[Clp] Clp Digest, Vol 109, Issue 7

[Wolfgang Hartmann]

Just to make sure that I solved this Problem.
By some ridiculous mistake, I did specify not enough
iterations in my Interface to Clp. Sorry, for bothering,
with a little bit more patience I would have found that
without contacting the community.

Unortunately, compared with some other LP methods
is my current Interface to Clp's primal and dual Simplex
algorithm a Little bit slow. But that may have to do with
the Default factorization (which I think is dense). I will
enhance my Interface with some additional sparse factorizations.

There are quite a number of methods set up, mostly by Tim Davis,
(has moved from Florida to Texas A&M)?
Could anybody point me to one or two of the "best"?

Wolfgang in Heidelberg




On Wed, Jul 30, 2014 at 9:44 AM, Wolfgang Hartmann <cmat.wolfgang at gmail.com>
wrote:

> Hi,
> I'm using the C Interface for Clp!!
>
> that means I'm calling (among others):
>   -  irc = Clp_readMps(model,ofil,1,0);
>   - one of the following four:
>     irc = Clp_dual(model,ifValuesPass);
>     irc = Clp_initialDualSolve(model);
>     irc = Clp_primal(model,ifValuesPass);
>     irc = Clp_initialPrimalSolve(model);
>
> For larger Problems, however, the Solutions I get are infeasible.
> With any of the methods above!
>
> I had a look at the C++ examples and thought maybe running something like
>    Presolved.Info.presolvedModel(model)
> would help getting some more reasonable result.
>
> However, I did not find something similar in the C Interface source code
> distributed with Clp.  Is it just me or is there anybody else of you who
> works
> with that C Interface? How do you call
>    Presolved.Info.presolvedModel(model)
> using the C Interface??
>
> Thanks,
> Wolfgang
>
>
> --
> Time is not Onedimensional!
> And even if it were - it would still be too difficult for me to handle.---
> Wolfgang M. Hartmann
>
>


-- 
Time is not Onedimensional!
And even if it were - it would still be too difficult for me to handle.---
Wolfgang M. Hartmann

On YouTube: http://www.youtube.com/watch?v=HE16lQWprwg&feature=youtu.be
 www.wcmat.com/wolfgang
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