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[Help-glpk] glp_intopt and MIP presolve

From: François Galea
Subject: [Help-glpk] glp_intopt and MIP presolve
Date: Thu, 27 Sep 2007 12:54:04 +0200
User-agent: IceDove (X11/20070329)


As far as I know, there are two different callable functions in GLPK, for MIP solving.

The former is lpx_intopt, which may be seen as a "black box" function, allowing to solve a whole problem, from the root LP to the integer optimal solution. It also features a MIP presolve functionality (ipp_presolve).

The latter is glp_intopt, which allows the user to set a callback routine which is supposed to help the branch-and-bound resolution of the problem.

My question is: is there a "legal" and portable way to call GLPK's MIP presolve when using glp_intopt ?

Could it be possible to let the user program call the presolve whenever needed ? (For instance, to be able check the differences between the original LP and the presolved LP).

Thank you,


François Galea

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