identity matrix in python

68Duck answered on March 5, 2021 Popularity 9/10 Helpfulness 8/10

answer identity matrix in python

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identity matrix in python

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#Change the value 3 to the size of the identity matrix
>>>np.identity(3)
array([[1.,  0.,  0.],
       [0.,  1.,  0.],
       [0.,  0.,  1.]])

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Source: numpy.org

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Contributed on Mar 05 2021

68Duck

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identity matrix python

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# first solution using NumPy and a second one without it

# 1st ****using NumPy****
>>>import numpy as np
>>>np.identity(5) # change value 5 to change matrix size
# output will be an Array
array([[1., 0., 0., 0., 0.],
       [0., 1., 0., 0., 0.],
       [0., 0., 1., 0., 0.],
       [0., 0., 0., 1., 0.],
       [0., 0., 0., 0., 1.]])

# 2nd ****without using NumPy****

>>>matrix_size = 5 # change value 5 to change matrix size
# use list comprehension
>>>identity_matrix = [
                  [1 if num == index else 0 for index in range(matrix_size)]
                  for num in range(matrix_size)
                  ]
>>>identity_matrix
# output will be a list
[[1, 0, 0, 0, 0],
 [0, 1, 0, 0, 0],
 [0, 0, 1, 0, 0],
 [0, 0, 0, 1, 0],
 [0, 0, 0, 0, 1]]

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Source: Grepper

Tags: identity identit

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Contributed on Jul 05 2022

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identity matrix in python

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