[Coin-discuss] OsiCbc

[Leo Lopes]

Thanks, John.

I guess this is where I was confused: I thought Cbc was designed to be 
similar to cplex or glpk, where heuristics are an intrinsic part of the 
code and the default options are expected to be used most of the time. 
In that case, it would make more sense for Cbc to have its own Osi 
driver, even though it can itself use another solver engine (again 
through Osi) to solve LPs.

Now, after reading the docs (duh), I get the impression that Cbc is more 
similar in concept to Symphony, in the sense that its primary goal is to 
make it easy for a knowledgeable analyst to build custom b&c-based 
searches quickly.

Is the observation above correct?

That doesn't mean that Cbc couldn't have an Osi interface (since in fact 
Symphony does have one), but I see how the different design goals makes 
the Osi interface a somewhat lower priority. So I'd like to make a 
feature request for an OsiCbc driver. Pretty please, but I won't hold my 
breath, unless I find time to do it myself!

Thanks,
Leo.

John J Forrest wrote:
> 
> Cbc is designed to USE any solver in OsiSolverInterface class so it 
> would create problems if there was an OsiCbc class.  Although Cbc can 
> use any solver it does have a slight preference for the OsiClp interface 
> as that gives a totally Coin solver.
> 
> John Forrest
> 
> 
> *Leo Lopes <leo at sie.arizona.edu>*
> Sent by: coin-discuss-bounces at list.coin-or.org
> 
> 03/29/2005 07:09 PM
> Please respond to
> leo and Discussions about open source software for Operations Research   
>      
> 
> 
> 	
> To
> 	coin-discuss at list.coin-or.org
> cc
> 	
> Subject
> 	[Coin-discuss] OsiCbc
> 
> 
> 	
> 
> 
> 
> 
> 
> Maybe this question has an obvious answer, but how come there isn't an
> OsiCbc library?
> 
> Thanks,
> Leo.
> 
> -- 
> ========================================================================
> Leonardo B. Lopes                                    leo at sie.arizona.edu
> Assistant Professor                                        (520)621-2342
> SIE - University of Arizona  http://www.sie.arizona.edu/faculty/leolopes
> 
> _______________________________________________
> Coin-discuss mailing list
> Coin-discuss at list.coin-or.org
> http://list.coin-or.org/mailman/listinfo/coin-discuss
> 
> 
> ------------------------------------------------------------------------
> 
> _______________________________________________
> Coin-discuss mailing list
> Coin-discuss at list.coin-or.org
> http://list.coin-or.org/mailman/listinfo/coin-discuss

-- 
========================================================================
Leonardo B. Lopes                                    leo at sie.arizona.edu
Assistant Professor                                        (520)621-2342
SIE - University of Arizona  http://www.sie.arizona.edu/faculty/leolopes