[R] List to Array: How to establish the dimension of the array

[Rui Barradas]

Hello,

If you just want the dimensions of the array, and assuming the input list
will give
a rectangular array with no need to use NA's, the function below works.
(It doesn't construct the array)

aa <- list(list(list(1:4),
                 list(5:8),
                 list(9:12)),
            list(list(13:16),
                 list(17:20),
                 list(21:24)))
bb <- list(aa, aa, aa, aa, aa)

fun <- function(lst){
	d <- ix <- 0
	while(length(lst) > 1){
		d[ix <- ix+1] <- length(lst)
		lst <- lst[[1]]
	}
	d[ix+1] <- length(lst[[1]])
	d
}

fun(aa)
fun(bb)

fun(list(aa, bb)) # not rectangular, therefore
fun(list(bb, aa)) # different results

Rui Barradas


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