sapply(estr, FUN=function(x) parse(text=x)) and it does print the greek letter in the xlab.
xyplot(1:10 ~ 1:10, scales = list(x = list(at = c(3, 6), labels = sapply(estr, FUN=function(x) parse(text=x))))) Rich ______________________________________________ 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.