How can I get an array of alternating values in python?

Question

Simple question here:

I\'m trying to get an array that alternates values (1, -1, 1, -1.....) for a given length. np.repeat just gives me (1, 1, 1, 1,-1, -1,-1, -1

Answer 1

I'll just throw these out there because they could be more useful in some circumstances.

If you just want to alternate between positive and negative:

[(-1)**i for i in range(n)]

or for a more general solution

nums = [1, -1, 2]
[nums[i % len(nums)] for i in range(n)]