Andrew, --nopresol option affects only lp, not mip.
Actually, if --nointopt is specified, then the glp_simplex() call in glpsol.c will use the lp presolver parameters, so --nopresol is also needed to completely disable presolving. > > Also "glpsol --lp --nointopt problem.lp" works which points to the MIP > > presolver as the "faulty" part. > > Yes, glpsol fails on your instance because of the mip preprocessor. In this case, the mip preprocessor does not look like it is doing a lot more than the lp one. The difference is due to the additional power of 2 scaling done in this case (together with the preprocessing changes of course). Hopefully, this observation will help you isolate the issue. Best Regards, Chris Matrakidis
_______________________________________________ Bug-glpk mailing list [email protected] https://lists.gnu.org/mailman/listinfo/bug-glpk
