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How to calculate the computational complexity of filtfilt low-pass filter?

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Kalasagarreddi Kottakota
评论： Kalasagarreddi Kottakota 2023-10-31
I have a signal 'x' of length N which I perform lowpass filtering with matlab filtfilt. a and b are filter coefficients.
Is it possible to calculate its complexity in terms of Big O like O(...)?
y = filtfilt(b,a,x)

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Bruno Luong
Bruno Luong 2023-10-30
filtfilt just do twice (forward + backward) the filter. In your case it is IIR, where the complexity is
O((length(a)+length(b))*N)
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