Node Column Expression with an array

Hi,

I have the following code in my node Column expression and it works pretty good. I tried the boxed loop with one row and 12 columns resulting because of the loop in 66 splitted columns.

My question is: How many rows or columns can

I use in this array because I cannot see the dimensions (rows and columns) of the array ??.

Source Code cited (see below):

var a = arrayCreate(0)
for (var j = 2; j <= 12; j++)
for (var i = j; i <= 12; i++)
a = arrayAdd(a, column(i) - column(j - 1))
arraySubset(a, 1, arrayLength(a))

Kind regards,

Ol