On 02/04/2013 6:36 AM, Enrico Bibbona wrote:
Is there any function that extends to multidimentional arrays the
functionalities of "row" and "col" which are just defined for matrices?
Thanks, Enrico Bibbona
Not as far as I know, but there are a lot of functions in packages.
You could write your own something like this. I've skipped any error
checking; you'll want to add that.
indices <- function(a, which) {
d <- dim(a)
prod_before <- prod(d[seq_len(which-1)])
result <- rep(seq_len(d[which]), each=prod_before, length.out = prod(d))
dim(result) <- d
result
}
Then indices(a, 1) gives an array of the same shape as a where entry i,
j, k, ... is i, indices(a, 2) has entry i,j,k, ... equal to j, etc.
Duncan Murdoch
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