numpy.fft.ifftshift — NumPy v1.15 Manual (original) (raw)
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. |
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| Returns: | y : ndarray The shifted array. |
See also
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.]])