nlcpy.fft.ifftshift

nlcpy.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

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: Shifts the zero-frequency component to the center of the spectrum.

Examples

>>> import nlcpy as vp
>>> freqs = vp.fft.fftfreq(9, d=1./9).reshape(3, 3)
>>> freqs
array([[ 0.,  1.,  2.],
       [ 3.,  4., -4.],
       [-3., -2., -1.]])
>>> vp.fft.ifftshift(vp.fft.fftshift(freqs))
array([[ 0.,  1.,  2.],
       [ 3.,  4., -4.],
       [-3., -2., -1.]])