[Help-glpk] Fwd: Re: Infinite cycles

[Heinrich Schuchardt]

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 <address@hidden>
CC:     Help Glpk <address@hidden>



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 <address@hidden
<mailto:address@hidden>> 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
    >
    >
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GLP_buggy_6d21.mod
Description: audio/mod