[SCIP] How to get the Dual Solution of the cuts added using a constraint handler

[Naga Venkata Chaitanya Gudapati - nagavenkata.gudapati@studio.unibo.it]

Hello Benjamin and SCIP community,

I had been searching all over the internet on  how to iterate through the rows added by the constraint handler so that I can get their dual price.  But I am still a bit unsure how to obtain it.

Should I be storing the rows that are added by a constraint handler  in a separate data structure, so that I can iterate through them later? Or is there a way to get the rows from the SCIP data structure?

I probably am getting ahead but I would like to able to manipulate these rows added by the constraint handler to add more variables (due to the pricing phase). Any help is greatly appreciated.

Thanks and Regards,
Naga

________________________________________
From: Scip <scip-bounces at zib.de> on behalf of Naga Venkata Chaitanya Gudapati - nagavenkata.gudapati at studio.unibo.it <nagavenkata.gudapati at studio.unibo.it>
Sent: Monday, March 30, 2020 11:37 AM
To: Mueller, Benjamin; scip at zib.de
Subject: Re: [SCIP] How to get the Dual Solution of the cuts added using a constraint handler

Thank you! Now I think I have to figure how to get the cuts added by the constraint handler.

Thanks and Regards,
Chaitanya
________________________________
From: Mueller, Benjamin <benjamin.mueller at zib.de>
Sent: Monday, March 30, 2020 5:35:48 PM
To: Naga Venkata Chaitanya Gudapati - nagavenkata.gudapati at studio.unibo.it <nagavenkata.gudapati at studio.unibo.it>; scip at zib.de <scip at zib.de>
Subject: Re: [SCIP] How to get the Dual Solution of the cuts added using a constraint handler

Dear Naga,

you can access the dual solution of a SCIP_ROW by using
SCIProwGetDualsol(). The method SCIPgetDualsolLinear() is returning the
value of SCIProwGetDualsol() for the row that has been generated by a
linear constraint.

Best,
Benjamin

On 30.03.20 11:19, Naga Venkata Chaitanya Gudapati -
nagavenkata.gudapati at studio.unibo.it wrote:
> Hello,
>
> I might have missed something rudimentary in the SCIP documentation but is there a way to get the dual prices of the added cuts? I add these cuts using a constraint handler.  I know about SCIPgetDualsolLinear but can it also be used for cuts?
>
> I am adding a cut and I need to get its dual price so that I can take it into account for the pricing problem after which I can add a new variable.
>
> Thanks for your help and please let me know if I need to provide any further information.
>
> Regards,
> Naga
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