I'm a newbie. I have a data as shown below. How to do write MATLAB code for FFT of this kind of an arbitrary signal? Thanks.
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Ray Huang
on 12 May 2018
Answered: KALYAN ACHARJYA
on 12 May 2018
Time(s) Amplitude 0.707 0.707 1.401 0.694 2.104 0.703 2.803 0.699 3.497 0.694 4.183 0.686 4.869 0.686 5.575 0.706 6.288 0.713 7.007 0.719 7.711 0.704 8.401 0.69 9.098 0.697 9.8 0.702 10.505 0.705 11.192 0.687 11.876 0.684
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KALYAN ACHARJYA
on 12 May 2018
% Are you looking for this one
amplitude=[ 0.707 0.694 0.703 0.699 0.694 0.686 0.686 0.706 0.713 0.719 0.704 0.69 0.697 0.702 0.705 0.687 0.684];
t=[0.707 1.401 2.104 2.803 3.497 4.183 4.869 5.575 6.288 7.007 7.711 8.401 9.098 9.8 10.505 11.192 11.876];
%nfft=; % Length of FFT);
subplot(211);plot(t,amplitude);
xlabel('Time'); ylabel('Amplitude');
k=fft([t,amplitude]);
subplot(212);plot(k);
xlabel('Frequency'); ylabel('Power');
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