Finding indices when vectors is used

Assume we have x = [1,2,3,1]; If I execute idx = find(x == 1) then idx == [1,4]. Is there similar command for extracting more indices I am interested in, something like find(x == [1,3]) == [1,3,4].

Of course I would like to avoid loops.

-- Ok, but what if we allow repetitions? For instance: find(x == [1,3,1]) == [1,1,3,4,4] Can we do this without using loops?

Answer 1

[the cyclist]

I think you want the ismember() command.

[Mateusz]

Looks exactly what I am looking for, thanks :)

[Mateusz]

Ok, but what if we allow repetitions? For instance: find(x == [1,3,1]) == [1,1,3,4,4] Can we do this without using loops?