
Add, subtract, multiply NumPy array
In Python, a vector can be expressed by NumPy array.
import numpy as np
v = np.array([1, 3.1])
v1 = -v
v2 = v * 2
v3 = v * (-3)
v4 = v + v
v5 = v - v
print(v1) # [-1. -3.1]
print(v2) # [2. 6.2]
print(v3) # [-3. -9.3]
print(v4) # [2. 6.2]
print(v5) # [0. 0.]
NumPy array can be added, subtracted, multiplied. *
symbol must be written clearly to work multiplying.
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