Unfortunately this does not work for lattice graphics. In such case I do something like the following, but I still do not know how to plot Greek letters in the panel titles:
theta <- 2.1 gr <- as.factor(c(1,2)) levels(gr)[1]<-"Group 1" levels(gr)[2]<-"Group 2" library(lattice) print(xyplot(1~1|gr, xlab=eval(substitute(expression(paste(theta, " = ", tval)), list(tval=theta))), ylab=eval(substitute(expression(paste(theta, " = ", tval)), list(tval=theta))), main=eval(substitute(expression(paste("Results for ",theta, " = ", tval)), list(tval=theta))), sub=eval(substitute(expression(paste(theta, " = ", tval)), list(tval=theta))) )) best, valentin ______________________________________________ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.