# np.expand_dims()
###### tags: `python語法`

import numpy as np

a = np.array([[[1,2,3,4],[4,5,6,7]]])
a.shape
(1, 2, 4)

np.expand_dims(a, axis=0)表示在0位置新增資料(增加維度)

b = np.expand_dims(a, axis=0)
b
array([[[[1, 2, 3, 4],
          [4, 5, 6, 7]]]]),
 
b.shape
(1, 1, 2, 4)

np.expand_dims(a, axis=1)表示在1位置新增資料(增加維度)

c = np.expand_dims(a, axis=1)
c
array([[[[1, 2, 3, 4],
          [4, 5, 6, 7]]]]),

c.shpae
(1, 1, 2, 4)

np.expand_dims(a, axis=2)表示在2位置新增資料(增加維度)

d = np.expand_dims(a, axis=2)
d
array([[[[1, 2, 3, 4]],
 
         [[4, 5, 6, 7]]]]),

d.shape
(1, 2, 1, 4)

np.expand_dims(a, axis=3)表示在3位置新增資料(增加維度)

e = np.expand_dims(a, axis=3)
e
array([[[[1],
          [2],
          [3],
          [4]],
 
         [[4],
          [5],
          [6],
          [7]]]]),

e.shape
(1, 2, 4, 1)