Question

How to create an upper triangular matrix with sequenced increased elements in each row with Python

Answer 1

import numpy as np

n = 6
arr = np.cumsum(
        np.triu(
            np.ones((n, n))
        ), axis=1)

print(arr)



'''
run:

[[1. 2. 3. 4. 5. 6.]
 [0. 1. 2. 3. 4. 5.]
 [0. 0. 1. 2. 3. 4.]
 [0. 0. 0. 1. 2. 3.]
 [0. 0. 0. 0. 1. 2.]
 [0. 0. 0. 0. 0. 1.]]

'''

 

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