python: check if an numpy array contains any element of another array

Question

What is the best way to check if an numpy array contains any element of another array?

example:

array1 = [10,5,4,13,10,1,1,22,7,3,15,9]
array2 = [3,4,9,1         


        

Answer 1

You can try this

>>> array1 = [10,5,4,13,10,1,1,22,7,3,15,9]
>>> array2 = [3,4,9,10,13,15,16,18,19,20,21,22,23]
>>> set(array1) & set(array2)
set([3, 4, 9, 10, 13, 15, 22])

If you get result means there are common elements in both array.

If result is empty means no common elements.