For example, given the arrays [1,2] and [1,2,3,4], produce this array: [2,3,4,5,3,4,5,6].
In Python, this would look like this:
a = [1,2] b = [1,2,3,4] c =  for x in a: for y in b: c.append( x + y ) print c # [2, 3, 4, 5, 3, 4, 5, 6]
In ICE, one way to do this would be to add
Here’s an ICE tree that does just that:
This ICE tree uses the modulo trick, and the scalar-to-integer truncation trick.
You can see a variation of this in this Softimage mailing list post..