Python numpy.rollaxis()用法及代码示例

numpy.rollaxis()函数将指定的轴向后滚动，直到它位于给定的位置。

用法： numpy.rollaxis(arr, axis, start=0)

参数：

arr  :[ndarray] Input array.

axis  :[int] The axis to roll backwards. The positions of the other axes do not change relative to one another.

start  :[int, optional] The axis is rolled until it lies before this position. The default, 0, results in a “complete” roll.

Return :[ndarray] In earlier NumPy versions, arr is returned only if the order of the axes is changed, otherwise the input array is returned. For NumPy >= 1.10.0, a view of arr is always returned.

代码1：

# Python program explaining 
# numpy.rollaxis() function 
  
# importing numpy as geek  
import numpy as geek 
  
arr = geek.ones((1, 2, 3, 4)) 
  
gfg = geek.rollaxis(arr, 3, 1).shape 
  
print (gfg)

输出：

(1, 4, 2, 3)

代码2：

# Python program explaining 
# numpy.rollaxis() function 
  
# importing numpy as geek  
import numpy as geek 
  
arr = geek.ones((1, 2, 3, 4)) 
  
gfg = geek.rollaxis(arr, 2).shape 
  
print (gfg)

输出：

(3, 1, 2, 4)

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