On Mar 3, 2014, at 7:14 AM, Francisco Lopez de la Franca <[log in to unmask]> wrote:

> I've used gp.koza.xover.likelihood to set the probability of performing the crossover operator and I've seen differences in my results, what it sounds good.
> After checking the koza.params file, I see that like for xover, there is a gp.koza.mutate param. I've tried with gp.koza.mutate.likelihood and when printing unaccessed params, the gp.koza.mutate.likelihood appears in that list.

GP has a different traditional pipeline: no mutation is used.  So setting likelihood won't have any effect, since mutation doesn't appear in the pipeline at all.

> Please, how do I set a probability for performing the mutation operator, I mean, with probability 0.x I want the mutation operation to be performed?

You will need to modify the GP pipeline to include mutation as appropriate.