There are various ways, but for simple convenience that's exactly the job that crosstab() in ecodist was written for.
Sarah On Sat, Feb 7, 2009 at 2:47 PM, Drew Garey <coryda...@gmail.com> wrote: > Hello all, > > > > I have a *.csv file that looks like this (actual file is orders of magnitude > larger): > > > > Site taxa no.ind > > forest LMA 1 > > forest LCY 1 > > forest SCO 1 > > meadow LMA 2 > > meadow LCY 1 > > meadow PNT 3 > > > > I am interested in, but have failed to create, code that efficiently > converts it to a site-by-taxa matrix or data frame that looks like this: > > > > LMA LCY SCO PNT > > Forest 1 1 1 0 > > Meadow 2 1 0 3 > > > > > > With no repeating taxa names and zeros where a taxon is not listed for a > site. Any help would be greatly appreciated. > > > > Regards, > > > > Drew Garey > > Aquatic Ecoloy Lab Manager > > Virginia Commonwealth University > > [[alternative HTML version deleted]] > -- Sarah Goslee http://www.functionaldiversity.org ______________________________________________ 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.
