Why use fftshift(fft(fftshift(x))) in Matlab instead of fft(x)?: All Files - File Exchange

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from Why use fftshift(fft(fftshift(x))) in Matlab instead of fft(x)? by Kan Wu
Explain why we use fftshift(fft(fftshift(x))) in Matlab instead of fft(x)

All files for Why use fftshift(fft(fftshift(x))) in Matlab instead of fft(x)?
/Why_use_fftshift(fft(fftshift(x)))__in_Matlab.pdf /license.txt