[Scip] use of SCIPgetDualsolLinear(scip, cons)

[Ambros Gleixner]

Hi Veronica,

If you have nonzero bounds on your variables then you need to consider 
their reduced costs.  Might that be the case?

Best regards,
Ambros


Am 18.02.2015 um 16:25 schrieb Veronica Dal Sasso:
> Hello everyone.
> I'm not sure about the use of the function SCIPgetDualsolLinear().  I'm
> trying to solve a linear program using column generation, and at each
> iteration I get the values of the dual variables using
> SCIPgetDualsolLinear(scip, cons). I expect these dual variables to be
> the ones that satisfy the complementary slackness conditions and that,
> if I compute the dual objective function, give the same value as for the
> primal objective function but gives an unfeasible solution to the dual
> problem. Instead, I find that the dual optimal objective function has
> not the same value. Is it possible that I misunderstood the meaning of
> SCIPgetDualsolLinear() or simply I'm making some sort of error that I
> haven't found yet in the computing of the dual objective function's value?
> Thank you in advance,
> Veronica Dal Sasso
>
>
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-- 
______________________________________________________________
Ambros M. Gleixner
Zuse Institute Berlin - TU Berlin - Berlin Mathematical School
http://www.zib.de/gleixner