what is the Code for FFT???

I have a saved signal in workspace .mat data. I have attached the pic.

plz left me the code of FFT. thank you so much.

How can I gain its FFT???

Answer 1

[Star Strider]

You don’t provide much to work with, but assuming you want to take the fft of ‘y’ that corresponds to uniform sampling times in ‘t’:

Ts = t(2)-t(1);                             % Sampling Interval
Fs = 1/Ts;                                  % Sampling Frequency
Fn = Fs/2;                                  % Nyquist Frequency
Ly = length(y);

yfft = fft(y)/Ly;
Fv = linspace(0, 1, fix(Ly/2)+1)*Fn;        % Frequency Vector
Iv = 1:length(Fv);                          % Index Vector

figure(1)
plot(Fv, abs(yfft(Iv)))
grid