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

Use numpy.tile!

import numpy
a = numpy.tile([1,-1], 15)