lemon-0.x: src/lemon/lp_glpk.cc@5cb32ce3236a (annotated)

athos@1261	1	/* -- C++ --
athos@1261	2	* src/lemon/lp_glpk.cc - Part of LEMON, a generic C++ optimization library
athos@1261	3	*
athos@1261	4	* Copyright (C) 2005 Egervary Jeno Kombinatorikus Optimalizalasi Kutatocsoport
athos@1261	5	* (Egervary Combinatorial Optimization Research Group, EGRES).
athos@1261	6	*
athos@1261	7	* Permission to use, modify and distribute this software is granted
athos@1261	8	* provided that this copyright notice appears in all copies. For
athos@1261	9	* precise terms see the accompanying LICENSE file.
athos@1261	10	*
athos@1261	11	* This software is provided "AS IS" with no warranty of any kind,
athos@1261	12	* express or implied, and with no claim as to its suitability for any
athos@1261	13	* purpose.
athos@1261	14	*
athos@1261	15	*/
athos@1261	16
athos@1261	17	#ifndef LEMON_LP_GLPK_CC
athos@1261	18	#define LEMON_LP_GLPK_CC
athos@1261	19
athos@1261	20	///\file
athos@1261	21	///\brief Implementation of the LEMON-GLPK lp solver interface.
athos@1261	22
ladanyi@1305	23	#include <lemon/lp_glpk.h>
athos@1261	24
athos@1261	25	namespace lemon {
athos@1261	26
alpar@1321	27	LpGlpk::LpGlpk() : Parent(),
alpar@1321	28	lp(lpx_create_prob()) {
alpar@1321	29	///\todo constrol function for this:
alpar@1321	30	lpx_set_int_parm(lp, LPX_K_DUAL, 1);
alpar@1321	31	messageLevel(0);
alpar@1321	32	}
alpar@1321	33
alpar@1321	34	LpGlpk::~LpGlpk() {
alpar@1321	35	lpx_delete_prob(lp);
alpar@1321	36	}
alpar@1321	37
alpar@1321	38	int LpGlpk::_addCol() {
alpar@1321	39	int i=lpx_add_cols(lp, 1);
alpar@1321	40	_setColLowerBound(i, -INF);
alpar@1321	41	_setColUpperBound(i, INF);
alpar@1321	42	return i;
alpar@1321	43	}
alpar@1321	44
alpar@1321	45	int LpGlpk::_addRow() {
alpar@1321	46	int i=lpx_add_rows(lp, 1);
alpar@1321	47	return i;
alpar@1321	48	}
alpar@1321	49
alpar@1321	50
alpar@1321	51	void LpGlpk::_setRowCoeffs(int i,
alpar@1321	52	int length,
alpar@1321	53	const int * indices,
alpar@1321	54	const Value * values )
alpar@1321	55	{
alpar@1321	56	lpx_set_mat_row(lp, i, length,
alpar@1321	57	const_cast<int * >(indices) ,
alpar@1321	58	const_cast<Value * >(values));
alpar@1321	59	}
alpar@1321	60
alpar@1321	61	void LpGlpk::_setColCoeffs(int i,
alpar@1321	62	int length,
alpar@1321	63	const int * indices,
alpar@1321	64	const Value * values)
alpar@1321	65	{
alpar@1321	66	lpx_set_mat_col(lp, i, length,
alpar@1321	67	const_cast<int * >(indices),
alpar@1321	68	const_cast<Value * >(values));
alpar@1321	69	}
alpar@1321	70
alpar@1321	71	void LpGlpk::_setColLowerBound(int i, Value lo)
alpar@1321	72	{
alpar@1321	73	if (lo==INF) {
alpar@1321	74	//FIXME error
alpar@1321	75	}
alpar@1321	76	int b=lpx_get_col_type(lp, i);
alpar@1321	77	double up=lpx_get_col_ub(lp, i);
alpar@1321	78	if (lo==-INF) {
alpar@1321	79	switch (b) {
alpar@1321	80	case LPX_FR:
alpar@1321	81	case LPX_LO:
alpar@1321	82	lpx_set_col_bnds(lp, i, LPX_FR, lo, up);
alpar@1321	83	break;
alpar@1321	84	case LPX_UP:
alpar@1321	85	break;
alpar@1321	86	case LPX_DB:
alpar@1321	87	case LPX_FX:
alpar@1321	88	lpx_set_col_bnds(lp, i, LPX_UP, lo, up);
alpar@1321	89	break;
alpar@1321	90	default: ;
alpar@1321	91	//FIXME error
alpar@1321	92	}
alpar@1321	93	} else {
alpar@1321	94	switch (b) {
alpar@1321	95	case LPX_FR:
alpar@1321	96	case LPX_LO:
alpar@1321	97	lpx_set_col_bnds(lp, i, LPX_LO, lo, up);
alpar@1321	98	break;
alpar@1321	99	case LPX_UP:
alpar@1321	100	case LPX_DB:
alpar@1321	101	case LPX_FX:
