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

numpy.ma.MaskedArray.count()函数沿给定轴计算数组的非屏蔽元素。

Syntax : numpy.ma.MaskedArray.count(self, axis=None, keepdims = no value)

Parameters :
axis : [None or int or tuple of ints, optional] Axis along which the count is performed. The default axis is None, performs the count over all the dimensions of the input array. axis may be negative, in which case it counts from the last to the first axis.
keepdims : [bool, optional] If this is set to True, the axis which is reduced are left in the result as dimensions with size one. With this option, the result will broadcast correctly against the array.

Return : [ndarray or scalar] An array with the same shape as the input array, with the specified axis removed. If the array is a 0-d array, or if axis is None, a scalar is returned.

代码#1：

# Python program explaining
# numpy.ma.MaskedArray.count() function
    
# importing numpy as geek   
# and numpy.ma module as ma  
import numpy as geek  
import numpy.ma as ma
   
arr = ma.arange(6).reshape((2, 3))
arr[1, :] = ma.masked
  
gfg = arr.count(axis = 0)
  
print (gfg)

输出 ：

[1 1 1]

代码#2：

# Python program explaining
# numpy.ma.MaskedArray.count() function
    
# importing numpy as geek   
# and numpy.ma module as ma  
import numpy as geek  
import numpy.ma as ma
   
arr = ma.arange(6).reshape((2, 3))
arr[1, :] = ma.masked
  
gfg = arr.count()
  
print (gfg)

输出 ：

3