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Python matrix m行n列成分を取り出したい

Posted at 2021-06-03

リストの場合

m = [[10, 20], [30, 40]]
print(m[0][1])

matrix クラスを使用する場合

import numpy as np
m = [[10, 20], [30, 40]]
mat = np.matrix(m)
mat[0][1]

IndexError: index 1 is out of bounds for axis 0 with size 1

import numpy as np
m = [[10, 20], [30, 40]]
mat = np.matrix(m)
mat[0].A1[1]

参考記事