I'm sorry, I made a mistake in my example. you're right. I don't really know how a similarity alogrithm works....but I'm willing to try that...are there any good examples available? Thank you -- View this message in context: http://r.789695.n4.nabble.com/similarity-matrix-tp4157576p4159547.html Sent from the R help mailing list archive at Nabble.com.