How can I show that the matlab IFFT is accurate enough?
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I have no experience with fft and ifft and I just started using them. First I was asked to simulate a forced damped harmonic system in matlab (with code of course) and then do the fft analysis. Then I was asked to basically reconstruct the original wave from what I got back from fft, I thought of using ifft but shall I do it by hand? how hard ? shall I just use ifft? how accurate is it? Thanks everyone
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Wayne King
2012 年 10 月 11 日
x = randn(1000,1);
xdft = fft(x);
y = ifft(xdft);
max(abs(x-y))
As long as you don't modify the Fourier transform coefficients before you take the inverse, I think you'll find it's very accurate.
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