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Or you can simply discard any non-conformed individuals, during any process
(initialization, breeding). And keep generating new individuals until your
population is filled with the individuals conforming to this rule.


On Mon, Feb 24, 2014 at 1:13 PM, Sean Luke <[log in to unmask]> wrote:

> Francisco, ECJ can't do this by default: and I really have no idea how to
> require this constraint.  You'll have to either enforce this rule in the
> tree builder algorithm and/or the crossover mutation operators.
>  Alternatively you can assess the fitness of non-confirming individuals as
> very low.
>
> Sean
>
> On Feb 24, 2014, at 6:57 AM, Francisco Lopez de la Franca <
> [log in to unmask]> wrote:
>
> > Hello.
> >
> > I am new in ECJ. I'm going to use ECJ to find the solution of a second
> degree equation, that is, x=(-b+sqrt(b^2-4ac))/(2a).
> > I've implemented as FunctionSet the following nodes: add, sub, sqrt,
> square, mul, div, neg, a, b, c, 2 and 4.
> > I've followed the instructions described both in the tutorial4 in the
> documentations provided with ECJ and the one in the ECJ manual.
> >
> > What I need and donot find the way, is to force to appear in the result
> tree the nodes: a, b, c, 2, 4, -, +, sqrt, square, div and mul. That is, to
> specify in some manner that the nodes must appear at least once. Moreover,
> I'd like to know if it is possible to set that one node must appear a
> number of times in the solution.
> >
> > I hope to have explained well.
> >
> > Thank you very much in advance.
> >
> > Regards.
>