The FFT plot does not shows up, it is empty
3 views (last 30 days)
Show older comments
Valeriya Kostyukova
on 10 Jun 2023
Commented: Star Strider
on 10 Jun 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 Comments
Simon Chan
on 10 Jun 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.
Accepted Answer
Star Strider
on 10 Jun 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 Comments
Star Strider
on 10 Jun 2023
My pleasure!
If my Answer helped you solve your problem, please Accept it!
.
More Answers (0)
See Also
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!