[Scip] Column Generation: Display columns

[Dimitri Sverdlov]

Thanks a lot, Timo, that helps!

Dimitri

Timo Berthold wrote:
> Hi Dimitri.
>
> What you can do, is the following:
> 1) If you are just interested in the actual solution of the coloring problem,
> you can write it by calling
> SCIP>  write problem foo.csol
> which shows sou the color classes (by corresponds to the columns).
> 2) YOu couls also stop SCIP by some limit, e.g.
> SCIP>  set limits solutions 1
> or
> SCIP>  set limits nodes 1
> and write the MIP relaxation afterwards:
> SCIP>  write mip foo.lp 0 1
>
> I hope this help a bit.
> Best regards,
> Timo
>
>
> E.g., for the problem myciel3 and a solution limit of one, this gives rise to
> the following two files:
>
> myciel3.csol
> -------------------
> myciel3 4 generated by ColumnGenerationColoring
> 0 1 0 1 2 2 1 3 1 2 0
> -------------------
>
>
> myciel3.lp
> -------------------
> Minimize
>   Obj: +1 _var0_ +1 _var1_ +1 _var2_ +1 _var3_
>
> Subject to
> Node-Constraint1:  -1 _var0_ -1 _var2_ -1 _var3_<= -1
> Node-Constraint2:  -1 _var1_<= -1
> Node-Constraint3:  -1 _var0_ -1 _var3_<= -1
> Node-Constraint4:  -1 _var1_<= -1
> Node-Constraint5:  -1 _var2_<= -1
> Node-Constraint6:  -1 _var2_ -1 _var3_<= -1
> Node-Constraint7:  -1 _var1_<= -1
> Node-Constraint8:  -1 _var3_<= -1
> Node-Constraint9:  -1 _var1_<= -1
> Node-Constraint10:  -1 _var2_<= -1
> Node-Constraint11:  -1 _var0_<= -1
>
> Bounds
>   -0<= _var0_
>   -0<= _var1_
>   -0<= _var2_
>   -0<= _var3_
>
> Generals
>    _var0_  _var1_  _var2_  _var3_
>
> End
> -------------------
>
> Am Thursday 03 December 2009 01:33:00 schrieb Dimitri Sverdlov:
>    
>> Hello,
>>
>> I'm working with the Coloring example from SCIP.
>> I wounder how it is possible to display the solution with the
>> interactive optimizer shell in case of column generation.
>> That is, display solution shows the values of the variables, but of
>> course I also want to see the columns corresponding to the variables. Is
>> that possible?
>>
>> Best regards,
>> Dimitri
>>      
>
>