Dear R-users,
I would like to apply a function (more precisely sd()) over the third dimension
of a three-dimension array. The function apply would be interesting but the
chosen function can only be applied on the rows and columns of the array
according to the help file. I can use a loop to cut the array in matrices and
then use apply for each replication, but it's not very nice. A small example:
a <- array(runif(1200),c(3,4,100))
b <- matrix(NA,3,4)
for(j in 1:3){ b[j,] <- apply(a[j,,],1,sd) }
Is there someting better than the use of a loop ?
Thanks
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