Classifier
Addition
p17 For addition simply use + operator.
""" Addition and Substraction (+ -)
"""
import numpy as np
A = np.array([
[1, 1],
[2, 2],
])
B = np.array([
[1, 1],
[3, 3],
])
C = np.add(A, A) # first method
C = A + B # second method
print(C)
# [2 2]
# [5 5]
assert (np.add(A, A) == (A + A)) .all() # passed
Multiplication
p17 For element-wise multiplication we use *
""" Matrix addition
For element-wise multiplication we use *
"""
import numpy as np
A = np.array([
[1, 1],
[2, 2],
])
B = np.array([
[1, 1],
[3, 3],
])
C = np.dot(A, B) # first method
C = A @ B # second method
E = A * B # element-wise multiplication
print(C)
# [4 4]
# [8 8]
print(E)
# [1 1]
# [6 6]
assert (np.dot(A, A) == (A @ A)) .all() # passed
assert (E[1, 1] == 6) # passed
➥ Questions
Last update: 47 days ago
