[Cbc] Fwd: CBC

[Giacomo Nannicini]

Hi,
I never used the Matlab interface, but looking at the output, it seems
that the LP relaxation of the problem is infeasible (look at the sum
of infeasibilities).
"Successful termination" probably just means that there was no error,
but the problem has no feasible solution anyway. If you think that
there must be a feasible solution, I'd suggest checking your data.

Giacomo

On Tue, Feb 18, 2014 at 9:56 AM, Petros Karasakalidis
<petkaras at gmail.com> wrote:
> Hi all,
>
> I am forwarding this email here as I m not sure my previous email went
> through since I cannot see it on the active tickets. Any help would be
> greatly appreciated.
>
> Thanks
>
> ---------- Forwarded message ----------
> From: Petros Karasakalidis <petkaras at gmail.com>
> Date: Sat, Feb 15, 2014 at 8:21 PM
> Subject: CBC
> To: cbc-tickets at list.coin-or.org
>
>
> I use CBC through the opti toolbox (having Matlab as an interface) in order
> to solve a MILP problem. Everything was working until the point I used as
> inputs the data I have here
>
> https://www.dropbox.com/s/qwg4x50bcrhq066/cbc_inputs.xlsx
>
>
> The file is about 20MB and wouldnt fit into this email. For some reason, the
> objective results into a very large number (like 1e+50) while the status
> output shows success as follows:
>
> ------------------------------------------------------------------
>  This is CBC v2.8.8
>  Author: John J. Forrest
>
>  Problem Properties:
>  # Decision Variables:   2730 [0 Integer, 945 Binary]
>  # Linear Constraints:   2830 [13013 nz]
> ------------------------------------------------------------------
> Pass   1: suminf.    0.81917 (8) obj. -0.0499381 iterations 198
>
>  *** SUCCESSFUL TERMINATION ***
>  Objective Value: 1e+50
>  Gap:             1e+50 (100.00%)
>  Searched:        0 nodes [223 LP iterations]
> ------------------------------------------------------------------
>
> Would appreciate any feedback or direction towards the solution. Feel free
> to ask any questions that might be helpful.
>
> Thanks
>
>
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