Dear Dr. Lemon, I am amazed, I did not know that a space could solve this issue. So you mean that, besides being sensible to letter capitalization, R is also sensible to spaces?
Many thanks! Jue [[alternative HTML version deleted]] ______________________________________________ R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see 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.