Failed to change one value in numpy matrix

Question

When using matrix in numpy, I want to change the value of one element in a matrix using the index, but the result I got is strange.

How can I change one value in indexing method?

arr = np.array([[1, 2, 3, 4], [5, 6, 7, 8]])
mat1 = np.mat(arr)
mat1[1][0] = 3
print(arr)

[[1 2 3 4]
 [3 3 3 3]]

LittlePanic404 · Accepted Answer · 2021-12-10 12:57:51Z

2

Do the following change:

mat1[1][0] = 3 -> mat1[1,0] = 3

answered Dec 10, 2021 at 12:57

LittlePanic404

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