R help - May 2011 - Sum the cell of a vector

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

?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
>
> ______________________________________________
> R-help at r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide
http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
>


-- 
==============================================Jon Daily
Technician
==============================================#!/usr/bin/env outside
# It's great, trust me.