how do i find common elements without using the following?

i need to find common elements in to arrays without using loops, intersect or ismember. any ideas?

[Guillaume]

The whole purpose of the assignment is for you to come up with the algorithm.

Answer 1

[Matt J]

As a hint, bsxfun() might be useful.

arrayfun() might also let you do this, but I'm not sure that it counts as "loop-free", since it is basically just a wrapper for a for-loop.