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.

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

Answer 1

[KALYAN ACHARJYA]

    % 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');