Extrapolation using fft in octave
- by CFP
Using GNU octave, I'm computing a fft over a piece of signal, then eliminating some frequencies, and finally reconstructing the signal. This give me a nice approximation of the signal ; but it doesn't give me a way to extrapolate the data.
Suppose basically that I have plotted three periods and a half of
f: x -> sin(x) + 0.5*sin(3*x) +…