[Dip] Dippy says problem is infeasible

[Ted Ralphs]

Hi Romain,

What's the version of DipPy you are using? How are you reading the problem
into DipPy? Are you able to share the Python script you're using?

Cheers,

Ted



On Thu, Feb 16, 2017 at 2:04 PM, Romain Montagné <romain.montagne at polymtl.ca
> wrote:

> Hello Ted,
>
> I am using DIP as a generic solver. I have simply created a
> dippy.DipProblem that I solve with and without the doPriceCut option, like
> in the examples that are provided.
>
> I have attached 4 files:
>
> - LP.lp is the .lp file
> - LP_blocks.txt is the block file
> - DoPriceCut0_terminal_output.txt is what I see on my screen when I solve
> the problem without the doPriceCut option (and it works fine)
> - DoPriceCut1_terminal_output.txt is what I see on my screen when I solve
> it with the doPriceCut option (and it tells me problem infeasible)
>
> The version of DIP that I am using is 1.4.8. I work on a linux 64 bit
> machine, and my compiler is gcc, version 4.4.7.
>
> If you need other information please let me know.
>
> Thank you very much for your help,
>
> Romain
>
>
>
>
>
>
>
>
> Le 16 févr. 2017 à 11:38, Ted Ralphs <ted at lehigh.edu> a écrit :
>
> Hi Romain,
>
> Are you using DIP as a generic solver or have you built an application?
> Can you send the .lp file and the block file, as well as other information,
> such as version number, platform, compiler, etc.? I would like to try and
> replicate this.
>
> Cheers,
>
> Ted
>
> On Thu, Feb 9, 2017 at 6:36 PM, Romain Montagné <
> romain.montagne at polymtl.ca> wrote:
>
>> PS: After saying the problem is infeasible, I get the following error:  "Segmentation
>> fault (core dumped)"
>>
>>
>> Le 9 févr. 2017 à 17:45, Romain Montagné <romain.montagne at polymtl.ca> a
>> écrit :
>>
>> Hello DIP community,
>>
>> I am using Dippy to solve a MILP. I want to compare  branch-and-bound and
>> branch-and-price performances.
>>
>> When I solve the problem with branch-and-bound (i.e., with the option
>> ‘doPriceCut’ set to 0), it works great. But when I activate the
>> ‘doPriceCut’ option for branch-and-price, it tells me the problem is
>> infeasible.
>>
>> Does anyone know what is happening?
>>
>> I have looked at the .lp file as well as the block file and they look ok.
>>
>> Any help is greatly appreciated.
>>
>> Cheers,
>>
>> Romain Montagné, PhD
>>
>>
>>
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>
>
>
> --
> Dr. Ted Ralphs
> Visiting Researcher, Zuse Institute Berlin
> Professor, Lehigh University
> (610) 628-1280
> ted 'at' lehigh 'dot' edu
> coral.ie.lehigh.edu/~ted
>
>
>
>


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