[Clp] question on gubVersion

[John Forrest]

Fei,

gubVersion returns a shrunken model with the matrix type 
ClpDynamicMatrix which has the extra rows and columns and the idea is 
that primal will then use that in a gub style algorithm.  You may find 
it easier to look at the gub examples in Clp/examples.

I would not be surprised if something has got broken - but that can be 
fixed.

Give Richard Van Slyke credit as well as George Dantzig  - I think GUB 
was being developed at Berkeley when I was doing a Masters there!

John Forrest


On 07/05/14 16:23, Fei Peng wrote:
> Hello clp community,
>
> I have a question about the routine resolveGub and gubVersion included 
> in osiClpSolverInterface and clpSimplexOther, respectively. I 
> was thinking that this implements the GUB simplex by Dantzig, but it 
> seems like gubVersion only shrinks the model, gives the model back to 
> the solverinterface and let it do primal()? maybe I'm not reading it 
> careful enough but could someone advise if this is what it's supposed 
> to do?
>
> Thanks!
> Fei
>
>
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