search for: tp4451211p4451211

...in this case, length() of the y argument is 2, which yes, is not the number of rows in the data frame. I'm not sure that it is mapply, rather than lapply that I want Thanks, Jon -- View this message in context: http://r.789695.n4.nabble.com/How-to-apply-two-parameter-function-in-data-frame-tp4451211p4451211.html Sent from the R help mailing list archive at Nabble.com.