killing agents

[Peter Aykroyd]

Hi all,
   I'm having a problem with my swarm simulation killing agents.  They're
displayed on an extension of the grid2d and they are kept in a swarm list
object.  When they die, I've tried using the remove method on the list to
get them out and removing them from grid2d.  I've also tried, in addition
to these two measures, returning null from the method instead of the agent
object.  Nevertheless, whenever one dies it crashes the program due to a
null pointer exception.  Can anyone tell me what I'm not doing?  Thanks for
any help you can give.



        Pete
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