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Re: [Help-glpk] Undefined or infeasible solution?
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From: |
Andrew Makhorin |
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Subject: |
Re: [Help-glpk] Undefined or infeasible solution? |
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Date: |
Wed, 11 Sep 2013 22:53:23 +0400 |
> > This may happen when infeasibility is detected by the mip preprocessor
> > (not by the mip solver), which _erroneously_ does not change the mip
> > solution status, so it remains undefined. In any case, if you see on the
> > terminal something like follows:
> >
> > Preprocessing...
> > PROBLEM HAS NO PRIMAL FEASIBLE SOLUTION
> >
> > it means that no integer feasible solution exists.
> >
> I'm using GLPK with the third party library pulp. Does it means that my
> third party library should scan the stdout in addition to the solution
> file in order to determine the true status of the solution?
>
No way. This is a glpk bug; it will be fixed in a next release.