flopscope.numpy.fft.ifftshift
fnp.fft.ifftshift(x, axes=None)[flopscope source][numpy source]
The inverse of `fftshift`. Although identical for even-length `x`, the functions differ by one sample for odd-length `x`.
Adapted from NumPy docs np.fft.ifftshift
Cost
0
Flopscope Context
Inverse of fftshift. No arithmetic; index reordering only.
The inverse of fftshift. Although identical for even-length x, the functions differ by one sample for odd-length x.
Parameters
- x:array_like
Input array.
- axes:int or shape tuple, optional
Axes over which to calculate. Defaults to None, which shifts all axes.
Returns
- y:ndarray
The shifted array.
See also
- fftshift Shift zero-frequency component to the center of the spectrum.
Examples
>>> import flopscope.numpy as fnp
>>> freqs = flops.fft.fftfreq(9, d=1./9).reshape(3, 3)
>>> freqs
array([[ 0., 1., 2.],
[ 3., 4., -4.],
[-3., -2., -1.]])
>>> flops.fft.ifftshift(flops.fft.fftshift(freqs))
array([[ 0., 1., 2.],
[ 3., 4., -4.],
[-3., -2., -1.]])