The FFT plot does not shows up, it is empty
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Valeriya Kostyukova
el 10 de Jun. de 2023
Comentada: Star Strider
el 10 de Jun. de 2023
I want to get FFT of a vibration signal that is rrecorded in csv file. Fortunately, the figure with the plot of the signal displays correct data. However, when I try to perform fft, the figure is empty. I do not know of it is because of my code, the signal (or csv), or the MATLAB settings. Could you please help me to solve the problem.
Here is the code:
data = readtable('scope_0.csv');
column2 = data.Var2;
figure;
plot(column2(1:2000));
fs = 40000;
l1 = length(column2);
fft_result = fft(column2, l1);
fft_abs = abs(fft_result);
t = 0:1/fs:2000/fs;
freq = 0 : (1/t(end)) : fs/2 - (1/t(end));
figure;
plot(freq, fft_abs(1:length(freq)));
And the figures:
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/1407554/image.png)
2 comentarios
Simon Chan
el 10 de Jun. de 2023
Could you restart MATLAB and try to run it again?
If it is still not successful, could you attach your data so that we can try to reproduce the same problem or not.
Respuesta aceptada
Star Strider
el 10 de Jun. de 2023
Perhaps:
data(isinf(data)) = NaN;
data = fillmissing(data, 'linear');
since there may be a NaN or Inf value in ‘data’ that is causing the problem.
It would help to have the ‘scope_0.csv’ file.
4 comentarios
Star Strider
el 10 de Jun. de 2023
My pleasure!
If my Answer helped you solve your problem, please Accept it!
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