[BCP] Column generation - Perturbation

[Laszlo Ladanyi]

The cost of a var (core or algorithmic) cannot be changed once the 
variable is created. However, you can create a new var with the same 
column but different cost... Right hand sides of constraints (or 
similarly, bounds on variables) are slightly different. While they 
cannot be changed in the object itself, you can do a branch with just 
one child and change the bound that way. Or, if it's an algo object, 
you can generate the sam eobject again with different bounds.

I hope this helps,
--Laci

On Sun, 29 Mar 2009, Ashwin wrote:

> Hi all,
> I have a quick question in BCP. Is there a way to change the right
> hand side and cost coefficients of a variable that was already
> generated and entered in the model? Also, I would like to know if
> this is possible with a core variable.
> Thanks in advance.
>
> Best,
> Ashwin
>
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