building a 64bit version of Pulp that can do resolves

[CraigSchmidt]

Hi There,

I used Pulp earlier this year on a Mac, and had trouble getting a
solver working that could resolve LP models. Now it appears I'm going
to be using a Ubuntu machine. How do I install it so I have access to
a 64 bit solver capable of restarts? I believe CBC can't do
restarts. Do others? It it possible to use app-get to install such a
solver?

Thanks very much,
Craig Schmidt

[Stuart Mitchell]

Ok my best recommendation at the moment is yaposib
http://code.google.com/p/yaposib/ I have cc'ed the developer.

Install instructions are at http://code.google.com/p/yaposib/wiki/Install

I'm not sure if there are examples using resolve, but I just looked in
the code and it seems to be supported (i.e. the solve method calls
resolve if it can)

Unfortunately transparent model updates on a problem for resolve is
not supported yet in pulp (it is supported only on a per solver basis)
so you may need to use the solver object provided in pulp to change
the model directly then resolve.

In practice I develop in pulp, change the model and rebuild the model
each time, then I speed it up by making changes in the solver class
and using resolve.

Stu

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Stuart Mitchell
PhD Engineering Science
Freelance Programmer and Optimisation Expert
www.stuartmitchell.com

[Christophe-Marie Duquesne]

I confirm what Stuart said. Just mail me if you have trouble compiling
yaposib...

Cheers,
Christophe-Marie