[Scip] Early Branching issues

[Stefan Heinz]

Hi Jose,

It should be possible to turn on the separation. The bool parameter you 
changed from TRUE to FALSE has nothing to with turning on or off the 
"OFF" mode.

http://scip.zib.de/doc/html/scip_8h.shtml#af91abf95639f1bf2022c11d13a032b10

It does the parameter change "quite" or not. Meaning with or without an 
output via the message handler. You need to change the second parameter 
to one of the followings:

* SCIP_PARAMSETTING_DEFAULT which are the default values of all 
separating parameters

* SCIP_PARAMSETTING_FAST such that the time spend for separating is 
decreased

* SCIP_PARAMSETTING_AGGRESSIVE such that the separating is done more 
aggregative

* SCIP_PARAMSETTING_OFF which turn off all separating

Probably you want to try SCIP_PARAMSETTING_DEFAULT first.

Best Stefan

On 02/06/2013 09:59 PM, Jose L Walteros wrote:
> Hi all,
>
> I am solving a problem via Branch and Price. For one of my experiments, I
> am interested in stopping the pricing at a certain point in the B&B tree to
> heuristically obtain a good solution. Since I am no longer pricing new
> variables, I am wondering if it is possible to activate the separate
> algorithms to add default SCIP cutting planes after no more columns are
> generated.
>
> I tried to play with SCIP_CALL( SCIPsetSeparating(scip,
> SCIP_PARAMSETTING_OFF, TRUE) ); changing it from TRUE to FALSE but I did
> not get the expected beheavior.
>
> Tanks
>
> -Jose
>
>
>
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