At frequency f >10^6, the program is very slow to calculate the FFT. Please let me know if there is a faster method. Thank you. Regards HDaniel

Question

hani daniel 2016-3-4

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https://ww2.mathworks.cn/matlabcentral/answers/271474-at-frequency-f-10-6-the-program-is-very-slow-to-calculate-the-fft-please-let-me-know-if-there-is

编辑： Walter Roberson 2016-3-4

% fft_sinewave_1.m
Fs=1*10^7;
t = 0:1/Fs:1;
v = 1;
f = 10^6;
y = v*sin(2*pi*f*t);
nfft=1024;
Y = fft(y,nfft);
Y=Y(1:nfft/2);
mx=abs(Y);
f=(0:nfft/2-1)*Fs/nfft;
plot(f,mx);
grid on;

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Answer 1

John D'Errico 2016-3-4

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There is no magic to be had. You can alway make any problem sufficiently large that is starts to take appreciable time to run. Had you a bigger, faster computer, you would have asked the same question, just with a bigger problem.

So, get a cup of coffee and relax. Read a book while it does its work. Or try to solve smaller problems. Or find a bigger, faster computer.