Richness should look like this: <http://r.789695.n4.nabble.com/file/n4644004/trait_richness.jpg> -- View this message in context: http://r.789695.n4.nabble.com/Script-to-count-unique-values-from-two-linked-matricies-tp4643979p4644004.html Sent from the R help mailing list archive at Nabble.com.