[Couenne] "best objective 1e+50"

[Pietro Belotti]

This is a common issue: Cbc doesn't trust Couenne's integer feasible
solution and reports 1e50. I can't instruct Cbc not to print that line. The
actual, returned solution and the lower/upper bounds are displayed in the
last few lines: you solved the problem to optimality with value -1.05893.

Regards,
Pietro

On Tue, Nov 21, 2017 at 5:23 PM, Luca Mencarelli <
mencarelli at lix.polytechnique.fr> wrote:

> The complete output is:
>
> Cbc0001I Search completed - best objective 1e+50, took 83376 iterations
> and 1970 nodes (41.36 seconds)
> Cbc0035I Maximum depth 40, 0 variables fixed on reduced cost
>
>         "Finished"
>
> Linearization cuts added at root node:       1450
> Linearization cuts added in total:           1450  (separation time:
> 0.005999s)
> Total solve time:                         41.3867s (41.3867s in
> branch-and-bound)
> Lower bound:                             -1.05893
> Upper bound:                             -1.05893  (gap: 0.00%)
> Branch-and-bound nodes:                      1970
> Performance of                           FBBT:      1.82973s,     1744
> runs. fix:    4.87378 shrnk:    59.0572 ubd:          0 2ubd:          0
> infeas:        445
>
> Thanks again,
> Luca
> --
> "Nothing at all takes place in the universe in which some rule of maximum
> or minimum does not appear." Leonhard Euler (1707-1783)
> ---------------------------------------------------------
> Luca Mencarelli
> PhD Candidate at LIX (UMR 7161), Ecole Polytechnique
> 91128 Palaiseau CEDEX, France
> Office: 2072 (Bâtiment Alan Turing, second floor)
> E-mail address: mencarelli at lix.polytechnique.fr
> Twitter: @l_mencarelli
>
> > Dear all,
> >
> > I am running several tests with Couenne and I have the following problem.
> > For several instances Couenne finds "best objective 1e+50" (unbounded
> > problems), but for those instances I have a feasible point. I tried to
> > disable the aggressive bound tightening options, but the problem remains
> > unchanged. I would like to ask there are other options that, in this
> case,
> > I can consider or a different settings for Couenne parameter (I use the
> > default settings, a part from the exception I've already discussed).
> >
> > Thanks in advance. Best regards,
> > Luca
> > --
> > "Nothing at all takes place in the universe in which some rule of maximum
> > or minimum does not appear." Leonhard Euler (1707-1783)
> > ---------------------------------------------------------
> > Luca Mencarelli
> > PhD Candidate at LIX (UMR 7161), Ecole Polytechnique
> > 91128 Palaiseau CEDEX, France
> > Office: 2072 (Bâtiment Alan Turing, second floor)
> > E-mail address: mencarelli at lix.polytechnique.fr
> > Twitter: @l_mencarelli
> >
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