how can i get my code to produce FFT graph.

This is my code below but doesnt work

L = length(signal);

Y = fft(signal);

Y1 = abs(Y);

% onlys show one sided FFT so multiply by 2, divide by Fs to scale.

Py = (2*Y1(1:L/2) / Fs);

% create frequency vector to plot against

freq = Fs/L*(0:L/2-1);

% plot the figure

figure

plot(freq,Py);

title('Amplitude Spectral Density');

xlabel('Frequency Hz');

ylabel('Amplitude');

grid on;

end

[dpb]

Please edit code to remove superfluous linefeeds and then select and use the "Code" button to format it...

Answer 1

[Vimal Rathod]

The code which you have given works perfectly fine, I suspect that you are not passing an appropriate signal to the fft function.

For more information refer to the link:

https://www.mathworks.com/help/matlab/ref/fft.html