[SCIP] Separator not called

[Emanuel Delgadillo]

Thanks to everyone for your answers. It's already solved. I changed a bit
my code to use the C interface and then I could find my bug.

Best,
Emanuel

2017-09-14 4:59 GMT-03:00 Gerald Gamrath <gamrath at zib.de>:

> Dear Emanuel,
>
> another guess: did you define your variables to be integral and does SCIP
> actually do any branching? If you did not define your variables to be
> integral and also did not add a constraint handler to check solutions
> (e.g., for integrality in the original space), your LP solution after
> pricing might just be declared optimal. If your separator should ensure a
> restriction on your feasible space, it should better be a constraint
> handler. A separator should only generate cuts to improve the LP
> relaxation, but should not be part of the model definition, i.e., should
> not change feasibility of any (integer) feasible solution.
>
> Best,
> Gerald
>
> On 14.09.2017 09:23, Gregor Hendel wrote:
>
> Dear Emanuel,
>
> I am sorry for your troubles. A good first step to debugging unexpected
> plugin behavior is to
> add the define
>
> #define SCIP_DEBUG
>
> at the very top of the file src/scip/sepa.c. After recompiling SCIP and
> inputting a problem to optimize,
> you should see a lot of prose explaining why SCIP decides to run (or not
> to run) your plugin.
>
> If you need further assistance, please add information about concrete
> parameter values for priority, maxrounds, frequency, and also the DELAYED
> flag.
>
> Kind regards,
> Gregor
>
>
>
>
> Am 13.09.2017 um 17:29 schrieb Emanuel Delgadillo:
>
> Hi,
>
> I have implemented a branch-price with SCIP and I want to add a separator.
> I coded it with C++ extending ObjSepa class and included it to scip, but it
> is never called.
> I have output messages in it, and I have checked maxrounds(root) and
> maxcuts(root) are not 0 and also tried with different values for priority
> and frequency. I have my own version of includeDefaultPlugins, which
> doesn't include any other default separator.
> I have already checked documentation, examples and previous similar
> threads, but I couldn't solve it. I also checked some files of source code
> (solve.c) to find what I'm doing wrong, without success.
> Any ideas?
>
> Thanks in advance,
> Emanuel
>
>
>
>
>
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