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

19 visualizzazioni (ultimi 30 giorni)
amuka anurag il 9 Mar 2021
Modificato: Matt J il 9 Mar 2021
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 .
##### 0 CommentiMostra -2 commenti meno recentiNascondi -2 commenti meno recenti

Accedi per commentare.

### Risposte (1)

Matt J il 9 Mar 2021
Modificato: Matt J il 9 Mar 2021
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
##### 0 CommentiMostra -2 commenti meno recentiNascondi -2 commenti meno recenti

Accedi per commentare.

### Categorie

Scopri di più su Fourier Analysis and Filtering in Help Center e File Exchange

### Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by