[Scip] How good are SCIP solutions?

[Liffey1986@gmx.de]

Hi Michael and Stefan,

thanks a lot for your answers. They helped me a lot to understand better how SCIP works.

Regards
Ina

-------- Original-Nachricht --------
> Datum: Sat, 24 Nov 2012 15:07:50 +0100 (MET)
> Von: michael.winkler at zib.de
> An: Liffey1986 at gmx.de
> CC: scip at zib.de
> Betreff: Re: [Scip] How good are SCIP solutions?

> Hi Ina,
> 
> for minimization problems the solution with the smaller value is the
> better solution. But, it might happen, that due to numerics, some solution
> are not feasible in the original problem.
> 
> If you run SCIP from command line with the "-f" option, the last solution
> is checked in the original problem and if it violates some constraints or
> bounds then there will be a message about it.
> If you run SCIP from the interactive shell or with the "-c" option (from
> command line) you need to call "checksol" after "optimize", to check the
> best known solution in the original problem.
> 
> I don't know the tolerances that were used to check the solutions, for
> which the solutionvalues on the MINLPlib are given.
> 
> Best,
> Michael
> 
> > Dear All,
> >
> > I'm using SCIP to solve MINLPs. I tried to solve some instances from
> > libraries such as the MINLPLib.
> > In these libraries the best solutions are usually given. But how do I
> know
> > which solution is the better one, the given solution or the solution I
> got
> > from solving the instance with SCIP? Suppose I have a minimization
> > problem, can I then always assume that the smaller objective value is
> the
> > better one?
> >
> > Regards,
> > Ina
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> >
> 
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