[R] blockwise sums

Gabor Grothendieck ggrothendieck at myway.com
Tue Aug 31 15:13:57 CEST 2004

Lutz Prechelt <prechelt <at> pcpool.mi.fu-berlin.de> writes:

: I am looking for a function like 
:   my.blockwisesum(vector, n)
: that computes sums of disjoint subsequences of length n from vector
: and can work with vector lengths that are not a multiple of n.
: It should give me for instance
:   my.blockwisesum(1:10, 3) == c(6, 15, 24, 10)

tapply(v, (seq(v)-1)%/%n, sum)

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