[Couenne] About the value of the solve_result_num AMPL variable

[Pietro Belotti]

Marco,

this is probably a question you want to ask in some AMPL mailing list, as 
you'll get answers from more qualified people on the subject. This said, 
if Couenne says an optimal solution was found, by and large you can ignore 
the output from AMPL in that sense.

Pietro

--
Pietro Belotti
Dept. of Mathematical Sciences
Clemson University
email: pbelott at clemson.edu
phone: 864-656-6765
web:   myweb.clemson.edu/~pbelott

On Mon, 12 Sep 2011, sguazt wrote:

> Hi,
>
> Can I safely ignore the precise value of solve_result_num variable and
> simply check for the range it belongs to?
>
> I mean, AMPL defines the following ranges:
>
> 0 - 99 --> optimal solution found
> 100 - 199 --> optimal solution indicated, but error likely
> 200 - 299 --> constraints cannot be satisfied
> 300 - 399 --> objective can be improved without limit
> 400 - 499 --> stopped by a limit that you set (such as on iterations)
> 500 - 599 --> stopped by an error condition in the solver
>
> So, inside each range is any value assumed by solve_result_num equivalent?
>
> I ask for this since I just get for solve_result_num a value of 3. So
> I would tend to consider "3" == "0".
>
>
> Thank you very much.
>
> Best,
>
> -- Marco
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