The key thing is the function bquote(). E.g.
> N <- 5 > xxx <- bquote(bold("Figure"~.(N)~"Plot"~C[max]~"versus CrCl")) > plot(1:10,main=xxx) (Not sure about the ``bold'' business, but R doesn't object.) Or to take a simpler and clearer example: > N <- 5 > plot(1:10,main=bquote("Figure"~.(N)) cheers, Rolf Turner [EMAIL PROTECTED] ______________________________________________ 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.