Re: [Help-glpk] [Fwd: Can MathProg Translator generate C or C++ code snippet?]

[Haroldo Gambini Santos]

On 08-02-2012 12:12, Andrew Makhorin wrote:
> -------- Forwarded Message --------
> From: Sebastian Kranz<address@hidden>
> To: address@hidden
> Subject: Can MathProg Translator generate C or C++ code snippet?
> Date: Wed, 08 Feb 2012 10:57:02 +0100
>
> Dear Developers,
>
> I find the possibility of GLPK to read and process
> MathProg models extremely helpful. Thanks a lot for
> creating the translator!
>
> In my view, MathProg is usually a much more convenient
> form to specify a linear program than directly filling the
> constraint matrix with numbers. However, I have an
> application that has to solve the same model many times
> with different specifications of the sets and the
> parameters of the MathProg model. In this application,
> creating every time a new instance via the MathProg
> translator seems rather slow in terms of computing speed.
>
> I wondered whether it would be possible to add a function
> to the MathProg translator that can create from the
> internal model representation of a given MathProg model
> some C code snippet. The snippet would be a C (or C++)
> function that takes sets and parameters as vector input
> and returns the constraint matrix, bounds and objective
> coefficients of the linear program as output. I could
> imagine that this could be quite useful, since one could
> specify the logic of the problem in the convenient
> MathProg form, but still can embed in the application fast
> code to generate the linear programs.
Usually the slow part of the process is not generating the model but 
solving it - specially for integer programs.

As a GLPK user I'm much more interested in improvements in the 
robustness of the liner programming solver and in the algorithms for 
integer programming than some speedup in generating the model.

GLPK is still one of the slowest solvers:
http://plato.asu.edu/ftp/milpc.html

There is a long way to go for improving the solver code.

Cheers,

Haroldo

> However, I have no clue whether that is possible or hard
> it would be to create such a snippet generator.
>
> Best wishes,
> Sebastian
>
>
>
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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/