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Re: [Help-glpk] [Fwd: mip behavior]

From: Michael Hennebry
Subject: Re: [Help-glpk] [Fwd: mip behavior]
Date: Fri, 15 Apr 2011 10:27:56 -0500 (CDT)
User-agent: Alpine 1.00 (DEB 882 2007-12-20)

On Fri, 15 Apr 2011, Andrew Makhorin wrote:

Currently the objective granularity check is disabled because of the new
mip preprocessor, which is still incomplete. Sorry.

If you know that your objective is integer, you may specify an
appropriate mip gap as Marcelo suggested (say, 0.06 for your example) to
stop the search once the optimum has been found.

A problem with mip gap is that it is fractional.
What does he use if the minimum objective might be -1 or +600?

Using a callback would seem a better option.

Michael   address@hidden
"Pessimist: The glass is half empty.
Optimist:   The glass is half full.
Engineer:   The glass is twice as big as it needs to be."

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