[R] sequential sum of a vector...

From: Shubha Vishwanath Karanth <shubhak_at_ambaresearch.com>
Date: Wed, 23 Jul 2008 19:33:30 +0530


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  

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