NumPy参考 >例行程序 >Discrete Fourier Transform (numpy.fft) > 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.
Input array.
Axes over which to calculate. Defaults to None, which shifts all axes.
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.]])