols, const SCIP_Real *obj, const SCIP_Real *lb, const SCIP_Real *ub, char **colnames, int nrows, const SCIP_Real *lhs, const SCIP_Real *rhs, char **rownames, int nnonz, const int *beg, const int *ind, const SCIP_Real *val)
Definition: lpi_none.c:162
SCIP_RETCODE SCIPlpiGetNCols(SCIP_LPI *lpi, int *ncols)
Definition: lpi_none.c:447
SCIP_RETCODE SCIPlpiGetNorms(SCIP_LPI *lpi, BMS_BLKMEM *blkmem, SCIP_LPINORMS **lpinorms)
Definition: lpi_none.c:1261
SCIP_Bool SCIPlpiHasStateBasis(SCIP_LPI *lpi, SCIP_LPISTATE *lpistate)
Definition: lpi_none.c:1217
SCIP_RETCODE SCIPlpiChgObj(SCIP_LPI *lpi, int ncols, int *ind, SCIP_Real *obj)
Definition: lpi_none.c:387
SCIP_RETCODE SCIPlpiReadLP(SCIP_LPI *lpi, const char *fname)
Definition: lpi_none.c:1390
enum SCIP_ObjSen SCIP_OBJSEN
Definition: type_lpi.h:36
#define NULL
Definition: lpi_spx.cpp:130
SCIP_Bool SCIPlpiIsInfinity(SCIP_LPI *lpi, SCIP_Real val)
Definition: lpi_none.c:1367
interface methods for specific LP solvers
SCIP_Bool SCIPlpiIsIterlimExc(SCIP_LPI *lpi)
Definition: lpi_none.c:918
struct SCIP_Messagehdlr SCIP_MESSAGEHDLR
Definition: type_message.h:50
SCIP_RETCODE SCIPlpiFreeState(SCIP_LPI *lpi, BMS_BLKMEM *blkmem, SCIP_LPISTATE **lpistate)
Definition: lpi_none.c:1207
#define FALSE
Definition: def.h:56
SCIP_RETCODE SCIPlpiGetNNonz(SCIP_LPI *lpi, int *nnonz)
Definition: lpi_none.c:462
SCIP_RETCODE SCIPlpiGetColNames(SCIP_LPI *lpi, int firstcol, int lastcol, char **colnames, char *namestorage, int namestoragesize, int *storageleft)
Definition: lpi_none.c:513
SCIP_RETCODE SCIPlpiStrongbranchesFrac(SCIP_LPI *lpi, int *cols, int ncols, SCIP_Real *psols, int itlim, SCIP_Real *down, SCIP_Real *up, SCIP_Bool *downvalid, SCIP_Bool *upvalid, int *iter)
Definition: lpi_none.c:685
#define TRUE
Definition: def.h:55
enum SCIP_Retcode SCIP_RETCODE
Definition: type_retcode.h:53
SCIP_RETCODE SCIPlpiGetBounds(SCIP_LPI *lpi, int firstcol, int lastcol, SCIP_Real *lbs, SCIP_Real *ubs)
Definition: lpi_none.c:565
SCIP_RETCODE SCIPlpiDelColset(SCIP_LPI *lpi, int *dstat)
Definition: lpi_none.c:229
enum SCIP_LPParam SCIP_LPPARAM
Definition: type_lpi.h:61
SCIP_RETCODE SCIPlpiGetBInvRow(SCIP_LPI *lpi, int r, SCIP_Real *coef, int *inds, int *ninds)
Definition: lpi_none.c:1083
SCIP_RETCODE SCIPlpiChgCoef(SCIP_LPI *lpi, int row, int col, SCIP_Real newval)
Definition: lpi_none.c:367
#define SCIPdebugMessage
Definition: pub_message.h:77
SCIP_RETCODE SCIPlpiAddRows(SCIP_LPI *lpi, int nrows, const SCIP_Real *lhs, const SCIP_Real *rhs, char **rownames, int nnonz, const int *beg, const int *ind, const SCIP_Real *val)
Definition: lpi_none.c:260
