[SCIP] Question about relaxator

Tristan Gally gally at mathematik.tu-darmstadt.de
Mon Dec 14 07:27:59 CET 2015

Dear Kimura,

unfortunately SCIP currently does not store the relaxation solutions for 
all nodes in the branch and bound tree (you can only get the most 
current one). Therefore, you have to save the solution yourself. One 
possibility to do so is to create a constraint which stores the solution 
and enable "stickingatnode", so that it is kept at this node and not 
made global, even if that would be possible. Also the constraint should 
always return feasible, so that it does not influence the solving 
process apart from storing the solution. If you later want to use a 
warmstart, you can then fetch the corresponding constraint to extract 
the needed data.


On 12/13/2015 09:01 PM, ma214016 at math.kyushu-u.ac.jp wrote:
> Dear all,
> Hello, I am Kimura. Thank you for adding me to the mailing list.
> I have a question. I want to use a warmstart when my relaxator
> solves convex NLPs. Please teach me how to call the relaxation
> solution of the parent problem.
> Best regards,
> Keiji Kimura
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> Scip at zib.de
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