Up down counter in command line

Is there a simple way to create an up down counter in command line or simple script/function?

Specifically, how can we create vectors such as [...1 2 3 3 2 1 1 2 3...], and more generally for any integers instead of 1 and 3?

Answer 1

[darova]

Example

n = 3;
sample = [1:n flip(1:n)];
vector = repmat(sample,[1 3]);