Hi Michael and David, Thank you both for your reply to my question. Problem solved. I'm finding that my level of success with R is a little uneven thus far. I'm sometimes surprised by the things I can do, but then am even more surprised by the simple things I struggle with.
Appreciate your help. Paul ______________________________________________ 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.
