numpy. tile()

Reference resources  numpy.tile() - cloud + Community - Tencent cloud

Copy the array in all directions , such as a = np.array([0,1,2]),    np.tile(a,(2,1)) Is to put a First along x Axis （ Let's call it that way ） Copy 1 times , That is, there is no copy , Still [0,1,2]. Then put the result along y Direction copy 2 times , That is, finally get

 array([[0,1,2],

             [0,1,2]])

Empathy ：

>>> b = np.array([[1, 2], [3, 4]])
>>> np.tile(b, 2) # Along the X Axis copy 2 times 
array([[1, 2, 1, 2],
       [3, 4, 3, 4]])
>>> np.tile(b, (2, 1))# Along the X Axis copy 1 times （ Equivalent to no copy ）, Reengaging Y Axis copy 2 times 
array([[1, 2],
       [3, 4],
       [1, 2],
       [3, 4]])