.0 and end with
        1.0.
    M : array
        Magnitude breakpoints for the filter such that PLOT(F,M) would show a
        plot of the desired frequency response.

    References
    ----------
    .. [1] B. Friedlander and B. Porat, &#34;The Modified Yule-Walker Method of
           ARMA Spectral Estimation,&#34; IEEE Transactions on Aerospace
           Electronic Systems, Vol. AES-20, No. 2, pp. 158-173, March 1984.

    Examples
    --------
    Design an 8th-order lowpass filter and overplot the 