On Fri, 23 Sep 2011, Michael Sumner wrote:
Do you perhaps mean ?droplevels, as mentioned in See Also of subset help?
Yep. Mis-translation between the help page and the working page. Mea culpa! Rich ______________________________________________ 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.