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/* wrprob.c (write problem data in GLPK format) */
/***********************************************************************
* This code is part of GLPK (GNU Linear Programming Kit).
*
* Copyright (C) 2010-2016 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 "prob.h"
#define xfprintf glp_format
/***********************************************************************
* NAME
*
* glp_write_prob - write problem data in GLPK format
*
* SYNOPSIS
*
* int glp_write_prob(glp_prob *P, int flags, const char *fname);
*
* The routine glp_write_prob writes problem data in GLPK LP/MIP format
* to a text file.
*
* RETURNS
*
* If the operation was successful, the routine returns zero. Otherwise
* it prints an error message and returns non-zero. */
int glp_write_prob(glp_prob *P, int flags, const char *fname)
{ glp_file *fp;
GLPROW *row;
GLPCOL *col;
GLPAIJ *aij;
int mip, i, j, count, ret;
#if 0 /* 04/IV-2016 */
if (P == NULL || P->magic != GLP_PROB_MAGIC)
xerror("glp_write_prob: P = %p; invalid problem object\n",
P);
#endif
if (flags != 0)
xerror("glp_write_prob: flags = %d; invalid parameter\n",
flags);
if (fname == NULL)
xerror("glp_write_prob: fname = %d; invalid parameter\n",
fname);
xprintf("Writing problem data to '%s'...\n", fname);
fp = glp_open(fname, "w"), count = 0;
if (fp == NULL)
{ xprintf("Unable to create '%s' - %s\n", fname, get_err_msg());
ret = 1;
goto done;
}
/* write problem line */
mip = (glp_get_num_int(P) > 0);
xfprintf(fp, "p %s %s %d %d %d\n", !mip ? "lp" : "mip",
P->dir == GLP_MIN ? "min" : P->dir == GLP_MAX ? "max" : "???",
P->m, P->n, P->nnz), count++;
if (P->name != NULL)
xfprintf(fp, "n p %s\n", P->name), count++;
if (P->obj != NULL)
xfprintf(fp, "n z %s\n", P->obj), count++;
/* write row descriptors */
for (i = 1; i <= P->m; i++)
{ row = P->row[i];
if (row->type == GLP_FX && row->lb == 0.0)
goto skip1;
xfprintf(fp, "i %d ", i), count++;
if (row->type == GLP_FR)
xfprintf(fp, "f\n");
else if (row->type == GLP_LO)
xfprintf(fp, "l %.*g\n", DBL_DIG, row->lb);
else if (row->type == GLP_UP)
xfprintf(fp, "u %.*g\n", DBL_DIG, row->ub);
else if (row->type == GLP_DB)
xfprintf(fp, "d %.*g %.*g\n", DBL_DIG, row->lb, DBL_DIG,
row->ub);
else if (row->type == GLP_FX)
xfprintf(fp, "s %.*g\n", DBL_DIG, row->lb);
else
xassert(row != row);
skip1: if (row->name != NULL)
xfprintf(fp, "n i %d %s\n", i, row->name), count++;
}
/* write column descriptors */
for (j = 1; j <= P->n; j++)
{ col = P->col[j];
if (!mip && col->type == GLP_LO && col->lb == 0.0)
goto skip2;
if (mip && col->kind == GLP_IV && col->type == GLP_DB &&
col->lb == 0.0 && col->ub == 1.0)
goto skip2;
xfprintf(fp, "j %d ", j), count++;
if (mip)
{ if (col->kind == GLP_CV)
xfprintf(fp, "c ");
else if (col->kind == GLP_IV)
xfprintf(fp, "i ");
else
xassert(col != col);
}
if (col->type == GLP_FR)
xfprintf(fp, "f\n");
else if (col->type == GLP_LO)
xfprintf(fp, "l %.*g\n", DBL_DIG, col->lb);
else if (col->type == GLP_UP)
xfprintf(fp, "u %.*g\n", DBL_DIG, col->ub);
else if (col->type == GLP_DB)
xfprintf(fp, "d %.*g %.*g\n", DBL_DIG, col->lb, DBL_DIG,
col->ub);
else if (col->type == GLP_FX)
xfprintf(fp, "s %.*g\n", DBL_DIG, col->lb);
else
xassert(col != col);
skip2: if (col->name != NULL)
xfprintf(fp, "n j %d %s\n", j, col->name), count++;
}
/* write objective coefficient descriptors */
if (P->c0 != 0.0)
xfprintf(fp, "a 0 0 %.*g\n", DBL_DIG, P->c0), count++;
for (j = 1; j <= P->n; j++)
{ col = P->col[j];
if (col->coef != 0.0)
xfprintf(fp, "a 0 %d %.*g\n", j, DBL_DIG, col->coef),
count++;
}
/* write constraint coefficient descriptors */
for (i = 1; i <= P->m; i++)
{ row = P->row[i];
for (aij = row->ptr; aij != NULL; aij = aij->r_next)
xfprintf(fp, "a %d %d %.*g\n", i, aij->col->j, DBL_DIG,
aij->val), count++;
}
/* write end line */
xfprintf(fp, "e o f\n"), count++;
#if 0 /* FIXME */
xfflush(fp);
#endif
if (glp_ioerr(fp))
{ xprintf("Write error on '%s' - %s\n", fname, get_err_msg());
ret = 1;
goto done;
}
xprintf("%d lines were written\n", count);
ret = 0;
done: if (fp != NULL) glp_close(fp);
return ret;
}
/* eof */
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