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Re: [Help-glpk] [Fwd: MathProg to Cplex problem]

From: Andrew Makhorin
Subject: Re: [Help-glpk] [Fwd: MathProg to Cplex problem]
Date: Tue, 08 Apr 2014 17:40:29 +0400

> I'm a new user of both Cplex and Glpsol, and i'm currently facing a
> strange problem which you guys might know how to go through. I want to
> convert a MathProg file into cplex formulation so that i can solve it
> faster.
> I use the simple command : glpsol -m model.mod -d data.dat --check
> --wcpxlp model.lp   which works fine.
> The problem is that in model.lp, my binary variables from model.mod are
> not defined as binary variables but with bounds such that :  0 <= x(1,1)
> <= 1 and as Generals x(1,1).

A general integer variable with lower bound 0 and upper bound 1 is a
binary variable, so there should be no problem.

> My question is : Is there a way to automatically convert integer variables
> from model.mod into BINARY variables in model.lp ? Indeed, i could remove
> the bounds and define the variables as BINARY and not Generals but i would
> have a lot of manipulations to do as i've got lots of benchs

No conversion is needed.

> More over, i get the feeling that this would make my PLNE easier to solve.

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