numpy.ma.masked_array.count¶
method

masked_array.
count
(axis=None, keepdims=<no value>)[源代码]¶ Count the nonmasked elements of the array along the given axis.
Parameters:  axis : None or int or tuple of ints, optional
Axis or axes along which the count is performed. The default (axis = 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.
1.10.0 新版功能.
If this is a tuple of ints, the count is performed on multiple axes, instead of a single axis or all the axes as before.
 keepdims : bool, optional
If this is set to True, the axes which are reduced are left in the result as dimensions with size one. With this option, the result will broadcast correctly against the array.
Returns:  result : ndarray or scalar
An array with the same shape as the input array, with the specified axis removed. If the array is a 0d array, or if axis is None, a scalar is returned.
参见
count_masked
 Count masked elements in array or along a given axis.
Examples
>>> import numpy.ma as ma >>> a = ma.arange(6).reshape((2, 3)) >>> a[1, :] = ma.masked >>> a masked_array(data = [[0 1 2] [  ]], mask = [[False False False] [ True True True]], fill_value = 999999) >>> a.count() 3
When the axis keyword is specified an array of appropriate size is returned.
>>> a.count(axis=0) array([1, 1, 1]) >>> a.count(axis=1) array([3, 0])