Re: [R] cumsum list..

From: Gabor Csardi <csardi_at_rmki.kfki.hu>
Date: Thu, 13 Mar 2008 14:09:57 +0100

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!
>
> --
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> Sent from the R help mailing list archive at Nabble.com.
>
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-- 
Csardi Gabor <csardi_at_rmki.kfki.hu>    UNIL DGM

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Received on Thu 13 Mar 2008 - 13:14:35 GMT

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