[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: [Bug-glpk] Some unsuccessful runs (Windows, 4.55, 4.56, 4.59, 4.59.2
From: |
Andrew Makhorin |
Subject: |
Re: [Bug-glpk] Some unsuccessful runs (Windows, 4.55, 4.56, 4.59, 4.59.2) |
Date: |
Sun, 27 Mar 2016 19:29:17 +0300 |
Anton,
> There are ten inputs originally collected for GLPK 4.55.
> Three of them do not confuse GLPK since 4.56, at least for one
> hour horizon. Another two invariably force the solver to fail.
>
> >From 4.55, 4.56 to 4.59, 4.59.2, the set of errors has changed.
> Now it includes, besides locking in dual simplex,
> Assertion failed: tcol[csa->p] != 0.0
> Error detected in file ..\src\simplex\spydual.c at line ...
> and
> glp_intopt: cannot solve current LP relaxation.
>
Thank you very much for your evaluation of glpk. Your models have some
unusual numerical properties that helps me to reveal some rare cases in
the simplex algorithms.
I added another feature to the glpk dual simplex solver, which is the
perturbation of objective coefficients used to avoid numerical
instability and cycling.
I will inform you about a new release of glpk.
Best regards,
Andrew Makhorin
[Prev in Thread] |
Current Thread |
[Next in Thread] |
- Re: [Bug-glpk] Some unsuccessful runs (Windows, 4.55, 4.56, 4.59, 4.59.2),
Andrew Makhorin <=