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.

Question

Ray Huang 2018-5-12

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https://ww2.mathworks.cn/matlabcentral/answers/400419-i-m-a-newbie-i-have-a-data-as-shown-below-how-to-do-write-matlab-code-for-fft-of-this-kind-of-an-a

回答： KALYAN ACHARJYA 2018-5-12

image.png

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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Answer 1

KALYAN ACHARJYA 2018-5-12

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https://ww2.mathworks.cn/matlabcentral/answers/400419-i-m-a-newbie-i-have-a-data-as-shown-below-how-to-do-write-matlab-code-for-fft-of-this-kind-of-an-a#answer_319921

在 MATLAB Online 中打开

    % 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');