[Clp] pivot on the one specific variable

[Thomas Vincent]

Hi Siamak,

First of all, I mainly use OsiClp, not Clp, so please everyone feel free
to correct me if I'm wrong.

The pivot() function is what you need as each column represents a
variable of your problem. You just have to pivot a non-basic variable
(i.e. your column) with a basic variable (i.e. a column with almost only
0s and just one 1).
You can get the indices of the basic variables using the getBasics(int*
index) function: index[i] will give you the column number of the ith
basic variable.

Just for my curiosity, how do you compute the reduced costs of the
second (and other) objective(s)?

Cheers,
Thomas

Le 27/04/2011 03:44, SIAMAK MORADI a écrit :
> Hi everyone
> I am new to Clp, so sorry if this question is easy for you.
> After I solve a problem in Primal and find the optimal answer I want topivot on 
> the one specific variable, I know that this makes the objective worse but I need 
> this to solve multi-objective problems, I have tried the pivot(); function but 
> it seems that It pivots on two columns shouldn't it take a row and a column? I 
> was wondering if you could explain how I could achieve this?
> Thanks a lot
> Cheers
> Siamak
> 
> 
> 
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