> thank you very much for having a look at my problem. > Attached you can find two problem files and two result files.
Thank you. > > glpk_mip_problem.glpk is my original problem and glpk_mip_result.txt > is the solution found by glpk of which I think it is suboptimal. > > the problem file with _cplex in its name has additional constraints that fix > all variables to the cplex solution. The result you can find in file number > 4. > > I am using glpk version 4.52. > Some double-bounded variables in your instances have very large upper bound (1e+20) that may cause numerical difficulties. I guess that your intention was simply to indicate that such variables have no upper bound. The correct way to do this is to specify the column type GLP_LO (rather than GLP_DB) in corresponding calls to glp_set_col_bnds. For more details please see the glpk reference manual included in the distribution. _______________________________________________ Help-glpk mailing list [email protected] https://lists.gnu.org/mailman/listinfo/help-glpk
