[Scip] unresolved numerical troubles in LP

[Luca Mencarelli]

Thanks very much, Timo. Yes, there are no further errors.
I'm just doing several preliminary numerical tests to see
how difficult is solving a given model. I should definitely
improve the mathematical model.

Thanks again. Ciao,
Luca

-- 
"A mathematician is a machine for turning coffee into theorems."
Alfréd Rényi (erroneously attributed to Paul Erdős)
---------------------------------------------------------
Luca Mencarelli
PhD Candidate at LIX, Ecole Polytechnique
91128 Palaiseau CEDEX, France
Office: 2072 (Bâtiment Alan Turing, second floor)
LIX e-mail address: mencarelli at lix.polytechnique.fr
INRIA e-mail address:  luca.mencarelli at inria.fr



> Hi Luca,
>
> this warning can be seen frequently in numerically challenging problems
> (as LP relaxations of nonconvex MINLPs often tend to be) and does not
> necessarily indicate a problem. It basically means that the LP relaxation
> at that node could not be solved to proven optimality (within required
> tolerances) and SCIP thus has to continue without further cutting (at that
> node) and by branching without LP information. The hope is that the
> troubles get resolved in subsequent nodes. This may lead to bigger search
> trees but not to wrong results.
>
> If this warning comes without further errors or unintended behavior (like
> the solver hanging after this warning), you can ignore it (or improve the
> conditioning of your model, if possible).
>
> Hope that helps.
>
> Kind regards,
> Timo
>
>> Dear Scip community,
>>
>> I'm solving a nonconvex minlp, using Scip through ampl and at some point
>> I've have the following problem:
>>
>> (node 4710) unresolved numerical troubles in LP 15734
>>
>> Best,
>> Luca
>>
>> --
>> "A mathematician is a machine for turning coffee into theorems."
>> Alfréd Rényi (erroneously attributed to Paul Erd?s)
>> ---------------------------------------------------------
>> Luca Mencarelli
>> PhD Candidate at LIX, Ecole Polytechnique
>> 91128 Palaiseau CEDEX, France
>> Office: 2072 (Bâtiment Alan Turing, second floor)
>> LIX e-mail address: mencarelli at lix.polytechnique.fr
>> INRIA e-mail address:  luca.mencarelli at inria.fr
>>
>>
>>
>>
>>
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>
>
>