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Re: [Help-glpk] glpk 4.9 release information

From: Oscar Gustafsson
Subject: Re: [Help-glpk] glpk 4.9 release information
Date: Thu, 26 Jan 2006 10:20:13 +0100 (MET)

Thank you for your answer,

On Thu, 19 Jan 2006, Andrew Makhorin wrote:
This feature will be implemented in a next release.
Sounds great!

The lower bound obtained from a relaxation is only a bound. Its value
may depend, for example, on transformations performed by presolver or
on cutting planes added to the relaxation. So it does not express any
essential information.
I agree with you, but when using cplex I use it as an indication of the progress of the solver. If the lower bound only changes in, say, the 12th digit it is quite likely that the solver will run out of memory before the optimal solution is found. So if it would be possible to optionally print it I would most likely use it for this kind of thing.

You can use the C preprocessor (gcc -E) to prepare data files.
At the moment I do like cat *.dat > merged.dat, but often I forget to update the merged file when changing one data file.


Oscar Gustafsson

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