How to identify a tone within 0.25 Hz of several sinusoidal tones?

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Karla Ramirez
Karla Ramirez 2019-4-22
评论： Star Strider 2019-4-22
S = load('Student_7.dat');
a = S(:,1);
b = S(:,2);
[h,w] = freqz(b,a,1,.25)
--received a file containing 10 seconds of sampled data, which is file.
I don't think this code is correct, Please help.
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Walter Roberson
Walter Roberson 2019-4-22
Not fft: you want to use the Non-Uniform FFT from the File Exchange, unless the samples are strictly equal time interval.
Star Strider
Star Strider 2019-4-22
If they are not uniformly sampled, use the resample (link) function to resample them to uniform sampling intervals created with the linspace (link) function. Then do the fft on the resampled signal
It is easy to determine if they are uniformly sampled. If they are, this calculation:
dt_sd = std(diff(S(:,1)))
should be close to eps, on the order of 1E-15.

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