numpy.ma.notmasked_edges()函数| Python

numpy.ma.notmasked_edges()函数查找沿轴的第一个和最后一个未屏蔽值的索引。
如果所有值都被屏蔽，则返回 None。否则，返回两个元组的列表，分别对应第一个和最后一个未屏蔽值的索引。

Syntax : numpy.ma.notmasked_edges(arr, axis = None)

Parameters :
arr : [array_like] The input array.
axis : [int, optional] Axis along which to perform the operation. Default is None.

Return : [ ndarray or list] An array of start and end indexes if there are any masked data in the array. If there are no masked data in the array, edges is a list of the first and last index.

代码#1：

# Python program explaining
# numpy.ma.notmasked_edges() function
  
# importing numpy as geek  
# and numpy.ma module as ma 
import numpy as geek 
import numpy.ma as ma 
  
arr = geek.arange(12).reshape((3, 4))
  
gfg = geek.ma.notmasked_edges(arr)
  
print (gfg)

输出 ：

[ 0, 11]

代码#2：

# Python program explaining
# numpy.ma.notmasked_edges() function
  
# importing numpy as geek  
# and numpy.ma module as ma 
import numpy as geek 
import numpy.ma as ma 
  
arr = geek.arange(12).reshape((3, 4))
m = geek.zeros_like(arr)
m[1:, 1:] = 1
  
am = geek.ma.array(arr, mask = m)
  
gfg = geek.ma.notmasked_edges(am)
  
print (gfg)

输出 ：

[0, 8]