###############
# Authored by Weisheng Jiang
# Book 4  |  From Basic Arithmetic to Machine Learning
# Published and copyrighted by Tsinghua University Press
# Beijing, China, 2022
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# Bk4_Ch4_06.py

import numpy as np

A = np.array([[1, 2],
              [3, 4]])

B = np.array([[2, 4],
              [1, 3]])

# matrix multiplication
A_times_B = np.matmul(A, B)
A_times_B_2 = A@B