numpy.ma.maskearray.非零()函数–Python

原文:https://www . geeksforgeeks . org/numpy-ma-masked array-非零-function-python/

numpy.ma.MaskedArray.nonzero() 函数返回不为零的未屏蔽元素的索引。这个函数返回一组数组，每个维度一个数组，包含该维度中非零元素的索引。

语法: numpy.ma.MaskedArray .非零(自)

返回:【元组】非零元素的索引。

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]))