python调用数组里某一个元素

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python调用数组里某一个元素

TL；DR：>>> import numpy as np

>>>

>>> arr = np.array([[1,2,3,4,5],[6,7,8,9,10]])

>>>

>>> arr[0,0]

1

>>> arr[1,1]

7

>>> arr[1,0]

6

>>> arr[1,-1]

10

>>> arr[1,-2]

9

长：

希望这有助于您理解：>>> import numpy as np

>>> np.array([ [1,2,3], [4,5,6] ])

array([[1, 2, 3],

[4, 5, 6]])

>>> x = np.array([ [1,2,3], [4,5,6] ])

>>> x[1][2] # 2nd row, 3rd column

6

>>> x[1,2] # Similarly

6

但要理解为什么slicing在更多维度上是有用的：>>> np.array([ [[1,2,3], [4,5,6]], [[7,8,9],[10,11,12]] ])

array([[[ 1, 2, 3],

[ 4, 5, 6]],

[[ 7, 8, 9],

[10, 11, 12]]])

>>> x &#