On Jun 23, 2004, at 2:07 PM, Eduardo Zuviria wrote: > I've just started using ECJ and I have to write a genetic programming > system with two different types. I would like to know if somebody has > an > example of how to define several types in the parameter file? Eduardo, I myself do not have a demo for using typing because when I've used it in the past my experiments were large and complex and it'd not be much help. Recently, however, I put together a small example for someone who needed various functions to send or receive data of two types ("pn" and "nonpn"). There was no need for set typing: they were all atomic. Perhaps it might be useful for you to peruse however.