What is the difference between ifft(f) and ifft(f,n)?
1 visualizzazione (ultimi 30 giorni)
Mostra commenti meno recenti
Hi. I have one vector f with some values of velocity in function of the frequency. I have to plot this velocities in function of the time. I don't know if I have to use ifft(f) or ifft(f,n). In this last case, what is n?
Thanks.
1 Commento
Daniel Shub
il 28 Gen 2013
I am not a huge fan of RTFM answers, but in this case ... what does help ifft or doc ifft say about what n is?
Risposte (1)
John Petersen
il 29 Gen 2013
Modificato: John Petersen
il 29 Gen 2013
if N =length(f), there is no difference between ifft(f) and ifft(f,N)
2 Commenti
John Petersen
il 4 Feb 2013
You can zero pad f so that it has the N samples. e.g. Say f is a 256 element column array and N = 400.
f1 = [f; zeros(400-256,1)];
iF = ifft(f);
iF1 = ifft(f1,N);
figure;plot(iF1);
hold on; plot(iF,'r')
Now you can see the difference, just zero padded at the end. Is this what you wanted?
Does the time vector correspond to the sampling points of the signal f?
Vedere anche
Categorie
Scopri di più su Graphics Object Programming 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!