
Hi,

I am working with the lattice package and I want to label to groups in the xyplots with mathematical expressions.
I short example for this

library(lattice)

Case<-factor(rep(1:2,each=300))
xx<-rnorm(600,0,1)
yy<-rnorm(600,0,1)
xyplot(yy~xx|Case)

This results in two scatter plots with label "1" and "2". I would like to substitute this labels by math expression. I used the following code

Case<-factor(rep(1:2,each=300))
levels(Case) <- c(expression(R^2),expression(sigma_[i]))
xx<-rnorm(600,0,1)
yy<-rnorm(600,0,1)
xyplot(yy~xx|Case)

But the label did not change to mathematical expressions. Any ideas?
Thank you very much for your help.

 		 	   		  
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