R: Average by every N value in 3-dim matrix -


i have matrix hourly data (on monthly period) , dim [116 152 744] trying create matrix b daily data , dim [116 152 31] every dim tstep in b average of first 24 tsteps in matrix a.

i successful in creating matrix c monthly data simple apply 

c <- apply(a, c(1,2), function (x) mean(x))

but can't quite figure out average on every n values. thanks.

take 1 vector only, mean every 24 values, can do:

mean24 <- function(x) {   dim(x) <- c(24, length(x) / 24)   colmeans(x) }  x <- 1:48 mean24(x) [1] 12.5 36.5

so, in case, have do: 

apply(a, c(1, 2), mean24)

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