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# numpy.ma.common_fill_value

`numpy.ma.``common_fill_value`(a, b)

  Return the common filling value of two masked arrays, if any.

  If `a.fill_value == b.fill_value`, return the fill value, otherwise return None.

  Parameters : | a, b : MaskedArray The masked arrays for which to compare fill values.
  Returns : | fill_value : scalar or None The common fill value, or None.

  Examples

      >>> x = np.ma.array([0, 1.], fill_value=3)
      >>> y = np.ma.array([0, 1.], fill_value=3)
      >>> np.ma.common_fill_value(x, y)
      3.0