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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