alpar@1321	102	if (lo==up)
alpar@1321	103	lpx_set_col_bnds(lp, i, LPX_FX, lo, up);
alpar@1321	104	else
alpar@1321	105	lpx_set_col_bnds(lp, i, LPX_DB, lo, up);
alpar@1321	106	break;
alpar@1321	107	default: ;
alpar@1321	108	//FIXME error
alpar@1321	109	}
athos@1261	110	}
athos@1261	111
alpar@1321	112	}
alpar@1321	113
alpar@1321	114	void LpGlpk::_setColUpperBound(int i, Value up)
alpar@1321	115	{
alpar@1321	116	if (up==-INF) {
alpar@1321	117	//FIXME error
athos@1261	118	}
alpar@1321	119	int b=lpx_get_col_type(lp, i);
alpar@1321	120	double lo=lpx_get_col_lb(lp, i);
alpar@1321	121	if (up==INF) {
alpar@1321	122	switch (b) {
alpar@1321	123	case LPX_FR:
alpar@1321	124	case LPX_LO:
alpar@1321	125	break;
alpar@1321	126	case LPX_UP:
alpar@1321	127	lpx_set_col_bnds(lp, i, LPX_FR, lo, up);
alpar@1321	128	break;
alpar@1321	129	case LPX_DB:
alpar@1321	130	case LPX_FX:
alpar@1321	131	lpx_set_col_bnds(lp, i, LPX_LO, lo, up);
alpar@1321	132	break;
alpar@1321	133	default: ;
athos@1261	134	//FIXME error
athos@1261	135	}
alpar@1321	136	} else {
alpar@1321	137	switch (b) {
alpar@1321	138	case LPX_FR:
alpar@1321	139	lpx_set_col_bnds(lp, i, LPX_UP, lo, up);
alpar@1321	140	break;
alpar@1321	141	case LPX_UP:
alpar@1321	142	lpx_set_col_bnds(lp, i, LPX_UP, lo, up);
alpar@1321	143	break;
alpar@1321	144	case LPX_LO:
alpar@1321	145	case LPX_DB:
alpar@1321	146	case LPX_FX:
alpar@1321	147	if (lo==up)
alpar@1321	148	lpx_set_col_bnds(lp, i, LPX_FX, lo, up);
alpar@1321	149	else
alpar@1321	150	lpx_set_col_bnds(lp, i, LPX_DB, lo, up);
alpar@1321	151	break;
alpar@1321	152	default: ;
athos@1261	153	//FIXME error
athos@1261	154	}
alpar@1321	155	}
alpar@1321	156	}
alpar@1321	157
alpar@1321	158	void LpGlpk::_setRowLowerBound(int i, Value lo)
alpar@1321	159	{
alpar@1321	160	if (lo==INF) {
alpar@1321	161	//FIXME error
alpar@1321	162	}
alpar@1321	163	int b=lpx_get_row_type(lp, i);
alpar@1321	164	double up=lpx_get_row_ub(lp, i);
alpar@1321	165	if (lo==-INF) {
alpar@1321	166	switch (b) {
alpar@1321	167	case LPX_FR:
alpar@1321	168	case LPX_LO:
alpar@1321	169	lpx_set_row_bnds(lp, i, LPX_FR, lo, up);
alpar@1321	170	break;
alpar@1321	171	case LPX_UP:
alpar@1321	172	break;
alpar@1321	173	case LPX_DB:
alpar@1321	174	case LPX_FX:
alpar@1321	175	lpx_set_row_bnds(lp, i, LPX_UP, lo, up);
alpar@1321	176	break;
alpar@1321	177	default: ;
alpar@1321	178	//FIXME error
alpar@1321	179	}
alpar@1321	180	} else {
alpar@1321	181	switch (b) {
alpar@1321	182	case LPX_FR:
alpar@1321	183	case LPX_LO:
alpar@1321	184	lpx_set_row_bnds(lp, i, LPX_LO, lo, up);
alpar@1321	185	break;
alpar@1321	186	case LPX_UP:
alpar@1321	187	case LPX_DB:
alpar@1321	188	case LPX_FX:
alpar@1321	189	if (lo==up)
alpar@1321	190	lpx_set_row_bnds(lp, i, LPX_FX, lo, up);
alpar@1321	191	else
alpar@1321	192	lpx_set_row_bnds(lp, i, LPX_DB, lo, up);
alpar@1321	193	break;
alpar@1321	194	default: ;
alpar@1321	195	//FIXME error
athos@1261	196	}
athos@1261	197	}
alpar@1321	198	}
athos@1261	199
athos@1298	200	void LpGlpk::_setRowUpperBound(int i, Value up)
athos@1298	201	{
athos@1298	202	if (up==-INF) {
athos@1298	203	//FIXME error
athos@1298	204	}
athos@1298	205	int b=lpx_get_row_type(lp, i);
athos@1298	206	double lo=lpx_get_row_lb(lp, i);
athos@1298	207	if (up==INF) {
athos@1298	208	switch (b) {
athos@1298	209	case LPX_FR:
athos@1298	210	case LPX_LO:
athos@1298	211	break;
athos@1298	212	case LPX_UP:
athos@1298	213	lpx_set_row_bnds(lp, i, LPX_FR, lo, up);
athos@1298	214	break;
