python - 怎么理解numpy的axis？

Question

1.假如我有一个二维数组:

[[0,1,2],[3,4,5],[6,7,8],[9,10,11]]

那么这里的轴axis怎么理解。axis在上面的数组中最大是多少。我没有看懂英文的教程，请详细解释一下。谢谢。

Answer 1

This is a 2-dimensional array...
The axis must be 0 or 1

Answer 2

You are two-dimensional
Learn linear algebra

Answer 3

axis means axis, number axis, and
corresponds to the dimension in a multi-dimensional array.
Your example is a 4 x 3 two-dimensional array with 2 axes: axis 0 and axis 1

---

>>> import numpy as np
>>> a = np.array([[0,1,2],[3,4,5],[6,7,8],[9,10,11]])
>>> a
array([[ 0,  1,  2],
       [ 3,  4,  5],
       [ 6,  7,  8],
       [ 9, 10, 11]])
>>> a.shape
(4, 3)
>>> a.ndim
2
>>>