4 messages · Gábor Csárdi, Julian Burgos, yoooooo
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!
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cumsum( mapply(function(i,j) sum(a$data[i:j]), x, y) ) Is this what you want? Gabor
Hi all, i have the following.. a <- data.frame(data = seq(1,10)) i have indices: x <- c(1, 5, 3, 9) y <- c(2, 7, 4, 10) I want the cumsum of a[1:2], a[5:7], a[3:4]... is there an elegant way to do it without any loop? Thanks! -- View this message in context: http://www.nabble.com/cumsum-list..-tp16025202p16025202.html Sent from the R help mailing list archive at Nabble.com.
______________________________________________ R-help at r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Csardi Gabor <csardi at rmki.kfki.hu> UNIL DGM
In this case you can simply do cumsum(a[x,]+a[y,]) Julian
Hi all, i have the following.. a <- data.frame(data = seq(1,10)) i have indices: x <- c(1, 5, 3, 9) y <- c(2, 7, 4, 10) I want the cumsum of a[1:2], a[5:7], a[3:4]... is there an elegant way to do it without any loop? Thanks!
Yes! mapply is awesome! Thanks.
cumsum( mapply(function(i,j) sum(a$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 at 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 <csardi at rmki.kfki.hu> UNIL DGM
______________________________________________ R-help at 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.
View this message in context: http://www.nabble.com/cumsum-list..-tp16025202p16049054.html Sent from the R help mailing list archive at Nabble.com.