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numpy.fft.ifftshift

numpy.fft.ifftshift(x, axes=None)[source]

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

>>> 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.]])

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