# numpy.ma.masked_all

ma.masked_all(shape, dtype=<class 'float'>)

  Empty masked array with all elements masked.

  Return an empty masked array of the given shape and dtype, where all the data are masked.

  Parameters
    shape tuple

      Shape of the required MaskedArray.

    dtype dtype, optional

      Data type of the output.

  Returns
    a MaskedArray

      A masked array with all data masked.

  See also

  `masked_all_like`

    Empty masked array modelled on an existing array.

  Examples

      >>> import numpy.ma as ma
      >>> ma.masked_all((3, 3))
      masked_array(
        data=[[--, --, --],
              [--, --, --],
              [--, --, --]],
        mask=[[ True,  True,  True],
              [ True,  True,  True],
              [ True,  True,  True]],
        fill_value=1e+20,
        dtype=float64)

  The `dtype` parameter defines the underlying data type.

      >>> a = ma.masked_all((3, 3))
      >>> a.dtype
      dtype('float64')
      >>> a = ma.masked_all((3, 3), dtype=np.int32)
      >>> a.dtype
      dtype('int32')

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