fftshift(x, axes=None)
This function swaps half-spaces for all axes listed (defaults to all). Note that y[0]
is the Nyquist component only if len(x)
is even.
Input array.
Axes over which to shift. Default is None, which shifts all axes.
The shifted array.
Shift the zero-frequency component to the center of the spectrum.
ifftshift
The inverse of :None:None:`fftshift`.
>>> freqs = np.fft.fftfreq(10, 0.1)
... freqs array([ 0., 1., 2., ..., -3., -2., -1.])
>>> np.fft.fftshift(freqs) array([-5., -4., -3., -2., -1., 0., 1., 2., 3., 4.])
Shift the zero-frequency component only along the second axis:
>>> freqs = np.fft.fftfreq(9, d=1./9).reshape(3, 3)
... freqs array([[ 0., 1., 2.], [ 3., 4., -4.], [-3., -2., -1.]])
>>> np.fft.fftshift(freqs, axes=(1,)) array([[ 2., 0., 1.], [-4., 3., 4.], [-1., -3., -2.]])See :
The following pages refer to to this document either explicitly or contain code examples using this.
dask.array.fft.ifftshift
dask.array.fft.fftshift
numpy.fft.ifftshift
numpy.fft.fft2
numpy.fft.fftn
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