http://r.789695.n4.nabble.com/file/n4632406/temp3880.csv temp3880.csv http://r.789695.n4.nabble.com/file/n4632406/weight3880.csv weight3880.csv Here are the files I promised to upload. -- View this message in context: http://r.789695.n4.nabble.com/rowSums-problem-tp4632405p4632406.html Sent from the R help mailing list archive at Nabble.com.