[SCIP] Using SCIPdisableCons in problem creation stage

[Ngô Lan]

Hi Gregor,


Thank you for your reply. It works now. Would it be possible to add the deleted constraints again to scip? Ideally, when a node is entered again, I would like to enable the constraint instead of creating a new one. My code does not run yet so I haven't had chance to test it.


I also have another problem with the child nodes. So for branching, I created a linear branching constraint and a marker constraint from my constraints handler and added them into a child node (sticking at node is true). However, in subscip when I check in which branch I am at using SCIPconsIsActive, I get true even for the constraints that were not created in this node. Do you have any idea where things might go wrong?


Best,

Lan

________________________________
From: Scip <scip-bounces at zib.de> on behalf of Gregor Hendel <hendel at zib.de>
Sent: 09 October 2019 10:32:17
To: scip at zib.de
Subject: Re: [SCIP] Using SCIPdisableCons in problem creation stage

Good morning Lan,

how about using SCIPdelCons() instead of SCIPdisableCons()?

Let me know if that works for you,
Gregor

Am 09.10.19 um 01:03 schrieb Ngô Lan:

Hi all,


I am solving a project scheduling problem using branch-price-cut and I am having an issue with SCIPdisableCons function. So after each pricing iteration, I will not release the subscip but only free the transformed problem using SCIPfreetransform and modify the objective function of the subscip in the next iteration. During branching, in CONSACTIVE, I will create an additional constraint for the subproblem depending on the branching decision and in CONSDEACTIVE, I will disable the related constraint using SCIPdisableCons. However, I got the error: cannot call method <SCIPdisableCons> in problem creation stage. Do you know another function that can work? Or what should I do differently?


Thank you for your time,


Best,

Lan



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