We are now in the PCA journey, station 2.
Like the picture above, we want to know the difference between x and y. There are two ways for us to inspect, distance between x and y, and the angle between x and y. When it comes to the distance, the formula is as below:
We firstly make x - y, and then have the transpose of (x-y) time (x-y), and then have it be a root square value.
import numpy as np x = np.array([1, 2]) y = np.array([2, 1]) def distance(x, y): distance = ((x-y)@(x-y))**0.5 return distance distance(x, y)