hi all, I want to get a cumsum according to the order of some variable. However, it doesnt' work. For example, ********************** test<-data.frame(cbind(x=c(3,5,2,6,7),y=c(8,1,4,9,0))) test[order(test$x),]$sumy<-cumsum(test[order(test$x),]$y) ********************** R complians Warning message: In `[<-.data.frame`(`*tmp*`, order(test$x), , value = list(x = c(2, : provided 3 variables to replace 2 variables.
while the following *********************** test$sumy<-cumsum(test[order(test$x),]$y) ****************** gives x y sumy 1 3 8 4 2 5 1 12 3 2 4 13 4 6 9 22 5 7 0 22 should it gives x y sumy 1 3 8 12 2 5 1 13 3 2 4 4 4 6 9 22 5 7 0 22 What am I missing here? thanks, Guang ______________________________________________ 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.
