[Scip] A little question about setppc constraint handler

[Jakob Witzig]

Hi He Xingqiu,

yes, you can.

You can use SCIPcreateConsLinear to add your constraints as linear 
constraints and SCIP upgrades your constraints automatically to setppc 
constraints. If you want to create the setppc constraints
directly, then use SCIPcreateConsBasicSetpart (or use 
SCIPcreateConsSetpack and SCIPcreateConsSetcover if you have constraints 
of type 1^T x <= 1 and 1^T x >= 1, resp.).

Best regards,
Jakob

On 05/08/15 13:38, 贺行遒 wrote:
> Hello all,
>
> I'm implementing an ILP problem based on SCIP, and I have a little question.
>
> The documentation of setppc constraint handler says it deals with
> constraints in the form of 1^T x {<=>} 1. Can I use setppc when only
> part of my variables appear in the constraint?
>
> e.g.  All variables: x1, x2, x3, y1, y2
>          Constraint1: x1 + x2 + x3 = 1
>          Constraint1: y1 + y2 =1
> Can I use setppc for these constraints?
>
> Best Regards,
> He Xingqiu
>
>
>
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-- 
Jakob Witzig

Konrad-Zuse-Zentrum für
Informationstechnik Berlin (ZIB)

Division Mathematical Optimization and Scientific Information
Research Group Mathematical Optimization Methods

Takustrasse 7
14195 Berlin

Tel. : +49 (0)30 84185-416
Fax  : +49 (0)30 84185-269
email: witzig at zib.de