numpy.fft.ifftshift
-
numpy.fft.ifftshift(x, axes=None)
[source] -
The inverse of
fftshift
. Although identical for even-lengthx
, the functions differ by one sample for odd-lengthx
.- 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.]])
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https://numpy.org/doc/1.19/reference/generated/numpy.fft.ifftshift.html