Trying to transform data into FFT format

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Mason Condren
Mason Condren 2022-8-24
评论： Mason Condren 2022-8-24
I have been trying to convert data into FFT format, but it does not look like a wave in the graph. The columns I am calling to match the first plotted diagram. The data does not look like a wave up close as it should. I am assuming that is the problem.
%T = xlsread('Baseline.xlsx');
t = T(:,1);
x_t = T(:,5);
t=t-t(1);
plot(t,x_t);
S = [t,x_t]
X = fft(S)
plot(X)
  2 个评论
Walter Roberson
Walter Roberson 2022-8-24
Why are you taking a fourier transform of your time variable? Why does your time variable have duplicate values? Why does the other column contain nan or inf?
Mason Condren
Mason Condren 2022-8-24
From muy understanding the fft command is for a function. I only have data. So, I
converted the data into a 2x* matrix to FFT it. I do not have a good understanding of the command when it comes to raw data.

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