SCIP_Bool SCIPlpiWasSolved(SCIP_LPI *lpi)
Definition: lpi_none.c:771
SCIP_RETCODE SCIPlpiSolveDual(SCIP_LPI *lpi)
Definition: lpi_none.c:625
SCIP_RETCODE SCIPlpiSolveBarrier(SCIP_LPI *lpi, SCIP_Bool crossover)
Definition: lpi_none.c:634
SCIP_Bool SCIPlpiIsDualUnbounded(SCIP_LPI *lpi)
Definition: lpi_none.c:864
SCIP_RETCODE SCIPlpiDelRowset(SCIP_LPI *lpi, int *dstat)
Definition: lpi_none.c:297
SCIP_Bool SCIPlpiIsDualInfeasible(SCIP_LPI *lpi)
Definition: lpi_none.c:873
SCIP_Bool SCIPlpiIsObjlimExc(SCIP_LPI *lpi)
Definition: lpi_none.c:909
SCIP_RETCODE SCIPlpiReadState(SCIP_LPI *lpi, const char *fname)
Definition: lpi_none.c:1227
SCIP_Bool SCIPlpiExistsDualRay(SCIP_LPI *lpi)
Definition: lpi_none.c:844
SCIP_RETCODE SCIPlpiSetState(SCIP_LPI *lpi, BMS_BLKMEM *blkmem, SCIP_LPISTATE *lpistate)
Definition: lpi_none.c:1186
SCIP_RETCODE SCIPlpiDelRows(SCIP_LPI *lpi, int firstrow, int lastrow)
Definition: lpi_none.c:281
SCIP_RETCODE SCIPlpiSetIntpar(SCIP_LPI *lpi, SCIP_LPPARAM type, int ival)
Definition: lpi_none.c:1319
const char * SCIPlpiGetSolverName(void)
Definition: lpi_none.c:82
SCIP_RETCODE SCIPlpiGetBInvACol(SCIP_LPI *lpi, int c, SCIP_Real *coef, int *inds, int *ninds)
Definition: lpi_none.c:1145
SCIP_RETCODE SCIPlpiSetBase(SCIP_LPI *lpi, int *cstat, int *rstat)
Definition: lpi_none.c:1055
SCIP_Bool SCIPlpiIsPrimalInfeasible(SCIP_LPI *lpi)
Definition: lpi_none.c:824
void * SCIPlpiGetSolverPointer(SCIP_LPI *lpi)
Definition: lpi_none.c:98
#define SCIPerrorMessage
Definition: pub_message.h:45
const char * SCIPlpiGetSolverDesc(void)
Definition: lpi_none.c:90
SCIP_RETCODE SCIPlpiGetCoef(SCIP_LPI *lpi, int row, int col, SCIP_Real *val)
Definition: lpi_none.c:592
SCIP_RETCODE SCIPlpiSolvePrimal(SCIP_LPI *lpi)
Definition: lpi_none.c:616
SCIP_RETCODE SCIPlpiGetIntpar(SCIP_LPI *lpi, SCIP_LPPARAM type, int *ival)
Definition: lpi_none.c:1308
SCIP_RETCODE SCIPlpiGetObjsen(SCIP_LPI *lpi, SCIP_OBJSEN *objsen)
Definition: lpi_none.c:543
SCIP_RETCODE SCIPlpiGetSol(SCIP_LPI *lpi, SCIP_Real *objval, SCIP_Real *primsol, SCIP_Real *dualsol, SCIP_Real *activity, SCIP_Real *redcost)
Definition: lpi_none.c:967
struct SCIP_LPiState SCIP_LPISTATE
Definition: type_lpi.h:95
SCIP_RETCODE SCIPlpiIgnoreInstability(SCIP_LPI *lpi, SCIP_Bool *success)
Definition: lpi_none.c:945
SCIP_RETCODE SCIPlpiGetPrimalRay(SCIP_LPI *lpi, SCIP_Real *ray)
Definition: lpi_none.c:981
SCIP_RETCODE SCIPlpiGetRows(SCIP_LPI *lpi, int firstrow, int lastrow, SCIP_Real *lhs, SCIP_Real *rhs, int *nnonz, int *beg, int *ind, SCIP_Real *val)
Definition: lpi_none.c:496
