[Couenne] Unknown operator error

[Pietro Belotti]

Dear Łucasz,

from the output the problem file seems to contain an AMPL operator
that is not recognized by Couenne. Do you use a defined function? In
that case, since Couenne requires all functions to be factorable
(unlike Ipopt and Bonmin), the problem cannot be solved by Couenne. If
not, it would be interesting to check that file if you can post it.

Regards,
Pietro

On Mon, Jun 22, 2015 at 12:13 PM, Łukasz Segiet <lukas.segiet at gmail.com> wrote:
> Dear All,
>
> I am trying to run Couenne on some .nl files and ipopt has no problems with
> them, but Couenne does. This is the output I get.
>
> bash-4.1$ ./couenne problem.nl
> Couenne 0.4.8 --  an Open-Source solver for Mixed Integer Nonlinear
> Optimization
> Mailing list: couenne at list.coin-or.org
> Instructions: http://www.coin-or.org/Couenne
>
> ERROR: unknown operator (address 0p7f25acb37830), aborting.
>
> Does anyone know what can be the issue and if there are some limitations on
> what Couenne can solve (and what is already solvable by ipopt)?
>
> Sincerely yours,
>
> Lukasz Segiet
>
>
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