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ifftshift(X)
ifftshift undoes the results of fftshift.
If X is a vector, iffshift(X) swaps the left and right halves of X. For matrices, ifftshift(X) swaps the first quadrant with the third and the second quadrant with the fourth. If X is a multidimensional array, ifftshift(X) swaps half-spaces of X along each dimension.
fft, fft2, fftn, fftshift