SCIP_RETCODE SCIPlpiChgBounds(SCIP_LPI *lpi, int ncols, const int *ind, const SCIP_Real *lb, const SCIP_Real *ub)
Definition: lpi_none.c:343
SCIP_RETCODE SCIPlpiGetBase(SCIP_LPI *lpi, int *cstat, int *rstat)
Definition: lpi_none.c:1044
SCIP_RETCODE SCIPlpiChgObjsen(SCIP_LPI *lpi, SCIP_OBJSEN objsen)
Definition: lpi_none.c:378
SCIP_RETCODE SCIPlpiClear(SCIP_LPI *lpi)
Definition: lpi_none.c:328
SCIP_RETCODE SCIPlpiGetObj(SCIP_LPI *lpi, int firstcol, int lastcol, SCIP_Real *vals)
Definition: lpi_none.c:553
SCIP_Bool SCIPlpiIsPrimalFeasible(SCIP_LPI *lpi)
Definition: lpi_none.c:833
SCIP_RETCODE SCIPlpiGetBInvCol(SCIP_LPI *lpi, int c, SCIP_Real *coef, int *inds, int *ninds)
Definition: lpi_none.c:1102
SCIP_RETCODE SCIPlpiScaleRow(SCIP_LPI *lpi, int row, SCIP_Real scaleval)
Definition: lpi_none.c:398
SCIP_RETCODE SCIPlpiDelCols(SCIP_LPI *lpi, int firstcol, int lastcol)
Definition: lpi_none.c:213
#define SCIP_Bool
Definition: def.h:53
SCIP_RETCODE SCIPlpiGetState(SCIP_LPI *lpi, BMS_BLKMEM *blkmem, SCIP_LPISTATE **lpistate)
Definition: lpi_none.c:1171
SCIP_RETCODE SCIPlpiEndStrongbranch(SCIP_LPI *lpi)
Definition: lpi_none.c:653
SCIP_RETCODE SCIPlpiGetCols(SCIP_LPI *lpi, int firstcol, int lastcol, SCIP_Real *lb, SCIP_Real *ub, int *nnonz, int *beg, int *ind, SCIP_Real *val)
Definition: lpi_none.c:476
SCIP_Bool SCIPlpiIsPrimalUnbounded(SCIP_LPI *lpi)
Definition: lpi_none.c:815
SCIP_RETCODE SCIPlpiFreeNorms(SCIP_LPI *lpi, BMS_BLKMEM *blkmem, SCIP_LPINORMS **lpinorms)
Definition: lpi_none.c:1285
#define LPIINFINITY
Definition: lpi_none.c:30
SCIP_RETCODE SCIPlpiWriteLP(SCIP_LPI *lpi, const char *fname)
Definition: lpi_none.c:1400
SCIP_RETCODE SCIPlpiFree(SCIP_LPI **lpi)
Definition: lpi_none.c:137
#define LPINAME
Definition: lpi_none.c:29
SCIP_RETCODE SCIPlpiAddCols(SCIP_LPI *lpi, int ncols, const SCIP_Real *obj, const SCIP_Real *lb, const SCIP_Real *ub, char **colnames, int nnonz, const int *beg, const int *ind, const SCIP_Real *val)
Definition: lpi_none.c:191
SCIP_RETCODE SCIPlpiGetRealpar(SCIP_LPI *lpi, SCIP_LPPARAM type, SCIP_Real *dval)
Definition: lpi_none.c:1329
SCIP_Bool SCIPlpiIsDualFeasible(SCIP_LPI *lpi)
Definition: lpi_none.c:882
SCIP_RETCODE SCIPlpiGetSolFeasibility(SCIP_LPI *lpi, SCIP_Bool *primalfeasible, SCIP_Bool *dualfeasible)
Definition: lpi_none.c:780
SCIP_RETCODE SCIPlpiWriteState(SCIP_LPI *lpi, const char *fname)
Definition: lpi_none.c:1237
SCIP_RETCODE SCIPlpiStrongbranchInt(SCIP_LPI *lpi, int col, SCIP_Real psol, int itlim, SCIP_Real *down, SCIP_Real *up, SCIP_Bool *downvalid, SCIP_Bool *upvalid, int *iter)
Definition: lpi_none.c:711
