How to join two sequences in matlab?

I have a two sequences x1=[5 5 1 5 4 1 2 3 5 5 1 5], x2=[3 9 7 6 6 10 12 15 15 15 13], how to join these two to form a one sequence like this x=[5 5 1 5 4 1 2 3 5 5 1 5 3 9 7 6 6 10 12 15 15 15 13].

Answer 1

[James Tursa]

x = [x1 x2];