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>        2. A single tree which returns multiple values
>
> For the second case, you'd need GPNodes which return not one but two numbers -- just modify the GPData to have two instance variables as appropriate.  This may or may not make sense for your problem.

Just a suggestion -- this could be a job for Cartesian GP or similar
graph-based GP. The ECJ homepage has a link to an ECJ implementation
of Cartesian GP.

James


-- 
Dr. James McDermott
Natural Computing Research & Applications Group,
Complex and Adaptive Systems Laboratory,
University College Dublin, Ireland.
http://www.skynet.ie/~jmmcd