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scipy.fftpack.

# ifftshift

scipy.fftpack.ifftshift(x, axes=None)

  The inverse of `fftshift`. Although identical for even-length x, the functions differ by one sample for odd-length x.

  Parameters:
    x array_like

      Input array.

    axes int or shape tuple, optional

      Axes over which to calculate. Defaults to None, which shifts all axes.

  Returns:
    y ndarray

      The shifted array.

  See also

  `fftshift`

    Shift zero-frequency component to the center of the spectrum.

  Examples

      >>> import numpy as np
      >>> freqs = np.fft.fftfreq(9, d=1./9).reshape(3, 3)
      >>> freqs
      array([[ 0.,  1.,  2.],
             [ 3.,  4., -4.],
             [-3., -2., -1.]])
      >>> np.fft.ifftshift(np.fft.fftshift(freqs))
      array([[ 0.,  1.,  2.],
             [ 3.,  4., -4.],
             [-3., -2., -1.]])