[Coin-discuss] problem with OsiCpx getRowUpper

[Matthew Saltzman]

Michal-

Could you file a ticket at http://projects.coin-or.org/Osi/newticket?

You'll need to register (if you haven't already) and log in.

Thanks.

On Wed, 2008-08-13 at 13:29 -0400, Michal Kaut wrote:
> Better description of the issue:
> 
> On the first call of OsiCpxSolverInterface::getRowUpper(), OsiCpx 
> creates a vector rowupper_ of rhs upper bounds and returns it.
> The problem starts when I change some of the RHS and call the 
> getRowUpper() - since rowupper_ exists from before, it is just returned 
> as it is, i.e. with the values valid at the time of the first call.
> Since rowupper_ is private, there is no chance to change or delete it.
> 
> I think that the best (and easiest) way of dealing with the problem is 
> to do it the same way as in for ex. OsiGlpk: update the rowlower_ and 
> rowupper_ vectors each time RHS is changed, i.e. in setRowLower, 
> setRowUpper and setRowBounds methods (if the vectors exist).
> This would be a very minor change in the code...
> 
> 
> Thanks.
> 
> Ragards,
> Michal
> 
> 
> 
> Michal Kaut wrote:
> > Hello,
> > 
> > I am having problem with getRowUpper and getRowLower when using OsiCpx - 
> > they just return zero. When I switch to OsiCbc or OsiGlpk, everything 
> > works OK. Setting the bounds also seems to work, though I can't directly 
> > check the values.
> > 
> > I am using a trunk version of FlopCpp, which links to a trunk version of 
> > Osi - but I have had the same problem a long time ago, but at that time 
> > I "solved" it by using another solver...
> > 
> > 
> > Is there some known workaround?
> > 
> > 
> > Thanks,
> > Michal
> > _______________________________________________
> > 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
-- 
                Matthew Saltzman

Clemson University Math Sciences
mjs AT clemson DOT edu
http://www.math.clemson.edu/~mjs