[Top][All Lists]

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: [Help-glpk] post-processing without defined variables?

From: glpk xypron
Subject: Re: [Help-glpk] post-processing without defined variables?
Date: Mon, 02 Jul 2012 07:45:34 +0200

Hello Kevin,

either you can use the GLPK library from another programming language (C, Java, 
...) or you can use scripting around glpsol, cf.

Best regards


-------- Original-Nachricht --------
> Datum: Sat, 30 Jun 2012 19:52:41 -0400
> Betreff: [Help-glpk] post-processing without defined variables?

> Hello GLPK List,
> I see from the GLPK Wikibook that there's no ability to create reporting 
> variables (err, just learned that others call them "defined variables").
> I want to explore the last sentence in that section ("But you can use a 
> structural variable and a constraint instead to achieve the same effect 
> — the downside being that this formulation may render your problem 
> harder to solve").  The models that I'm working with are necessarily 
> large (roughly 1e5 [C] x 1e5 [R], give or take an order of magnitude 
> depending on the input), and I'd like to avoid adding any more variables 
> to the solver's matrix.
> Given that I can't create constraints /after/ a solve statement (i.e. to 
> re-solve starting from the previous solution), does that mean that my 
> only option is a post-GMPL step with another tool (e.g. C, Perl, Python)?
> Thanks,
> Kevin
> _______________________________________________
> Help-glpk mailing list
> address@hidden

reply via email to

[Prev in Thread] Current Thread [Next in Thread]