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To obtain the same filter in MATLAB, you can use "
[b, a] = butter(2, [lowcut highcut]/(samplerate/2)))". This ;
y = filtfilt(b, a, x);
where lowcut and highcut are low and high cutoff frequencies (Hz), samplerate is the sampling frequency (Hz), x is the unfiltered data, and y is the filtered data.
This is correct despite the fact that MATLAB's documentation claims it should produce a 4th-order filter (it uses a different convention).
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