"... I suppose the clean way to do this would be to define a cartesian product of two factors with the induced lexicographic order (is there a standard function for doing this?):"
Of course. ?interaction. -- Bert Gunter Genentch ______________________________________________ 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.
