[Scip] How can SCIP solve division?

[Ambros Gleixner]

Dear Wei,

SCIP can handle powers of negative exponents, but the current Zimpl 
version 3.3.2 does not support this.  It will be contained in the next 
Zimpl release.

In order to work around this, I attached you a Zimpl file with three 
possible reformulations of x^-p that work in Zimpl.  The resulting 
models, however, have additional artificial variables and probably 
perform worse in SCIP.  For a proof-of-concept model it may work, though.

We will announce as soon as the new Zimpl release is available.

Kind regards,

ambros


Am 21.04.2014 09:26, schrieb weikaimas:
> Hi,
>      I want to get the value of sum(1/x[i]), which x[i] are variables,
> using SCIP. I have used the format ZIMPL to build my model, however, it
> can not solve sum(1/x[i]). Could you give me some suggestions about the
> my problem.
>    Thanks.
> 2014-04-21
> ------------------------------------------------------------------------
>    Wei kai
> School of Economics & Management
> Tongji University, Shanghai 200092, China
>
>
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-- 
____________________________________________________________
Ambros M. Gleixner
Zuse Institute Berlin - Matheon - Berlin Mathematical School
http://www.zib.de/gleixner