Thanks Jeff, and OK I'll move next questions on the topic to the devel list :)
I was hoping there were packages that already dealt with this sort of things, that's why I posted my question here in the first place.. Thanks a lot for helping me with this, Cheers, Luca [[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.