[Cbc] Cbc Digest, Vol 87, Issue 13

[Joshua Arnott]

John,

Building and running the latest version of Cbc solves the problem
correctly. That will teach me to assume the binaries on the website are
even remotely up to date!

Josh

On 24 September 2014 12:49, <cbc-request at list.coin-or.org> wrote:

>
> ------------------------------
>
> Message: 4
> Date: Wed, 24 Sep 2014 12:48:58 +0100
> From: John Forrest <john.forrest at fastercoin.com>
> To: cbc at list.coin-or.org
> Subject: Re: [Cbc] CBC reports infeasible, GLPK solves
> Message-ID: <5422AFAA.1040806 at fastercoin.com>
> Content-Type: text/plain; charset="windows-1252"; Format="flowed"
>
> Josh,
>
> Unable to reproduce problem with Cbc 2.8 - all tries worked fine.
>
> Would suggest upgrading as your version is nearly three years old.
>
> John Forrest
> On 24/09/14 12:32, Joshua Arnott wrote:
> > Hello,
> >
> > I've come across a MILP which CBC reports as proven infeasible, but
> > which GLPK solves.
> >
> > I've uploaded the problem in *.lp format here:
> > http://pastebin.com/EEifbfpy
> >
> > The problem was automatically generated based on some data. It's one
> > of many, and is the only one I've come across so far that exhibits
> > this problem. I guess it's something to do with tolerances or
> > precision in CBC. Is there anything I can do to get CBC to solve it?
> >
> > See below the outputs fro CBC and GLPK (via GLPSOL).
> >
> > Kind regards,
> >
> > Josh
>
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