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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_Ch2_05.py

import numpy as np

# define a column vector
a = np.array([[2], [2]])

b = 2*a
c = -1.5*a