Re: [R] cumsum list..

From: Julian Burgos <jmburgos_at_u.washington.edu>
Date: Thu, 13 Mar 2008 10:57:05 -0700

In this case you can simply do

cumsum(a[x,]+a[y,])

Julian

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!
>



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