r-help forum
I'm trying to calculate the diff between two rows and them mutate the difference into a new column. I'm using the diff function but not giving me what I want. df <- data.frame(ID=1:5,Score=4*2:6) What a want where ID Score diff 1 1 8 8 2 2 12 4 3 3 16 4 4 4 20 4 5 5 24 4 What I am getting ID Score diff 1 1 8 NA 2 2 12 4 3 3 16 4 4 4 20 4 5 5 24 4 Jeff [[alternative HTML version deleted]] ______________________________________________ R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.