Method pickNode

Picks a node at random from tree and returns it. The tree is located in ind, which is located in s.population[subpopulation]. This method will be preceded with a call to reset(); afterwards, pickNode(...) may be called several times for the same tree.

(final EvolutionState s,
        final int subpopulation,
        final int thread,
        final GPIndividual ind,
        final GPTree tree)