what is the difference in fft(x,1024) and fft(x,2048)?

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amuka anurag 2021-3-9

编辑： Matt J 2021-3-9

x=fft(x,1024);
x=fft(x,2048);
x=fft(x);

%what is the difference between all these if i have done zero padding and the length of the signal is 2048 .

Matt J 2021-3-9

编辑：Matt J 2021-3-9

The 2nd and 3rd cases are equivalent. The 1st case is the same as if you had discarded the last 1024 x(i), as can be seen from,

x=rand(1,2048);
isequal(  fft(x,1024)  ,fft(x(1:1024)) )
ans = logical
   1

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