Hi RUI Thank you so much ! I know I have a lot to learn : / sorry for that. If I want to make a new data.frame where it is the NONEURO avgflows. how do I do that ? Ph -- View this message in context: http://r.789695.n4.nabble.com/Assignment-problems-tp4578672p4581164.html Sent from the R help mailing list archive at Nabble.com.