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Re: [Help-glpk] MIP Solvers (i.e CBC, CPLEX, GLPK, GUROBI, LPSOLVE, SCIP

From: Andrew Makhorin
Subject: Re: [Help-glpk] MIP Solvers (i.e CBC, CPLEX, GLPK, GUROBI, LPSOLVE, SCIPC, SCIPL, SCIPS and XPRESS) Benchmark
Date: Mon, 19 Nov 2012 10:49:33 +0400

> It seems that the generated FreeMPS and MPS could not be solved as
> well in GLPK/Mathrog CLI (i.e. glpsol).
> However, nothing wrong with GLPK/MathProg generated FreeMPS and MPS
> MIP models. I check the other MIP models in example (e.g. bpp.mod)
> glpsol --math bpp.mod --wfreemps bpp_fmps.mps
> And this
> glpsol --freemps  bpp_fmps.mps
> Got the expected results.
> However, this problem (below). The objective function = 0

Looks like your instance is maximization while mps always assumes
minimization. You need either to change the objective sign in the
mathprog model or specify --max option for glpsol.

FYI: You can try to post your instance to the neos server; see .

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