diff options
Diffstat (limited to 'test/monniaux/glpk-4.65/src/api/asnlp.c')
| -rw-r--r-- | test/monniaux/glpk-4.65/src/api/asnlp.c | 104 |
1 files changed, 104 insertions, 0 deletions
diff --git a/test/monniaux/glpk-4.65/src/api/asnlp.c b/test/monniaux/glpk-4.65/src/api/asnlp.c new file mode 100644 index 00000000..cfa925d0 --- /dev/null +++ b/test/monniaux/glpk-4.65/src/api/asnlp.c @@ -0,0 +1,104 @@ +/* asnlp.c (convert assignment problem to LP) */ + +/*********************************************************************** +* This code is part of GLPK (GNU Linear Programming Kit). +* +* Copyright (C) 2009-2016 Andrew Makhorin, Department for Applied +* Informatics, Moscow Aviation Institute, Moscow, Russia. All rights +* reserved. E-mail: <mao@gnu.org>. +* +* GLPK is free software: you can redistribute it and/or modify it +* under the terms of the GNU General Public License as published by +* the Free Software Foundation, either version 3 of the License, or +* (at your option) any later version. +* +* GLPK is distributed in the hope that it will be useful, but WITHOUT +* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY +* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public +* License for more details. +* +* You should have received a copy of the GNU General Public License +* along with GLPK. If not, see <http://www.gnu.org/licenses/>. +***********************************************************************/ + +#include "env.h" +#include "glpk.h" + +/*********************************************************************** +* NAME +* +* glp_asnprob_lp - convert assignment problem to LP +* +* SYNOPSIS +* +* int glp_asnprob_lp(glp_prob *P, int form, glp_graph *G, int names, +* int v_set, int a_cost); +* +* DESCRIPTION +* +* The routine glp_asnprob_lp builds an LP problem, which corresponds +* to the assignment problem on the specified graph G. +* +* RETURNS +* +* If the LP problem has been successfully built, the routine returns +* zero, otherwise, non-zero. */ + +int glp_asnprob_lp(glp_prob *P, int form, glp_graph *G, int names, + int v_set, int a_cost) +{ glp_vertex *v; + glp_arc *a; + int i, j, ret, ind[1+2]; + double cost, val[1+2]; + if (!(form == GLP_ASN_MIN || form == GLP_ASN_MAX || + form == GLP_ASN_MMP)) + xerror("glp_asnprob_lp: form = %d; invalid parameter\n", + form); + if (!(names == GLP_ON || names == GLP_OFF)) + xerror("glp_asnprob_lp: names = %d; invalid parameter\n", + names); + if (v_set >= 0 && v_set > G->v_size - (int)sizeof(int)) + xerror("glp_asnprob_lp: v_set = %d; invalid offset\n", + v_set); + if (a_cost >= 0 && a_cost > G->a_size - (int)sizeof(double)) + xerror("glp_asnprob_lp: a_cost = %d; invalid offset\n", + a_cost); + ret = glp_check_asnprob(G, v_set); + if (ret != 0) goto done; + glp_erase_prob(P); + if (names) glp_set_prob_name(P, G->name); + glp_set_obj_dir(P, form == GLP_ASN_MIN ? GLP_MIN : GLP_MAX); + if (G->nv > 0) glp_add_rows(P, G->nv); + for (i = 1; i <= G->nv; i++) + { v = G->v[i]; + if (names) glp_set_row_name(P, i, v->name); + glp_set_row_bnds(P, i, form == GLP_ASN_MMP ? GLP_UP : GLP_FX, + 1.0, 1.0); + } + if (G->na > 0) glp_add_cols(P, G->na); + for (i = 1, j = 0; i <= G->nv; i++) + { v = G->v[i]; + for (a = v->out; a != NULL; a = a->t_next) + { j++; + if (names) + { char name[50+1]; + sprintf(name, "x[%d,%d]", a->tail->i, a->head->i); + xassert(strlen(name) < sizeof(name)); + glp_set_col_name(P, j, name); + } + ind[1] = a->tail->i, val[1] = +1.0; + ind[2] = a->head->i, val[2] = +1.0; + glp_set_mat_col(P, j, 2, ind, val); + glp_set_col_bnds(P, j, GLP_DB, 0.0, 1.0); + if (a_cost >= 0) + memcpy(&cost, (char *)a->data + a_cost, sizeof(double)); + else + cost = 1.0; + glp_set_obj_coef(P, j, cost); + } + } + xassert(j == G->na); +done: return ret; +} + +/* eof */ |