scipy.fftpack.
ifftshift#
- scipy.fftpack.ifftshift(x, axes=None)#
- 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
- Shift zero-frequency component to the center of the spectrum. 
 - Examples - >>> import numpy as np >>> 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.]])