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Re: [Bug-glpk] [Help-glpk] error's meaning

From: Andrew Makhorin
Subject: Re: [Bug-glpk] [Help-glpk] error's meaning
Date: Thu, 10 Nov 2011 19:43:49 +0300

> I'm trying to solve an MILP program with glpsol and i would like to
> know what the following error means, please.
> integer optimization begins ...
> +  224: mip = not found yet  <=    +inf    (1;0)
> +  441: >>>>>    5.484999986e+00  <=    2.000000039e+08    (18;1)
> Assertion failed:   q!=0
> Error detected in file glpspx02.c   at line 1698
> Abandon

It is a rare bug in the dual simplex solver. Could you please output 
your mip with --wfreemps or --wglp option and post it to me? Thanks.

You may try to bypass this bug by specifying --cbg or --cgr option.

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