def isMaskedArray(x):
return isinstance(x, MaskedArray)<EOL>
Test whether input is an instance of MaskedArray.

This function returns True if `x` is an instance of MaskedArray
and returns False otherwise.  Any object is accepted as input.

Parameters
----------
x : object
    Object to test.

Returns
-------
result : bool
    True if `x` is a MaskedArray.

See Also
--------
isMA : Alias to isMaskedArray.
isarray : Alias to isMaskedArray.

Examples
--------
>>> import numpy.ma as ma
>>> a = np.eye(3, 3)
>>> a
array([[ 1.,  0.,  0.],
       [ 0.,  1.,  0.],
       [ 0.,  0.,  1.]])
>>> m = ma.masked_values(a, 0)
>>> m
masked_array(data =
 [[1.0 -- --]
 [-- 1.0 --]
 [-- -- 1.0]],
      mask =
 [[False  True  True]
 [ True False  True]
 [ True  True False]],
      fill_value=0.0)
>>> ma.isMaskedArray(a)
False
>>> ma.isMaskedArray(m)
True
>>> ma.isMaskedArray([0, 1, 2])
False