Hi, On Thu, 22 Apr 2010, Andrew Makhorin <m...@gnu.org> writes: > Most likely your instance has multiple optima, so your program finds > one optimal solution while glpsol finds another. As you can see the > optimal objective value is the same in both cases. > > Note that to solve mip you need to call glp_simplex (to find optimal > solution to lp relaxation) and *then* call glp_intopt (to find integer > optimal solution), in which case the column values should be obtained > with glp_mip_col_val, not with glp_get_col_prim. It happened that for > your particular instance optimal solution to lp relaxation is integer > feasible and therefore integer optimal; however, in a general case > glp_intopt should be used. For details please see the glpk reference > manual.
I incorporated glp_mip_col_val() and glp_intopt() into the code, and it works like a charm. OTOH, please excuse my ignorance, but assuming all my variables are marked as binary in CPLEX LP file, do I really need to call glp_intopt() after glp_simplex() even if glp_get_status(lp) == GLP_OPT assertion holds? Regards. _______________________________________________ Help-glpk mailing list Help-glpk@gnu.org http://lists.gnu.org/mailman/listinfo/help-glpk
