Is this code for fft correct

Sakib Bin Helal

2023 8 9

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2 次查看（30 天）

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I have the following code for FFT. But I can't tell if its correct or not. Is the code correct?

%: Read the excel file using readtable function
rawTable = readtable('DS0009A.CSV','PreserveVariableNames',true);
X=rawTable{:,1};
Y=rawTable{:,2};
figure
plot(X,Y)
Fs=1000;
y= rawTable{:,2};
F=fft(y);
l=length(y);
p2=abs(F/l);
p1 = p2(1:l/2+1);
p1(2:end-1) = 2*p1(2:end-1);
f = Fs*(0:(l/2))/l;
figure
plot(f,p1)
xlim([0 5])

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Jon 2023-8-9

You will need to attach your data file if you want someone to be able to try running your code.

There are very complete examples for using fft in the MATLAB documentation, type doc fft on your command line or Google matlab fft

If you are not confident using the fft, I suggest making a signal where you know what the expected results are. For example make a signal that is a sum of a few sin waves at different frequencies and amplitudes, and then try fft on that signal.

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