Creating a vector with duplicate points after point 1

Hello, thanks for reading this.

I want to create a vector which the first point is 1, and then each point after is a duplicate, as in:

1 2 2 3 3 4 4 5 5 etc

There is probably a easier way to do this than what I imagine; what would you recommend?

Thanks

Answer 1

[Andrei Bobrov]

variant

n=7;
out = [1 reshape(ones(2,1)*(2:n),1,[])]

variant 2

out = ones(1,2*n-1)
out(2:2:end) = 2:n
out(3:2:end) = 2:n

[Brian]

Thanks!