python 三维数组 w4[:, 1] 取值

Posted 2022-10-26 gz153016

import numpy as np
a = [1, 2, 3] ; b = [4, 5, 6]; c = [7, 8, 9] ; d = [10,11,12]

# 每一页 / 每一个二维数组内容不同：
w3 = np.array( [ [a,b], [a,c], [b,c], [a,d] ] )
w4 = np.array( [ [a,b,d], [a,c,d], [b,c,d],[a,a,d]] )

print('w3:\\n', w3.shape) #  (4, 2, 3)
print('w4:\\n', w4.shape) #  (4, 3, 3)

print('w3[:, 1]:\\n', w3[:, 1].shape) # (4, 3)
print('w4[:, 1]:\\n', w4[:, 0].shape) # (4, 3)


print('w3:\\n', w3)

print('w3[:, 0]:\\n', w3[:, 0])

print('w4:\\n', w4)
print('w4[:, 1]:\\n', w4[:, 1])


w3:
 [
 [[ 1  2  3]
  [ 4  5  6]]
  
 [[ 1  2  3]
  [ 7  8  9]]
  
 [[ 4  5  6]
  [ 7  8  9]]
  
 [[ 1  2  3]
  [10 11 12]]
  ]
  
w3[:, 0]:
 [[1 2 3]
 [1 2 3]
 [4 5 6]
 [1 2 3]]
w4:
 [[[ 1  2  3]
  [ 4  5  6]
  [10 11 12]]

 [[ 1  2  3]
  [ 7  8  9]
  [10 11 12]]

 [[ 4  5  6]
  [ 7  8  9]
  [10 11 12]]

 [[ 1  2  3]
  [ 1  2  3]
  [10 11 12]]]
w4[:, 1]:
 [[4 5 6]
 [7 8 9]
 [7 8 9]
 [1 2 3]]