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rearranges the outputs of fft by moving the zero-frequency component to the center of the array
fftshift(y)
Rearranged version of the vector $y$
A vector
Marc Raimondo
Raimondo, M. and Stewart, M. (2007), `The WaveD Transform in R', Journal of Statistical Software.
fft
print(fftshift(1:5))
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