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Re: [Bug-glpk] Bug in handling RANGES section in mps file
From: |
Andrew Makhorin |
Subject: |
Re: [Bug-glpk] Bug in handling RANGES section in mps file |
Date: |
Fri, 26 May 2017 06:53:43 +0300 |
Chris,
> glpk is saying that cont1 found in
> http://plato.asu.edu/ftp/lptestset/misc/ has no primal feasible
> solution, while other solvers can solve it. I managed to trace it to
> an error in the handling of the RANGES statement in mps files, fixed
> by the attached patch.
Fixed. Thank you very much for your bug report and patch.
>
> After this fix the solver starts but fails due to singular basis
> matrix, but this is another issue.
>
This happens due to the initial basis routine which constructs a bad
initial basis.
Best regards,
Andrew Makhorin
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