Michael, I'd recently (in the last few months) made significant 

modifications to the ES package, simplifying it and making it more 

flexible.  I may have screwed something up, let me look.



BTW: thanks for the bug reports, they're enormously helpful.



Sean



Michael Hart wrote:

> Hi,

> 

> I just started running into issues with two breed threads and 

> ESSelection when mu+lambda are equal and not even (ie, mu = lambda = 

> 13). Basically the parent index was one higher than it should be and an 

> ArrayIndexOutOfBoundsException was being thrown.

> 

> I started digging around the code and I think ESSelection.java may 

> require a little TLC. Firstly, the produce(int, EvolutionState, int) 

> method seems to use a different way of calculating the parent than 

> either the breeder or the other produce method does. Secondly, I think 

> there's an off-by-one error in the way the current position is 

> determined when multiple threads are involved and lambda is not even.

> 

> I've attached a couple of patches that I think do the right thing (the 

> breeder patch is just a clean-up to clarify the code a little).

> 

> Cheers,

> 

> Michael