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# pandas.Index.flatten

`Index.``flatten`(order='C')

  Return a copy of the array collapsed into one dimension.

  Parameters : | order : {‘C’, ‘F’, ‘A’}, optional Whether to flatten in C (row-major), Fortran (column-major) order, or preserve the C/Fortran ordering from a. The default is ‘C’.
  Returns : | y : ndarray A copy of the input array, flattened to one dimension.

  See also

  `ravel`
    Return a flattened array.
  `flat`
    A 1-D flat iterator over the array.

  Examples

      >>> a = np.array([[1,2], [3,4]])
      >>> a.flatten()
      array([1, 2, 3, 4])
      >>> a.flatten('F')
      array([1, 3, 2, 4])

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