[R] Sum the cell of a vector

[Jonathan Daily]

?cumsum

On Tue, May 3, 2011 at 11:32 AM, Alaios <alaios at yahoo.com> wrote:
> Dear all,
> I would like to know what is the most time efficient way to calculate the following in a huge vector.
>
> Let's say that I have the vector
>
> 1,2,3,4,5,6
> and I want to return a vector of the same length which every cell containing the sum of the previous cells like this
>
> 1, 1+2, 1+2+3, 1+2+3+4, 1+2+3+4+5, 1+2+3+4+5+6
>
> What do you think is the most effective way to do that (not having to do the previous sum).
> Of course I can do this with a for loop but I believe that might be a more efficient way in R.
>
> I would like to thank you in advance for your help
>
> Best Regards
> Alex
>
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Jon Daily
Technician
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