[Scip] B&price

[Jakob Witzig]

Hi Emily.

The method SCIPgetSolVal returns the value of a given variable within a 
given solution. The returned value should be integer (wrt numerical 
tolerances) if your given variable is integer and the solutions is 
feasible. SCIP uses by default a tolerance of 1e-09 to check if a value 
is integral or not. Is your returned value in this range?

Best regards,
Jakob

On 04/13/15 03:51, Aao Du wrote:
> Hi Jacob,
>
> Thanks for the reply. I actually fixed that problem.
>
> However, I have a quite basic question. How can I get the value of
> integer variables after being solved. I was using SCIPgetsolval, but I
> realized it is not giving integer values., and I could not figure out
> how to do it!
>
> Thanks,
> Emily
>
>
>
> On Thu, Apr 9, 2015 at 3:42 AM, Jakob Witzig <witzig at zib.de
> <mailto:witzig at zib.de>> wrote:
>
>     Hi Emily,
>
>     On 04/08/15 23:02, Aao Du wrote:
>
>
>         src/scip/heur_coefdiving.c:__724: heurExecCoefdiving: Assertion
>         `cutoff ||
>         (lpsolstat != SCIP_LPSOLSTAT_OBJLIMIT && lpsolstat !=
>         SCIP_LPSOLSTAT_INFEASIBLE && (lpsolstat != SCIP_LPSOLSTAT_OPTIMAL ||
>         SCIPisLT(scip, SCIPgetLPObjval(scip),
>         SCIPgetCutoffbound(scip))))' failed.
>         Aborted (core dumped)
>
>     Which of the terms violates the assertion?
>
>         The algorithm is working for small instances, but is giving this
>         error
>         for larger.
>
>     I don't think there is a relation between the size of the instances
>     and this error ;-)
>
>     Best,
>     Jakob
>
>     --
>     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 <tel:%2B49%20%280%2930%2084185-416>
>     Fax  : +49 (0)30 84185-269 <tel:%2B49%20%280%2930%2084185-269>
>     email: witzig at zib.de <mailto:witzig at zib.de>
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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