numpy.ma.MaskedArray.nonzero()函数– Python

numpy.ma.MaskedArray.nonzero()函数返回不为零的未屏蔽元素的索引。此函数返回一个数组元组，每个维度一个，包含该维度中非零元素的索引。

Syntax : numpy.ma.MaskedArray.nonzero(self)

Return : [tuple] Indices of elements that are non-zero.

代码#1：

# Python program explaining
# numpy.ma.MaskedArray.nonzero() function
    
# importing numpy as geek   
# and numpy.ma module as ma  
import numpy as geek  
import numpy.ma as ma
   
arr = ma.array(geek.eye(5))
  
gfg = arr.nonzero()
  
print (gfg)

输出 ：

(array([0, 1, 2, 3, 4]), array([0, 1, 2, 3, 4]))

代码#2：

# Python program explaining
# numpy.ma.MaskedArray.nonzero() function
    
# importing numpy as geek   
# and numpy.ma module as ma  
import numpy as geek  
import numpy.ma as ma
   
arr = ma.array([[1, 2, 3], [4, 5, 6], [7, 8, 9]])
  
gfg = ma.nonzero(arr > 3)
  
print (gfg)

输出 ：

(array([1, 1, 1, 2, 2, 2]), array([0, 1, 2, 0, 1, 2]))