numpy.ma.getmaskarray

numpy.ma.getmaskarray(arr)[源代码]

Return the mask of a masked array, or full boolean array of False.

Return the mask of arr as an ndarray if arr is a MaskedArray and the mask is not nomask, else return a full boolean array of False of the same shape as arr.

Parameters:
arr : array_like

Input MaskedArray for which the mask is required.

参见

getmask
Return the mask of a masked array, or nomask.
getdata
Return the data of a masked array as an ndarray.

Examples

>>> import numpy.ma as ma
>>> a = ma.masked_equal([[1,2],[3,4]], 2)
>>> a
masked_array(data =
 [[1 --]
 [3 4]],
      mask =
 [[False  True]
 [False False]],
      fill_value=999999)
>>> ma.getmaskarray(a)
array([[False,  True],
       [False, False]])

Result when mask == nomask

>>> b = ma.masked_array([[1,2],[3,4]])
>>> b
masked_array(data =
 [[1 2]
 [3 4]],
      mask =
 False,
      fill_value=999999)
>>> >ma.getmaskarray(b)
array([[False, False],
       [False, False]])