-------- Forwarded Message --------
From: Achim Gädke <[email protected]>
To: [email protected]
Subject: glp_prob_read_lp fails reading compressed (.gz) files
Date: Fri, 2 Aug 2013 09:11:41 +1200
Hi there!
Please compile and run glpk_bug_read_gz.c
$ gcc glpk_bug_read_gz.c -lglpk -o glpk_bug_read_gz
The program is based on glpk-4.52.1/examples/sample.c and contains
various write/read commands.
The write/read pair fails (it is the only one).
fprintf(stdout, "glpk version %s\n", glp_version());
glp_write_lp(lp, NULL, "temp_lp.gz");
glp_read_lp(lp, NULL, "temp_lp.gz");
The terminal output for this program reads:
$ ./glpk_bug_read_gz
glpk version 4.52
Writing problem data to 'temp_lp.gz'...
11 lines were written
Reading problem data from 'temp_lp.gz'...
temp_lp.gz:12: read error -
The bug is reproduced with glpk-4.45 as well.
See also http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=718392
Best regards, Achim
/* sample.c */
#include <stdio.h>
#include <stdlib.h>
#include <glpk.h>
int main(void)
{ glp_prob *lp;
int ia[1+1000], ja[1+1000];
double ar[1+1000], z, x1, x2, x3;
s1: lp = glp_create_prob();
s2: glp_set_prob_name(lp, "sample");
s3: glp_set_obj_dir(lp, GLP_MAX);
s4: glp_add_rows(lp, 3);
s5: glp_set_row_name(lp, 1, "p");
s6: glp_set_row_bnds(lp, 1, GLP_UP, 0.0, 100.0);
s7: glp_set_row_name(lp, 2, "q");
s8: glp_set_row_bnds(lp, 2, GLP_UP, 0.0, 600.0);
s9: glp_set_row_name(lp, 3, "r");
s10: glp_set_row_bnds(lp, 3, GLP_UP, 0.0, 300.0);
s11: glp_add_cols(lp, 3);
s12: glp_set_col_name(lp, 1, "x1");
s13: glp_set_col_bnds(lp, 1, GLP_LO, 0.0, 0.0);
s14: glp_set_obj_coef(lp, 1, 10.0);
s15: glp_set_col_name(lp, 2, "x2");
s16: glp_set_col_bnds(lp, 2, GLP_LO, 0.0, 0.0);
s17: glp_set_obj_coef(lp, 2, 6.0);
s18: glp_set_col_name(lp, 3, "x3");
s19: glp_set_col_bnds(lp, 3, GLP_LO, 0.0, 0.0);
s20: glp_set_obj_coef(lp, 3, 4.0);
s21: ia[1] = 1, ja[1] = 1, ar[1] = 1.0; /* a[1,1] = 1 */
s22: ia[2] = 1, ja[2] = 2, ar[2] = 1.0; /* a[1,2] = 1 */
s23: ia[3] = 1, ja[3] = 3, ar[3] = 1.0; /* a[1,3] = 1 */
s24: ia[4] = 2, ja[4] = 1, ar[4] = 10.0; /* a[2,1] = 10 */
s25: ia[5] = 3, ja[5] = 1, ar[5] = 2.0; /* a[3,1] = 2 */
s26: ia[6] = 2, ja[6] = 2, ar[6] = 4.0; /* a[2,2] = 4 */
s27: ia[7] = 3, ja[7] = 2, ar[7] = 2.0; /* a[3,2] = 2 */
s28: ia[8] = 2, ja[8] = 3, ar[8] = 5.0; /* a[2,3] = 5 */
s29: ia[9] = 3, ja[9] = 3, ar[9] = 6.0; /* a[3,3] = 6 */
s30: glp_load_matrix(lp, 9, ia, ja, ar);
fprintf(stdout, "glpk version %s\n", glp_version());
/*
glp_write_prob(lp, 0, "temp_prob");
glp_read_prob(lp, 0, "temp_prob");
glp_write_prob(lp, 0, "temp_prob.gz");
glp_read_prob(lp, 0, "temp_prob.gz");
glp_write_lp(lp, NULL, "temp_lp");
glp_read_lp(lp, NULL, "temp_lp");
*/
glp_write_lp(lp, NULL, "temp_lp.gz");
glp_read_lp(lp, NULL, "temp_lp.gz");
/*
glp_write_mps(lp, GLP_MPS_FILE, NULL, "temp_mps");
glp_read_mps(lp, GLP_MPS_FILE, NULL, "temp_mps");
glp_write_mps(lp, GLP_MPS_FILE, NULL, "temp_mps.gz");
glp_read_mps(lp, GLP_MPS_FILE, NULL, "temp_mps.gz");
*/
s37: glp_delete_prob(lp);
return 0;
}
/* eof */
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