[Couenne] how to setup acceptable gap limit

[Pietro Belotti]

Hi Ashu,

I think they are CBC options. It would be better to refer users to the  
documentation for Cbc (and Bonmin, Ipopt, etc.) as well.

Cheers,
Pietro


_________________________________________
Pietro Belotti, Lehigh University
Dept. of Industrial & Systems Engineering
200 W Packer Ave, Bethlehem PA 18015.
phone: 610-758-3865   fax: 610-758-4886
email: belotti at lehigh.edu
web:   http://www.lehigh.edu/~pib208


On 11/13/2009, Ashutosh Mahajan <asm4 at Lehigh.EDU> wrote:

> On Fri, 13 Nov 2009, Pietro Belotti wrote:
>
>> Hi Ashu,
>>
>> I believe the two options allowable_gap and allowable_fraction_gap are
>> what you are looking for. With the option
>>
>> allowable_gap 2.58
>>
>> Couenne stops as soon as |lower-upper| < 2.58, while the option
>>
>> allowable_fraction_gap 0.05
>>
>> makes Couenne stop as soon as the relative gap falls below 5% (I guess
>> they are equivalent to absmipgap and relmipgap in Cplex, respectively).
>>
>> Hope this helps.
>
> Thanks Pietro, both options work perfectly well. They however dont appear in
> the output when i do couenne -=. I see bonmin.allowable_gap and
> bonmin.allowable_fraction_gap in the output and they also seem to have the
> same effect. Im using stable-0.2.
>
> --
> regards
> Ashutosh Mahajan
> http://coral.ie.lehigh.edu/~asm4
>
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>



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