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Re: [Help-glpk] lp/mip preprocessor api

From: Andrew Makhorin
Subject: Re: [Help-glpk] lp/mip preprocessor api
Date: Sat, 02 Dec 2017 21:41:04 +0300

> This is true, however after step L4 in your suggested API:
> Q = glp_npp_build_prob(npp, ...);
> any subsequent modifications to Q are not reflected in the PP
> workspace. My suggestion is to allow calling glp_npp_load_prob() with
> this modified Q (with changed bounds or added rows) to update the
> workspace before further preprocessing passes. 

There is no need (and technically it'd be difficult) to load Q back into
the PP wksp. It would be sufficient to provide some specific
preprocessor routines that allows, for example, fixing a column or add a
row to the current instance residing in the workspace.

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