Finding common elements in two arrays of different size

Question

I have a problem to find common elements in two arrays and that\'s of different size.

Take , Array A1 of size n and Array A2 o

Answer 1

In APL:

∪A1∩A2

example:

      A1←9, 4, 6, 2, 10, 10
      A1
9 4 6 2 10 10

      A2←14, 3, 6, 9, 10, 15, 17, 9
      A2
14 3 6 9 10 15 17 9

      A1∩A2
9 6 10 10
      ∪A1∩A2
9 6 10