SCIP_RETCODE SCIPlpiCreate(SCIP_LPI **lpi, SCIP_MESSAGEHDLR *messagehdlr, const char *name, SCIP_OBJSEN objsen)
Definition: lpi_none.c:117
SCIP_RETCODE SCIPlpiGetBInvARow(SCIP_LPI *lpi, int r, const SCIP_Real *binvrow, SCIP_Real *coef, int *inds, int *ninds)
Definition: lpi_none.c:1125
SCIP_RETCODE SCIPlpiGetRealSolQuality(SCIP_LPI *lpi, SCIP_LPSOLQUALITY qualityindicator, SCIP_Real *quality)
Definition: lpi_none.c:1017
SCIP_RETCODE SCIPlpiGetDualfarkas(SCIP_LPI *lpi, SCIP_Real *dualfarkas)
Definition: lpi_none.c:991
public methods for message output
SCIP_RETCODE SCIPlpiGetIterations(SCIP_LPI *lpi, int *iterations)
Definition: lpi_none.c:1002
SCIP_RETCODE SCIPlpiSetNorms(SCIP_LPI *lpi, BMS_BLKMEM *blkmem, SCIP_LPINORMS *lpinorms)
Definition: lpi_none.c:1274
SCIP_RETCODE SCIPlpiScaleCol(SCIP_LPI *lpi, int col, SCIP_Real scaleval)
Definition: lpi_none.c:410
struct SCIP_LPi SCIP_LPI
Definition: type_lpi.h:94
#define SCIP_Real
Definition: def.h:127
#define SCIP_INVALID
Definition: def.h:147
SCIP_RETCODE SCIPlpiStrongbranchesInt(SCIP_LPI *lpi, int *cols, int ncols, SCIP_Real *psols, int itlim, SCIP_Real *down, SCIP_Real *up, SCIP_Bool *downvalid, SCIP_Bool *upvalid, int *iter)
Definition: lpi_none.c:734
SCIP_RETCODE SCIPlpiGetObjval(SCIP_LPI *lpi, SCIP_Real *objval)
Definition: lpi_none.c:956
SCIP_RETCODE SCIPlpiChgSides(SCIP_LPI *lpi, int nrows, const int *ind, const SCIP_Real *lhs, const SCIP_Real *rhs)
Definition: lpi_none.c:355
SCIP_Bool SCIPlpiIsTimelimExc(SCIP_LPI *lpi)
Definition: lpi_none.c:927
SCIP_Bool SCIPlpiHasPrimalRay(SCIP_LPI *lpi)
Definition: lpi_none.c:806
SCIP_RETCODE SCIPlpiGetNRows(SCIP_LPI *lpi, int *nrows)
Definition: lpi_none.c:432
SCIP_RETCODE SCIPlpiGetRowNames(SCIP_LPI *lpi, int firstrow, int lastrow, char **rownames, char *namestorage, int namestoragesize, int *storageleft)
Definition: lpi_none.c:528
SCIP_Bool SCIPlpiHasDualRay(SCIP_LPI *lpi)
Definition: lpi_none.c:855
SCIP_RETCODE SCIPlpiClearState(SCIP_LPI *lpi)
Definition: lpi_none.c:1198
SCIP_Bool SCIPlpiIsOptimal(SCIP_LPI *lpi)
Definition: lpi_none.c:891
SCIP_RETCODE SCIPlpiGetSides(SCIP_LPI *lpi, int firstrow, int lastrow, SCIP_Real *lhss, SCIP_Real *rhss)
Definition: lpi_none.c:578
#define SCIP_ALLOC(x)
Definition: def.h:277
#define SCIPABORT()
Definition: def.h:238
SCIP_RETCODE SCIPlpiSetRealpar(SCIP_LPI *lpi, SCIP_LPPARAM type, SCIP_Real dval)
Definition: lpi_none.c:1340
SCIP_Bool SCIPlpiIsStable(SCIP_LPI *lpi)
Definition: lpi_none.c:900
int SCIPlpiGetInternalStatus(SCIP_LPI *lpi)
Definition: lpi_none.c:936
SCIP_Bool SCIPlpiExistsPrimalRay(SCIP_LPI *lpi)
Definition: lpi_none.c:795