Fwd: Re: Infinite cycles

Hello Andrew,

the interesting thing about Matheu's example is that the infeasability
is constantly increasing over multiple orders of magnitude.

Somewhere the restart is missing.

Best regards

Heinrich Schuchardt

-------- Forwarded Message --------
Subject: 	Re: [Help-glpk] Infinite cycles
Date: 	Mon, 16 Jan 2017 18:02:00 +0100
To: 	Heinrich Schuchardt <[email protected]>
CC: 	Help Glpk <[email protected]>



Dear Heinrich,

in attachment you can find a problem that runs into
infinite loops for
glpsol -m GLP_buggy_6d21.mod --norelax

and GLPSOL being version 4.61

  Mathieu

On 11 January 2017 at 19:52, Heinrich Schuchardt <[email protected]
<mailto:[email protected]>> wrote:

    glpsol -m GLP_buggy.mod  --norelax
    runs fine.

    glpsol -m GLP_buggy.mod
    loops for ever.

    I tested with the GLPK 4.61 prerelease.

    Best regards

    Heinrich Schuchardt

    On 01/11/2017 12:14 PM, Mathieu Dutour wrote:
    > Dear all,
    >
    > I obtained some infinite cycles when running the
    > glpsol standalone solver on some instances.
    > See two files in attachment.
    >
    > I had the instances of this phenomenon with
    > version 4.57 which disappeared with version 4.60.
    >
    > Is there a way to avoid this phenomenon? I mean
    > it is fully acceptable to me to have GLPK report
    > that he cannot solve an instance due to numerical
    > instability. What is not acceptable is the infinite
    > cycles.
    >
    > Thanks in advance for any help.
    > Sincerely,
    >
    >   Mathieu
    >
    >
    > _______________________________________________
    > Help-glpk mailing list
    > [email protected] <mailto:[email protected]>
    > https://lists.gnu.org/mailman/listinfo/help-glpk
    <https://lists.gnu.org/mailman/listinfo/help-glpk>
    >

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