[Scip] Branch and Price method

[Gerald Gamrath]

Hi Mahdi,

does this happen already at the root node or after branching? If it's
after branching, how do you perform branching?

Is the delay flag of your pricer set to TRUE?

Do you have upper bounds on your variables? That is a problem in
branch-and-price, because a variable at its upper bound can have
negative reduced costs. This can be avoided by marking the upper bound
to be lazy, which is probably what you read about in the FAQ?

How does your problem look like?

Best,
Gerald

On 17.04.2013 15:15, Mahdi Noorizadegan (DIMAP) wrote:
> Hi,
>
> I am having problem in adding columns in B&P method.
> for some reason which I dont know! a column is identified and added
> twice to the problem. This happens for some columns not all.
> I am quite sure that my pricing problem is correct.
> some thing has been explained in FAQ but I dont quite understand it.
> Could you please let me know what I need to do to avoid this?
>
> Cheers,
> MNz
>
>
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