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Re: [Bug-glpk] [Fwd: preprocessing goes into infinite loop]


From: Andrew Makhorin
Subject: Re: [Bug-glpk] [Fwd: preprocessing goes into infinite loop]
Date: Tue, 17 Jan 2012 20:19:53 +0300

> I suggest that the problem due to missing bounds should be gracefully
> detected and a meaningful message should be displayed to the user.

In principle, a warning message would be useful. However, glpk is able
to correctly process unbounded integer variables. The bug appear due to
insufficient robustness of the mip preprocessor--there should be a check
that an lower/upper bound of an integer variable increases/decreases too
much.




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