matrix - R getting mean for every nth row -


is there more elegant way of getting mean current prior nth row? example, 

x=replicate(3, rnorm(20))

what want mean of column 2 each row + 2 rows prior. way 1) create empty column 2) loop through each row , values prior 2 rows, mean it, store in new column. it's tedious i'm wondering if there cleaner, faster method? in advance. ahdee

try filter - doing rolling mean.

filter(x[,2], rep(1/3,3), sides=1)

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