[Dip] Dippy says problem is infeasible

[Romain Montagné]

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 <mailto: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 <mailto: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 <mailto: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 
> 
> 
> _______________________________________________
> Dip mailing list
> Dip at list.coin-or.org <mailto:Dip at list.coin-or.org>
> https://urldefense.proofpoint.com/v2/url?u=http-3A__list.coin-2Dor.org_mailman_listinfo_dip&d=CwICAg&c=Ngd-ta5yRYsqeUsEDgxhcqsYYY1Xs5ogLxWPA_2Wlc4&r=rnUB298ByR5BGgo6vv2b6g&m=SQ6EyINjMS0JVGwJJandNupwBLGNKe61En7rTWKugOY&s=-XIQIHlDQ8zaq0_-XbJ7Y9UA_fut5QgegRRy2uMeO1k&e= <https://urldefense.proofpoint.com/v2/url?u=http-3A__list.coin-2Dor.org_mailman_listinfo_dip&d=CwICAg&c=Ngd-ta5yRYsqeUsEDgxhcqsYYY1Xs5ogLxWPA_2Wlc4&r=rnUB298ByR5BGgo6vv2b6g&m=SQ6EyINjMS0JVGwJJandNupwBLGNKe61En7rTWKugOY&s=-XIQIHlDQ8zaq0_-XbJ7Y9UA_fut5QgegRRy2uMeO1k&e=> 
> 
> 
> 
> -- 
> Dr. Ted Ralphs
> Visiting Researcher, Zuse Institute Berlin
> Professor, Lehigh University
> (610) 628-1280
> ted 'at' lehigh 'dot' edu
> coral.ie.lehigh.edu/~ted <http://coral.ie.lehigh.edu/~ted>

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://list.coin-or.org/pipermail/dip/attachments/20170216/60dc1c89/attachment.html>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: LP.lp
Type: application/octet-stream
Size: 3367 bytes
Desc: not available
URL: <http://list.coin-or.org/pipermail/dip/attachments/20170216/60dc1c89/attachment.obj>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://list.coin-or.org/pipermail/dip/attachments/20170216/60dc1c89/attachment-0001.html>
-------------- next part --------------
An embedded and charset-unspecified text was scrubbed...
Name: LP_blocks.txt
URL: <http://list.coin-or.org/pipermail/dip/attachments/20170216/60dc1c89/attachment.txt>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://list.coin-or.org/pipermail/dip/attachments/20170216/60dc1c89/attachment-0002.html>
-------------- next part --------------
An embedded and charset-unspecified text was scrubbed...
Name: DoPriceCut0_terminal_output.txt
URL: <http://list.coin-or.org/pipermail/dip/attachments/20170216/60dc1c89/attachment-0001.txt>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://list.coin-or.org/pipermail/dip/attachments/20170216/60dc1c89/attachment-0003.html>
-------------- next part --------------
An embedded and charset-unspecified text was scrubbed...
Name: doPriceCut1_terminal_output.txt
URL: <http://list.coin-or.org/pipermail/dip/attachments/20170216/60dc1c89/attachment-0002.txt>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://list.coin-or.org/pipermail/dip/attachments/20170216/60dc1c89/attachment-0004.html>