<div dir="ltr"><div><div>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.<br><br></div>Regards,<br></div>Pietro<br></div><div class="gmail_extra"><br><div class="gmail_quote">On Tue, Nov 21, 2017 at 5:23 PM, Luca Mencarelli <span dir="ltr"><<a href="mailto:mencarelli@lix.polytechnique.fr" target="_blank">mencarelli@lix.polytechnique.fr</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">The complete output is:<br>
<br>
Cbc0001I Search completed - best objective 1e+50, took 83376 iterations<br>
and 1970 nodes (41.36 seconds)<br>
Cbc0035I Maximum depth 40, 0 variables fixed on reduced cost<br>
<br>
"Finished"<br>
<br>
Linearization cuts added at root node: 1450<br>
Linearization cuts added in total: 1450 (separation time:<br>
0.005999s)<br>
Total solve time: 41.3867s (41.3867s in<br>
branch-and-bound)<br>
Lower bound: -1.05893<br>
Upper bound: -1.05893 (gap: 0.00%)<br>
Branch-and-bound nodes: 1970<br>
Performance of FBBT: 1.82973s, 1744<br>
runs. fix: 4.87378 shrnk: 59.0572 ubd: 0 2ubd: 0<br>
infeas: 445<br>
<br>
Thanks again,<br>
<div><div class="h5">Luca<br>
--<br>
"Nothing at all takes place in the universe in which some rule of maximum<br>
or minimum does not appear." Leonhard Euler (1707-1783)<br>
------------------------------<wbr>---------------------------<br>
Luca Mencarelli<br>
PhD Candidate at LIX (UMR 7161), Ecole Polytechnique<br>
91128 Palaiseau CEDEX, France<br>
Office: 2072 (Bâtiment Alan Turing, second floor)<br>
E-mail address: <a href="mailto:mencarelli@lix.polytechnique.fr">mencarelli@lix.polytechnique.<wbr>fr</a><br>
Twitter: @l_mencarelli<br>
<br>
> Dear all,<br>
><br>
> I am running several tests with Couenne and I have the following problem.<br>
> For several instances Couenne finds "best objective 1e+50" (unbounded<br>
> problems), but for those instances I have a feasible point. I tried to<br>
> disable the aggressive bound tightening options, but the problem remains<br>
> unchanged. I would like to ask there are other options that, in this case,<br>
> I can consider or a different settings for Couenne parameter (I use the<br>
> default settings, a part from the exception I've already discussed).<br>
><br>
> Thanks in advance. Best regards,<br>
> Luca<br>
> --<br>
> "Nothing at all takes place in the universe in which some rule of maximum<br>
> or minimum does not appear." Leonhard Euler (1707-1783)<br>
> ------------------------------<wbr>---------------------------<br>
> Luca Mencarelli<br>
> PhD Candidate at LIX (UMR 7161), Ecole Polytechnique<br>
> 91128 Palaiseau CEDEX, France<br>
> Office: 2072 (Bâtiment Alan Turing, second floor)<br>
> E-mail address: <a href="mailto:mencarelli@lix.polytechnique.fr">mencarelli@lix.polytechnique.<wbr>fr</a><br>
> Twitter: @l_mencarelli<br>
><br>
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