[Cbc] Cbc Digest, Vol 87, Issue 13

[Ted Ralphs]

Josh,

Sorry about the out-of-date binaries. What OS are you on? We still do not
have an automated system of updating those binaries and keeping them
manually up-to-date for all projects is a big challenge. I've been doing
monolithic builds of all projects in the "optimization suite" and posting
the binaries here:

http://www.coin-or.org/download/binary/CoinAll/

For Windows, there is also a GUI installer. For OS X, you are better off
installing by Homebrew (recipes are available for some packages) and we
have both Fedora and Debian packages making their way through the pipeline.

I'm planning a reorganization that I hope will make this all a bit more
obvious, but haven't had the time to make it happen yet!

Cheers,

Ted

On Thu, Sep 25, 2014 at 8:56 AM, Joshua Arnott <josh at snorfalorpagus.net>
wrote:

> 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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>


-- 
Dr. Ted Ralphs
Associate Professor, Lehigh University
(610) 628-1280
ted 'at' lehigh 'dot' edu
coral.ie.lehigh.edu/~ted
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