MATLAB: Removing non unique elements from an array after n entries

Question

If I have an array:

[1 2 3 4 5 6 8 1 2 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 .... 5]
                                   ^

How can I remove the remaining 5s after say, here?

Answer 1

out = yourVector(1:18);