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Re: [Help-glpk] [Fwd: glp_intopt conversion of solutions via callback]

From: Michael Hennebry
Subject: Re: [Help-glpk] [Fwd: glp_intopt conversion of solutions via callback]
Date: Mon, 18 Jan 2016 10:44:24 -0600 (CST)
User-agent: Alpine 1.00 (DEB 882 2007-12-20)

On Sat, 16 Jan 2016, Chris Matrakidis wrote:

On 16 January 2016 at 17:17, Sascha Brügmann <address@hidden>

Michael Hennebry <hennebry <at>> writes:
Perhaps it would be a good idea to make the presolving and
scaling transformation available to the user program.
It could just be a matter of documentation.
The information must already be somewhere,
otherwise glpsol could not invert it.
Yes, thats what I'm talking about!

Unfortunately it's not just a matter of documentation: internally, only the
transformations to convert solutions of the preprocessed problem back to
the original problem are available.

That might be sufficient.
I'd be surprised if the transformation were not effectively invertible,
i.e. a feasible solution in the original variables could not
be transformed to a solution for the proprocessed problem.

Michael   address@hidden
"Sorry but your password must contain an uppercase letter, a number,
a haiku, a gang sign, a heiroglyph, and the blood of a virgin."
                                                             --  someeecards

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