[Cbc] Infeasible in CBC, optimal for commercial solvers

[Haroldo Santos]

Hi Kevin,

Tried CBC without pre-processing

cbc model3.mps  preprocess off solve

and the optimal solution is generated. It seems that this is a
pre-processing bug.

[]'s

On Mon, Nov 20, 2017 at 9:52 AM, Kevin van Blokland <
kevin.vanblokland at cqm.nl> wrote:

> Dear CBC community,
>
> We are faced with a problem formulation that is infeasible for CBC but
> optimal for commercial solvers. My best guess is that the problem is
> related to integer/floating point precision issues.
>
> Is someone able to look at the provided mps files and give us any
> direction on a solution? The mps file can be downloaded from the following
> link: https://cqmshare.blob.core.windows.net/uploads/model3.
> mps?st=2017-11-20T11%3A25%3A00Z&se=2018-11-21T11%3A25%
> 3A00Z&sp=r&sv=2016-05-31&sr=b&sig=ecTeCY%2BaqgbGr%
> 2By7CHxw6p6jCWtIR9k2U02b3KT7CTg%3D
> <https://urldefense.proofpoint.com/v2/url?u=https-3A__cqmshare.blob.core.windows.net_uploads_model3.mps-3Fst-3D2017-2D11-2D20T11-253A25-253A00Z-26se-3D2018-2D11-2D21T11-253A25-253A00Z-26sp-3Dr-26sv-3D2016-2D05-2D31-26sr-3Db-26sig-3DecTeCY-252BaqgbGr-252By7CHxw6p6jCWtIR9k2U02b3KT7CTg-253D&d=DwMBAg&c=Ngd-ta5yRYsqeUsEDgxhcqsYYY1Xs5ogLxWPA_2Wlc4&r=pLOfVNEEHf-xhIqn1-uzYcZ6Q7UefG6Bg6rXCKTMiAA&m=rsB_EgOtUOY0p867fwcCxJ7fnELGGS7yCqMCLfw8eq0&s=eiTRmkXMeLQUydTAKNVV2hDrVgCI5vJvyb0okFn5BLg&e=>
>
> Help is very much appreciated!
>
> Kind regards,
>
> Kevin van Blokland
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>


-- 
=============================================================
Haroldo Gambini Santos
Computing Department
Universidade Federal de Ouro Preto - UFOP
email: haroldo [at ] iceb.ufop.br
home/research page: www.decom.ufop.br/haroldo


It has long been an axiom of mine that the little things are infinitely
the most important.
-- Sir Arthur Conan Doyle, "A Case of Identity"
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