[Coin-bcpdiscuss] BCP error : couldn't select branching object

[Lasse Nisted]

Hello,

I had the same problem. It was discussed in this thread
http://list.coin-or.org/pipermail/coin-bcpdiscuss/2006-March/000057.html

Maybe it helps?

- Lasse Nisted

On 12/18/06, Matteo Salani <matteo.salani at epfl.ch> wrote:
> Hello,
>
> Developing a Branch and Price algorithm I got this error:
>
> LP : No var/cut in pool but couldn't select branching object.
>
> I checked in the list but I cannot find where the solution proposed by: *Miroslav Karamanov
> http://list.coin-or.org/pipermail/coin-discuss/2005-October/001643.html
> should be implemented...
>
> Unfortunately I don't have any other idea for the moment...
> *
> I switched on all the output routines of LP and it seems (this is only my guess...) that integrality check fails
> and then select_branching_candidates is called but no candidates (since all var are integral) are found.
>
> LP:   In iteration 4 BCP generated 0 cuts and 0 vars before calling branch()
>  LP: Default display_lp_solution() executed.
>   LP : Displaying LP solution (FinalRelaxedSolution) :
>   LP : Displaying solution :
>   Algo  var (internal index:    -86                    ) at 1.0000
>   Algo  var (internal index:   -151                    ) at 1.0000
>   Algo  var (internal index:   -251                    ) at 1.0000
>  LP: Default select_branching_candidates() executed.
>  LP : No var/cut in pool but couldn't select branching object.
>
>
> Matteo
>
>
>
>
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