Cedric,
I am unable to reproduce the bug.
To help me to catch the bug, could you please insert the following
statements immediately before the call to glp_del_cols causing the bug:
printf("m = %d\n", glp_get_num_rows(lp));
printf("n = %d\n", glp_get_num_cols(lp));
printf("valid = %d\n", glp_bf_exists(lp));
printf("ret = %d\n", glp_factorize(lp));
and post me the log.
Thank you,
Andrew Makhorin
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