> PS: Any speed suggestions are appreciated. This is "experimenting time" for > me.
You might want to check out the plyr package - it incorporates everything I know about making these sorts of operations fast. The next version will do even better. 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.