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Build the Savitzky-Golay derivative filter (Savitzky-Golay, 1964).
bDrvFilt(nDrv, tstep, winL = 9)The number of derivatives to be computed.
Time sampling.
The local window length to be used for computing the derivatives [1].
[1] Savitzky, A.; Golay, M.J.E., Smoothing and Differentiation of Data by Simplified Least Squares Procedures. Analytical Chemistry 36 (8), 1627-1639, 1964.