[R] sequentially summing up a elements of a vector

[R. Michael Weylandt]

Perhaps I misunderstand you, but ?cumsum.

x <- c(0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 1, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, 0)
y <- c(0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 2, 2, 2, 2, 3, 3, 3, 3, 3, 4, 4, 4)
identical(cumsum(x), y)

Michael

On Sat, Jan 21, 2012 at 6:59 PM, Martin Batholdy
<batholdy at googlemail.com> wrote:
> Hi,
>
>
> I have a somewhat abstract and tricky problem (at least for me).
>
>
> Perhaps someone here can help me:
>
>
> I would like to convert:
>
> x <- c(0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 1, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, 0)
>
> into
>
> x <- c(0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 2, 2, 2, 2, 3, 3, 3, 3, 3, 4, 4, 4)
>
>
> every 1 in x marks kind of a 'border' which is separated in different 'regions' in the new x.
>
>
>
> thanks for any suggestions!
>
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