# numpy.ma.flatnotmasked_edges

ma.flatnotmasked_edges(a)

  Find the indices of the first and last unmasked values.

  Expects a 1-D `MaskedArray`, returns None if all values are masked.

  Parameters:
    a array_like

      Input 1-D `MaskedArray`

  Returns:
    edges ndarray or None

      The indices of first and last non-masked value in the array. Returns None if all values are masked.

  See also

  `flatnotmasked_contiguous`, `notmasked_contiguous`, `notmasked_edges`
  `clump_masked`, `clump_unmasked`

  Notes

  Only accepts 1-D arrays.

  Examples

      >>> a = np.ma.arange(10)
      >>> np.ma.flatnotmasked_edges(a)
      array([0, 9])

      >>> mask = (a < 3) | (a > 8) | (a == 5)
      >>> a[mask] = np.ma.masked
      >>> np.array(a[~a.mask])
      array([3, 4, 6, 7, 8])

      >>> np.ma.flatnotmasked_edges(a)
      array([3, 8])

      >>> a[:] = np.ma.masked
      >>> print(np.ma.flatnotmasked_edges(a))
      None