[Couenne] Lower/Upper bounds variables

[Pietro Belotti]

Hi Luca,

when Couenne stops before closing the gap, the best feasible MINLP
solution found (if any) is saved in a file with the same name as the
input file but with extension .sol (which is the format read by AMPL).
So the answer is yes for the upper bound if at least one solution is
found.

However, this does not make much sense for the lower bound, given that
it's obtained by a relaxation of the MINLP (and would hence be
infeasible) and is related to the whole branch-and-bound search tree
rather than a specific subproblem. Hence no solution is available for
the lower bound.

Hope this helps,
Pietro


On Mon, May 18, 2015 at 11:05 AM, Luca Mencarelli
<mencarelli at lix.polytechnique.fr> wrote:
> Hi,
>
> If Couenne did not succeed in solving a problem to optimality, it's
> possible to
> retrieve the values of the decision variables corresponding to the lower
> and to
> the upper bounds provided by the solver?
>
> Thanks. Best,
> Luca
>
> --
> Luca Mencarelli
> PhD Candidate at LIX, Ecole Polytechnique
> 91128 Palaiseau CEDEX, France
> Office: 2072 (Bâtiment Alan Turing, second floor)
> E-mail address: mencarelli at lix.polytechnique.fr
>
>
>
>
>
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