[R] panel function

From: Martin Henry H. Stevens <hstevens_at_muohio.edu>
Date: Wed 21 Dec 2005 - 05:30:21 EST

R v. 2.2.0 on Mac OS 10.4.3
lattice v. 0.12-11

I am trying to add a horizontal panel mean line to a series of panels in a trellis plot (i.e. a horizontal line at the mean of y for each individual panel). I have tried innumerable ways to do this, including the code below, but if it works at all, it merely puts a horizontal line in the last panel.

xyplot(diss ~ Nut-7|Size, data=dathdiss, pch=1, jitter.data=TRUE, panel=function(x,y,...){

	panel.abline(a=mean(y),b=0) #This results in the correct line in the  
last panel, but no other lines at all.

Any and all thoughts are appreciated.
Thank you kindly,

Dr. Martin Henry H. Stevens, Assistant Professor 338 Pearson Hall
Botany Department
Miami University
Oxford, OH 45056

Office: (513) 529-4206
Lab: (513) 529-4262
FAX: (513) 529-4243


"E Pluribus Unum"

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