check if the entries of an array exists in another array

I've got two arrays,

a1 = ["a", "b", "c", "d", "e", "f"]
a2 = ["c", "f"]

I would like to check if a2 is present in a1. For a dingle entry, I could use find. I'm not sure how to check for all entries of "a2" at once

Any suggestion on how to check?

Answer 1

[KSSV]

Read about ismember.

[c,ia] = ismember(a1,a2) ;
a1(c)