How important it is to wrap the list in a return statement, ala return(list(ShrubCover.df, TreeCover.df, TotalCover.df))
or answer <- list(ShrubCover.df, TreeCover.df, TotalCover.df) return(answer) --- Completely Un. Consult the R Docs, especially the R Language Definition manual, for answers to this and your other numerous basic questions. That's what they're there for. -- Bert Gunter Genentech, Inc. ______________________________________________ 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.