If I understand what you're asking this is one (although probably not the easiest or best) way:
X <- as.data.frame(matrix(runif(50), nrow=10)) X.tmp <- rbind(rep(NA, dim(X)[2]), X[1:(dim(X)[1]-1),]) X.new <- X - X.tmp -Ista On Sun, Oct 25, 2009 at 5:45 PM, Marsha Melnyk <mmel...@stevens.edu> wrote: > I don't know if there is a way to do this in R but I want to subtract > within the same column from different rows. I want to subtract > c(r)-c(r-1) and continue down the column until they are all calculated > and form another column. Again I don't know if R can do this but I > thought I would ask. > > Thanks either way > > ______________________________________________ > 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. > -- Ista Zahn Graduate student University of Rochester Department of Clinical and Social Psychology http://yourpsyche.org ______________________________________________ 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.