athos@1298	215	case LPX_DB:
athos@1298	216	case LPX_FX:
athos@1298	217	lpx_set_row_bnds(lp, i, LPX_LO, lo, up);
athos@1298	218	break;
athos@1298	219	default: ;
athos@1261	220	//FIXME error
athos@1261	221	}
athos@1298	222	} else {
athos@1298	223	switch (b) {
athos@1298	224	case LPX_FR:
athos@1298	225	lpx_set_row_bnds(lp, i, LPX_UP, lo, up);
athos@1298	226	break;
athos@1298	227	case LPX_UP:
athos@1298	228	lpx_set_row_bnds(lp, i, LPX_UP, lo, up);
athos@1298	229	break;
athos@1298	230	case LPX_LO:
athos@1298	231	case LPX_DB:
athos@1298	232	case LPX_FX:
athos@1298	233	if (lo==up)
athos@1298	234	lpx_set_row_bnds(lp, i, LPX_FX, lo, up);
athos@1298	235	else
athos@1298	236	lpx_set_row_bnds(lp, i, LPX_DB, lo, up);
athos@1298	237	break;
athos@1298	238	default: ;
athos@1298	239	//FIXME error
athos@1261	240	}
athos@1261	241	}
athos@1298	242	}
athos@1261	243
athos@1298	244	void LpGlpk::_setObjCoeff(int i, Value obj_coef)
athos@1298	245	{
athos@1298	246	lpx_set_obj_coef(lp, i, obj_coef);
athos@1298	247	}
athos@1261	248
alpar@1263	249
alpar@1303	250	LpGlpk::SolveExitStatus LpGlpk::_solve()
alpar@1263	251	{
athos@1298	252	int i= lpx_simplex(lp);
athos@1298	253	switch (i) {
athos@1298	254	case LPX_E_OK:
athos@1298	255	return SOLVED;
athos@1298	256	break;
athos@1298	257	default:
athos@1298	258	return UNSOLVED;
athos@1298	259	}
alpar@1263	260	}
alpar@1263	261
alpar@1293	262	LpGlpk::Value LpGlpk::_getPrimal(int i)
alpar@1263	263	{
athos@1298	264	return lpx_get_col_prim(lp,i);
alpar@1263	265	}
alpar@1263	266
alpar@1312	267	LpGlpk::Value LpGlpk::_getPrimalValue()
alpar@1312	268	{
athos@1314	269	return lpx_get_obj_val(lp);
alpar@1312	270	}
alpar@1312	271
athos@1298	272
alpar@1312	273	LpGlpk::SolutionStatus LpGlpk::_getPrimalStatus()
alpar@1294	274	{
athos@1298	275	int stat= lpx_get_status(lp);
athos@1298	276	switch (stat) {
athos@1298	277	case LPX_UNDEF://Undefined (no solve has been run yet)
athos@1298	278	return UNDEFINED;
athos@1298	279	break;
athos@1298	280	case LPX_NOFEAS://There is no feasible solution (primal, I guess)
athos@1298	281	case LPX_INFEAS://Infeasible
athos@1298	282	return INFEASIBLE;
athos@1298	283	break;
athos@1298	284	case LPX_UNBND://Unbounded
athos@1298	285	return INFINITE;
athos@1298	286	break;
athos@1298	287	case LPX_FEAS://Feasible
alpar@1300	288	return FEASIBLE;
athos@1298	289	break;
athos@1298	290	case LPX_OPT://Feasible
athos@1298	291	return OPTIMAL;
athos@1298	292	break;
alpar@1300	293	default:
alpar@1300	294	return UNDEFINED; //to avoid gcc warning
athos@1298	295	//FIXME error
athos@1298	296	}
alpar@1294	297	}
alpar@1263	298
alpar@1263	299
alpar@1312	300	void LpGlpk::_setMax()
alpar@1312	301	{
alpar@1321	302	lpx_set_obj_dir(lp, LPX_MAX);
alpar@1321	303	}
alpar@1321	304
alpar@1312	305	void LpGlpk::_setMin()
alpar@1312	306	{
alpar@1321	307	lpx_set_obj_dir(lp, LPX_MIN);
alpar@1321	308	}
alpar@1321	309
alpar@1321	310
alpar@1321	311	void LpGlpk::messageLevel(int m)
alpar@1321	312	{
alpar@1321	313	lpx_set_int_parm(lp, LPX_K_MSGLEV, m);
alpar@1321	314	}
alpar@1312	315
alpar@1326	316	void LpGlpk::presolver(bool b)
alpar@1326	317	{
alpar@1326	318	lpx_set_int_parm(lp, LPX_K_PRESOL, b);
alpar@1326	319	}
alpar@1326	320
alpar@1312	321
athos@1261	322	} //END OF NAMESPACE LEMON
athos@1261	323
athos@1261	324	#endif //LEMON_LP_GLPK_CC

author	ladanyi
	Thu, 14 Apr 2005 16:37:26 +0000
changeset 1354	5cb32ce3236a
parent 1321	bc3a4c498eb2
child 1359	1581f961cfaa
permissions	-rw-r--r--