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# 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_04.py

import numpy as np

k = 2
X = [[1,2],
     [3,4]]

# scalar multiplication
k_times_X = np.dot(k,X)
k_times_X_2 = k*np.matrix(X)