[Coin-discuss] Generating both cuts and vars

[Laszlo Ladanyi]

Oops, I also forgot to mention those....
Well a variable is "ineffective" if its lower and upper bounds are both 0.
This can happen by reduced cost fixing, so you could disable that with
BCP_DoReducedCostFixingAtAnything 0
BCP_DoReducedCostFixingAtZero 0

However, and even more general solution for your problem is to override the
methods select_vars_to_delete() and select_cuts_to_delete(). You can look at
the default implementation in BCP_lp_user.cpp. Whatever indices you return in
the deletable vector, the corresponding vars/cuts will be deleted.

--Laci

On Fri, 30 Jun 2006 fmargot at andrew.cmu.edu wrote:

> 
> Use the parameter file. Set:
> 
> BCP_IneffectiveConstraints              0
> 
> I don't know how to deal with variables.
> 
> Francois
> 
> On Fri, 30 Jun 2006, Heesu Hwang wrote:
> 
> > Hi, Laci.
> >
> > I am using cuts in BB example, i.e., class BB_cut : public BCP_cut_algo, public
> > OsiRowCut.
> > When I threw cuts into the rows vector within XX_lp::cuts_to_rows(), COIN seems
> > to delete some ineffective cuts.
> > I tried *->make_non_removable, but it doesn't work.
> > Also it doesn't work for vars either.
> > Can I keep all the cuts and vars that I've generated, even they are not
> > ineffective?
> >
> > Thanks,
> >
> > Heesu Hwang.
> >
> >
> >
> _______________________________________________
> Coin-discuss mailing list
> Coin-discuss at list.coin-or.org
> http://list.coin-or.org/mailman/listinfo/coin-discuss
>