[Clp] switch from gusek (GLPK) to clp

[Meketon, Marc]

Yes. For example look at the Python based Pyomo modeling language. It has support for CBC.  Another is JmP which based on the new-ish language Julia from MIT.

Sent from my iPhone

On Jul 16, 2015, at 3:49 AM, Louis Mathieu <louis.mathieu at student.ecp.fr<mailto:louis.mathieu at student.ecp.fr>> wrote:


Hello Marc,


Thank for your answer,


One last question, is there any other solution to build the .mps file and have some output data (like printf in glpk) using clp ? If I do not use glpk anymore it does not bother me, I can rewrite my model in another language.


Regards,


LM



________________________________
De : Meketon, Marc <Marc.Meketon at oliverwyman.com<mailto:Marc.Meketon at oliverwyman.com>>
Envoyé : mercredi 8 juillet 2015 16:23
À : Louis Mathieu; clp at list.coin-or.org<mailto:clp at list.coin-or.org>
Objet : RE: switch from gusek (GLPK) to clp


I do not believe anyone has completed the GLPK to CLP (or CBC) link.  Please look at email from Heinrich Schuchardt:

https://lists.gnu.org/archive/html/help-glpk/2015-05/msg00012.html



Heinrich also sent me the following:

“at the time of my testing GMPL postsolve processing did not work. As described in the Wikibook I was only able to export to CSV.

The relevant coding is in
https://github.com/coin-or/CoinUtils/blob/master/CoinUtils/src/CoinMpsIO.cpp
method CoinMpsIO::readGMPL”



I tend to use GLPK to write out the “freemps” version of the .mps file, call CBC, have CBC write out a solution file, and then read in the solution file.  So this is by file transfer, and it means that any statements you make after the “solve;” statement in GLPK is missing.  It also means a lack of integration with GUSEK.



-Marc



From: clp-bounces at list.coin-or.org<mailto:clp-bounces at list.coin-or.org> [mailto:clp-bounces at list.coin-or.org] On Behalf Of Louis Mathieu
Sent: Wednesday, July 08, 2015 8:17 AM
To: clp at list.coin-or.org<mailto:clp at list.coin-or.org>
Subject: [Clp] switch from gusek (GLPK) to clp



Hello,



I am currently working on a linear programming model.



I started using GLPK (in fact Gusek). It allowed me to just write my constraints define my variables ... and solve my model.



I would like to switch to CLP which seems faster for my model.



Could you explain me how to replace Gusek by CLP ? I understood I have to develop in C++ using the API to use CLP solver, but CLP seems to be solving matrix problems (.mps), is there any way feed clp using a model ?



Regards,



L.M

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