Hello,
This is my first post to R-help so forgive me if I'm committing a fatal error somehow.  Feel free to let me know.
 
My question is this:  I would like to add a triangle to represent the mean in a box plot generated with the bwplot command.   How do I do this?  I am able to do this using the boxplot and points command but points does not work with bwplot.    If you run the following code in R, you'll see that I'm trying to reproduce graphs from method 2 by modifying code from method 1.
 
Thank you,
Surai Jones
 
 
library(lattice)
attach(barley)
 
#method 1
bwplot(yield~year, pch="|") 
 
#method 2
boxplot(yield~year)
mean.values<-tapply(yield,year, mean)
points(1:2, mean.values, pch = 17)


      
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