> Another question: Can I add another line to the same plot with qplot? > (like function "lines" in "plot").
Yes. (if you want more details, tell us what you're trying to do!) Hadley -- http://had.co.nz/ ______________________________________________ R-help@r-project.org 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.