[R] highlighting subset of point with xyplot (or Hmisc(xYplot))

Patrick Lorch plorch at email.unc.edu
Fri Jul 16 23:32:45 CEST 2004

Hello all,
	I am trying to use xyplot to give a six panel plot and to highlight 
only points (in any panel) that meet a certain criterion.  With the 
plot command I would do something like:
I had thought I could just stick in the pch line from above into either 
xyplot or xYplot with groups set to Site like:
This does not produce any highlighting (all symbols come out as open 
circles (19)).  I have not messed with writing my own panel functions, 
though I know that is where the solution must lie.  Hopefully someone 
has an example that is close enough to help me.  I can send an example 
plot to anyone that wants one.

Dr. Patrick D. Lorch

                 plorch at email.unc.edu
Department of Biology           W: 919-843-2320
University of North Carolina    F: 919-962-1625
   at Chapel Hill
CB#3280, Coker Hall
Chapel Hill, NC 27599-3280

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