Find index of 2d array in a 3d array in numpy

Question

I want to find a 2d array in a 3d array. for finding a 1d array in a 2d array I can use np.where(np.all(a==b, axis=1))[0][0] .

>>> import numpy as np
>>>
>>> a = np.array([[[1, 0, 0],
                   [0, 0, 0],
                   [0, 0, 0]],

                  [[0, 0, 0],
                   [0, 0, 0],
                   [0, 0, 0]]])
>>>
>>> b = np.array([[1, 0, 0],
                  [0, 0, 0],
                  [0, 0, 0]])
>>>
>>> a.find(b)
0

Answer 1

axis关键字接受元组，因此您可以简单地执行以下操作：

np.where(np.all(a==b, axis=(1, 2)))[0][0]