Python Forum

import numpy as np

a = np.array([1, 2])
b = np.array([2, 1])

dot = 0

cosangle = a.dot(b) / (np.linalg.norm(a) * np.linalg.norm(b))
print(cosangle)

So I'm following a tutorial and the guy doesn't explain allot in terms of why this actually gives
the value of the cosine. Please Help.

This is the first formula in the Geometric Definition section in the wikipedia page about the dot product.