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The FFT plot does not shows up, it is empty

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Valeriya Kostyukova
Valeriya Kostyukova 2023 年 6 月 10 日
コメント済み: Star Strider 2023 年 6 月 10 日
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:
  2 件のコメント
Simon Chan
Simon Chan 2023 年 6 月 10 日
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.
Valeriya Kostyukova
Valeriya Kostyukova 2023 年 6 月 10 日
I have attached the file, thanks

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Star Strider
Star Strider 2023 年 6 月 10 日
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 件のコメント
Valeriya Kostyukova
Valeriya Kostyukova 2023 年 6 月 10 日
thanks a lot!
Star Strider
Star Strider 2023 年 6 月 10 日
My pleasure!
If my Answer helped you solve your problem, please Accept it!
.

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