[SCIP] Reoptimization

[Witzig, Jakob]

Looks like an issue with the Benders coding in combination with reoptimization. Please open a bug report with a minimal not working example here: https://scipopt.org/bugs.php

Cheers,
Jakob

Am 28.09.2021 12:55 schrieb Marco Correia <marco.v.correia at gmail.com>:
Sorry, what works is 2.4.5.6  (Including step 1 also leads to the above error).

On Tue, Sep 28, 2021 at 11:53 AM Marco Correia <marco.v.correia at gmail.com<mailto:marco.v.correia at gmail.com>> wrote:
Thanks Jakob,

Step 4 is actually the only one that seems to work (that is 1,2,4,5,6 works). Instead doing 1,2,3,5,6 gives me

[cons.c:2399] ERROR: constraint handler <benderslp> already initialized

in step 5.

Am I missing some other step?

On Tue, Sep 28, 2021 at 11:47 AM Witzig, Jakob <witzig at zib.de<mailto:witzig at zib.de>> wrote:
Hi Marco,

Step 4 is not needed.

Cheers,
Jakob


Am 28.09.2021 12:37 schrieb Marco Correia <marco.v.correia at gmail.com<mailto:marco.v.correia at gmail.com>>:
Hi,

I have a model I would like to solve, and then add a constraint and change the objective, and then solve again. My understanding of the necessary steps is:

1. SCIPenableReoptimization(true)
2. [Create and solve model]
3. SCIPfreeReoptSolve
4. SCIPfreeTransform
5. [Add new constraints and change objective]
6. [Solve modified model]

This doesn't seem to work as it is, but when omitting step 1 and 3 it works. I guess the other steps are also important, right?

Thank you
Marco


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