HI, Not sure if this works for you. set.seed(5) dat<-data.frame(x=sample(1:20,6,replace=TRUE),a=sample(20:40,6,replace=TRUE)) dat1<-transform(dat,f=a/median(a),x_new=x*(a/median(a))) head(dat1,2) # x a f x_new #1 5 31 1.016393 5.081967 #2 14 36 1.180328 16.524590 A.K.
----- Original Message ----- From: meng <laomen...@163.com> To: r-help@r-project.org Cc: Sent: Monday, December 24, 2012 12:55 AM Subject: [R] How to do it through 1 step? A data set(dat),has 2 variables: x and a, and 100 rows. I wanna add 2 variables,and call the new data set dat1: var1:f = a/median(a) var2:x_new = x*f My solution: dat1<-transform(dat,f = a/median(a),x_new = x*f) But gets error reply which says that "f" is not exits since dat has no variables called "f". So I have to do through 2 steps: dat0<-transform(dat,f=a/median(a)) dat1<-transform(dat0,x_new=x*f) How to do it through 1 step? Many thanks! [[alternative HTML version deleted]] ______________________________________________ R-help@r-project.org mailing list 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. ______________________________________________ R-help@r-project.org mailing list 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.
