- convolve(x, y, mode='full')
- savitzky_golay_coefficients(n_left, n_right, degree, derivative=0, wraparound=True)
- Compute the convolution coefficients to be used for smoothing data by the
method of Savitzky and Golay .
n_left and n_right are the number of past and future data points used. The
total number of data points used is n_left + n_right + 1.
degree is the degree or order of the smoothing polynomial.
wraparound: if True then the coefficients are returned in "wraparound" order
i.e. point 0 is at index, 1 at index, etc. and point -1 is at index[-1],
point -2 at index[-2], etc.
..  A. Savitzky, M. J. E. Golay, Smoothing and Differentiation of
Data by Simplified Least Squares Procedures. Analytical
Chemistry, 1964, 36 (8), pp 1627-1639.
..  Numerical Recipes 3rd Edition: The Art of Scientific Computing
W.H. Press, S.A. Teukolsky, W.T. Vetterling, B.P. Flannery
Cambridge University Press ISBN-13: 9780521880688
- savitzky_golay_filter(x, y, half_window, degree, derivative=0)