On 23/03/2010, at 2:02 PM, Gundala Viswanath wrote:
> Hi all,
>
> I have a frequency data that looks like this.
>
> 3
> 2
> 1
> 5
>
> What I want to get is the "decreasing" cumulative of this data
> yielding
>
> 11
> 8
> 6
> 5
> 0
>
> Is there any?
>
> I am aware of cumsum(), which will yield
> 3
> 5
> 6
> 11.
>
> But it is not what I want.
rev(cumsum(rev(c(x,0))))
[1] 11 8 6 5 0
?rev
cheers,
Rolf Turner
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