numpy.ma.MaskedArray.torecords

method

MaskedArray.torecords(self) [source]

Transforms a masked array into a flexible-type array.

The flexible type array that is returned will have two fields:

• the _data field stores the _data part of the array.
• the _mask field stores the _mask part of the array.

Parameters

None

Returns

recordndarray

A new flexible-type ndarray with two fields: the first element containing a value, the second element containing the corresponding mask boolean. The returned record shape matches self.shape.

Notes

A side-effect of transforming a masked array into a flexible ndarray is that meta information (fill_value, …) will be lost.

Examples

>>> x = np.ma.array([[1,2,3],[4,5,6],[7,8,9]], mask=[0] + [1,0]*4)
>>> x
masked_array(
  data=[[1, --, 3],
        [--, 5, --],
        [7, --, 9]],
  mask=[[False,  True, False],
        [ True, False,  True],
        [False,  True, False]],
  fill_value=999999)
>>> x.toflex()
array([[(1, False), (2,  True), (3, False)],
       [(4,  True), (5, False), (6,  True)],
       [(7, False), (8,  True), (9, False)]],
      dtype=[('_data', '<i8'), ('_mask', '?')])