cumsum( mapply(function(i,j) sum(a$data[i:j]), x, y) ) Is this what you want? Gabor
On Thu, Mar 13, 2008 at 06:02:13AM -0700, yoooooo wrote: > > Hi all, i have the following.. > > a <- data.frame(data = seq(1,10)) > > i have indices: > x <- c(1, 5, 3, 9) > y <- c(2, 7, 4, 10) > > I want the cumsum of a[1:2], a[5:7], a[3:4]... > > is there an elegant way to do it without any loop? Thanks! > > -- > View this message in context: > http://www.nabble.com/cumsum-list..-tp16025202p16025202.html > Sent from the R help mailing list archive at Nabble.com. > > ______________________________________________ > 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. -- Csardi Gabor <[EMAIL PROTECTED]> UNIL DGM ______________________________________________ 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.
