[Scip] How to get node constraint

[Stefan Heinz]

Hi Benoit,

I think the stack is not needed since SCIP already provides something 
like that via the active constraints. If you check the binpacking examples

http://scip.zib.de/doc/examples/Binpacking/index.html

this has a ryan/foster branching which is also considered in the pricer 
to create columns/variables which respect the current active branchings.

Best Stefan

On 06/07/2012 04:29 PM, Gerald Gamrath wrote:
> Hi Benoit,
>
> I suppose you implemented a constraint handler that is used to store
> some data at the nodes, as it is suggested in the FAQ?
> What I usually do in this case is to implement a stack in the constraint
> handler, that always contains all constraints corresponding to the
> active nodes, ordered from the root node to the current node. You can
> add this stack to the data of the constraint handler (as an array,
> together with its size and the number of constraints stored), and use
> the CONSACTIVE and CONSDEACTIVE callbacks of your constraint handler to
> put a constraint on top of the stack or remove the topmost constraint.
> Then, you only need an interface method of your constraint handler, that
> returns the topmost constraint, because that is the one of the current node.
>
> This concept is implemented in the storeGraph constraint handler of the
> Coloring example (see examples/Coloring/src/cons_storeGraph.c in your
> SCIP directory or
> http://scip.zib.de/doc/examples/Coloring/cons__storeGraph_8c_source.html),
> just search for all occurences of "stack" for getting the places where
> the stack is managed or used.
>
> Best,
> Gerald
>
>
> Am 06.06.2012 08:53, schrieb bernay at isima.fr:
>> Hi
>>
>>     I am working on a problem which use a pricer and a ryan/foster branching
>> rule. In my pricer, to choose the new variable to price, i need to have
>> the consdata of the constraints of the current node. I know how to get
>> the current node but I don't find any function to get the constraint. So
>> how to get the constraints of the current node?
>>
>> thank for your help
>>
>> Benoit Bernay
>>
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