Difference between FFT(FFT(X)) ,FFT2(X) and FFT(X,[ ],2)

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Sidharth ramesh
Sidharth ramesh on 24 Jun 2021
Answered: dpb on 25 Jun 2021
What is the difference between FFT(FFT(X)) ,FFT2(X) and FFT(X,[ ],2) ?

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Accepted Answer

dpb
dpb on 25 Jun 2021
As the doc for fft2 shows
fft2(X) == fft(fft(X).')
or the 2D FFT is computed sequentially by 1D and then transposing and 1D the other way.
fft(X,[],2)
is just 1D FFT but by row (2nd dimension) instead of the default by column if X is 2D array.

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