Re: [R] sequential sum of a vector...

From: Henrique Dallazuanna <wwwhsd_at_gmail.com>
Date: Wed, 23 Jul 2008 12:47:45 -0300

Maybe:

tapply(x, gl(10, 8), sum)

or

unlist(lapply(split(x, gl(10, 8)), sum))

On Wed, Jul 23, 2008 at 11:03 AM, Shubha Vishwanath Karanth <shubhak_at_ambaresearch.com> wrote:
> Hi R,
>
>
>
> Let,
>
>
>
> x=1:80
>
>
>
> I want to sum up first 8 elements of x, then again next 8 elements of x,
> then again another 8 elements..... So, my new vector should look like:
>
> c(36,100,164,228,292,356,420,484,548,612)
>
>
>
> I used:
>
>
>
> aggregate(x,list(rep(1:10,each=8)),sum)[-1]
>
> or
>
> rowsum(x,group=rep(1:10,each=8))
>
>
>
>
>
> But without grouping, can I achieve the required? Any other ways of
> doing this?
>
>
>
> Thanks, Shubha
>
>
>
> This e-mail may contain confidential and/or privileged i...{{dropped:13}}
>
> ______________________________________________
> R-help_at_r-project.org mailing list
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> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
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>

-- 
Henrique Dallazuanna
Curitiba-Paraná-Brasil
25° 25' 40" S 49° 16' 22" O

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Received on Wed 23 Jul 2008 - 16:47:01 GMT

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