[R] Placing legends

[Doug Bourne]

I'm trying to automate making a bunch of figures and I need a way to 
automate legend position.  As I understand it the legend is placed based 
on coordinates.  I don't know before hand what the coordinates are going 
to be.  On one graph my y axis might go from -50 to -10.  On another it 
might go from 0 to 180.

Is there any way to query where the origin is?  Or is there another way 
to place the legend?

Thanks,
Doug Bourne
Graduate Student
University of British Columbia