How to get column index matrix of an array in R? -

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imagine have simple 4x3x2 array in r.

> x <- array(1:24,c(4,3,2), dimnames=list(c('a','b','c','d'),c('x','y','z'),1:2)) >  x , , 1    x y  z 1 5  9 b 2 6 10 c 3 7 11 d 4 8 12  , , 2     x  y  z 13 17 21 b 14 18 22 c 15 19 23 d 16 20 24

what i'd like, simple function on array gives me name of index of each element arbitrary dimension. in case, dimension 2.

the function behave this:

> arraydims(x,2)  #where 2 dimension want names for.  , , 1       [,1] [,2] [,3] [1,] "x"  "y"  "z"  [2,] "x"  "y"  "z"  [3,] "x"  "y"  "z"  [4,] "x"  "y"  "z"   , , 2       [,1] [,2] [,3] [1,] "x"  "y"  "z"  [2,] "x"  "y"  "z"  [3,] "x"  "y"  "z"  [4,] "x"  "y"  "z"

the function 

colmtx <- function(x, n) {  return( array(                     rep(dimnames(x)[[n]], each=prod(dim(x)[0:(n-1)])),                     dim=dim(x) ) ) }

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