[Couenne] how to setup acceptable gap limit

[Pietro Belotti]

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.

Best,
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:

> hi everybody,
>
> what option should i use to tell couenne to stop when the gap between lower
> and upper bound is say <= 5%?
>
> the options "acceptable_tol" and "tol" dont seem to be the right ones for my
> purpose. is that correct? do i need something like Cbc.<some-option>?
>
> thanks.
> --
> regards
> Ashutosh Mahajan
> http://coral.ie.lehigh.edu/~asm4
>
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> Couenne mailing list
> Couenne at list.coin-or.org
> http://list.coin-or.org/mailman/listinfo/couenne
>



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