[Bonmin] Infeasibility

[Pierre Bonami]

Hi Kanika,
The behavior you describe is very strange. Did you also change your  
Bonmin?
Do you use the solution of CPLEX to setup the problem given to Bonmin?

Regards,
Pierre
On Jul 17, 2008, at 5:12 PM, Kanika Dhyani wrote:

> Hi Claudia,
>
> The thing is that I have some subproblems and which are LPs and  
> MINLP for
> which I alternate between CPLEX and BONMIN. I am using BB-B for these
> problems. It is strange as to why I would get these infeasibility  
> errors due
> to upgrade of CPLEX, but that is the only thing that has changed.
>
> Regards,
> Kanika
>
> -----Original Message-----
> From: Claudia D'Ambrosio [mailto:c.dambrosio at unibo.it]
> Sent: giovedì 17 luglio 2008 15.50
> To: bonmin at list.coin-or.org
> Cc: Kanika Dhyani
> Subject: Re: [Bonmin] Infeasibility
>
> Hi Kanika,
> which Bonmin algorithm are you using?
> For non convex MINLPs I use B-BB and in this case, to my knowledge,  
> Cplex is
>
> not involved in the run (it is just used in B-OA and B-Hyb  
> algorithms as
> MILP
> subsolver).
> If you do not use B-BB for non-convex problem, some Outer  
> Approximations
> cuts
> might cut off (part of) your feasible region.
> Regards,
> Claudia
>
>
>
>
> On Wednesday 16 July 2008 04:56:23 pm Kanika Dhyani wrote:
>> Hi,
>>
>> I am tackling a mixed integer nonlinear non convex program . My  
>> problems
>> started after the upgrade of the licenses on our server. I am  
>> using BONMIN
>> and CPLEX with AMPL in the same problem. We upgraded the CPLEX  
>> licenses to
>> 11. Following which all my codes which used BONMIN now tell me  
>> that the
>> problem is infeasible and dont work now. Earlier they all worked  
>> perfectly
>> fine.
>>
>> Playing with some settings I get either Infeasible Problem or Ipopt
> exceeds
>> maximum number of iterations or problem too expensive. Please advice.
>>
>> Thank you
>> Kanika
>
>
>
> _______________________________________________
> Bonmin mailing list
> Bonmin at list.coin-or.org
> http://list.coin-or.org/mailman/listinfo/bonmin