Sum every nth points

Question

I have a vector and I need to sum every n numbers and return the results. This is the way I plan on doing it currently. Any better way to do this?

Answer 1

UPDATE:

If you want to sum every n consecutive numbers use colSums
If you want to sum every nth number use rowSums

as per Josh's comment, this will only work if n divides length(v) nicely.

rowSums(matrix(v, nrow=n))
 [1] 460 470 480 490 500 510 520 530 540 550

colSums(matrix(v, nrow=n))
 [1]  55 155 255 355 455 555 655 755 855 955

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