newDF<-as.data.frame(scale(oldDF)) see ?scale
Hope that helps. Michael Conklin -----Original Message----- From: r-help-boun...@r-project.org [mailto:r-help-boun...@r-project.org] On Behalf Of Karin Lagesen Sent: Thursday, April 16, 2009 5:29 AM To: r-help@r-project.org Subject: Re: [R] performing function on data frame David Hajage <dhajag...@gmail.com> writes: > Hi Karin, > > I'm not sure I understand... Is this what you want ? > > d$y - mean(d$y)/sd(d$y) Yes, and also a bit no. Each column in my data frame represents one data set. For every element in this data set I want to know the z value for that element. I.e: I want to create a new data frame from the old data frame, where each element in the new data frame is newDF[i,j] = oldDF[i,j] - mean(d[,j]) / sddev(d[,j]) I could, I think, iterate like this over the data frame, but I keep thinking that one of the apply functions should be employed... Karin -- Karin Lagesen, Ph.D. karin.lage...@medisin.uio.no http://folk.uio.no/karinlag ______________________________________________ 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.
