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# pandas.Index.setfield

`Index.``setfield`(val, dtype, offset=0)

  Put a value into a specified place in a field defined by a data-type.

  Place val into a‘s field defined by dtype and beginning offset bytes into the field.

  Parameters : | val : object Value to be placed in field. dtype : dtype object Data-type of the field in which to place val. offset : int, optional The number of bytes into the field at which to place val.
  Returns : | None

  See also

  `getfield`

  Examples

      >>> x = np.eye(3)
      >>> x.getfield(np.float64)
      array([[ 1.,  0.,  0.],
             [ 0.,  1.,  0.],
             [ 0.,  0.,  1.]])
      >>> x.setfield(3, np.int32)
      >>> x.getfield(np.int32)
      array([[3, 3, 3],
             [3, 3, 3],
             [3, 3, 3]])
      >>> x
      array([[  1.00000000e+000,   1.48219694e-323,   1.48219694e-323],
             [  1.48219694e-323,   1.00000000e+000,   1.48219694e-323],
             [  1.48219694e-323,   1.48219694e-323,   1.00000000e+000]])
      >>> x.setfield(np.eye(3), np.int32)
      >>> x
      array([[ 1.,  0.,  0.],
             [ 0.,  1.,  0.],
             [ 0.,  0.,  1.]])

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