import numpy as np

m = np.matrix('[1, 2; 3, 4]')
print(m[0][0])

I expected to see 1. But it shows me [[1 2]]. How can I get 1 instead?

CodePudding user response：

As Tranbi mentioned, the np.matrix official documentation states:

It is no longer recommended to use this class, even for linear algebra. Instead use regular arrays. The class may be removed in the future.

If you still wish to use np.matrix, it supports the np.matrix.item() method, and you can get the first element by:

m.item((0, 0))

or

m.item(0)

which will yield:

1

If you do follow the recommendation of switching to np.array,

m = np.array([[1, 2], [3, 4]])
m[0][0]

would yield 1