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Re: [Bug-glpk] Problem with Glpk 4.9

From: Andrew Makhorin
Subject: Re: [Bug-glpk] Problem with Glpk 4.9
Date: Mon, 21 Jul 2008 20:43:40 +0400

> Good evening, I sometimes find negative solutions of the simplex method
> from glpkmex though I impose the parameter "lb" to 0. This happens
> sometimes when I must resolute large or very large programmation
> problems. What's the problem? The software is not totally reliable for
> large problems?

Thank you for your report.

Does the solver report infeasibility or optimality? If the latter,
how large is the bound violation? Note that in a solution, which is
marked as feasible or /optimal, some basic variables may slightly
(i.e. within a tolerance) violate their bounds.

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