This is documentation for an old release of NumPy (version 1.19). Read this page Search for this page in the documentation of the latest stable release (version 2.2).

numpy.fft.ifftshift

numpy.fft.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

xarray_like

Input array.

axesint or shape tuple, optional

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

Returns

yndarray

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.]])