Module « scipy.signal »

Fonction lfiltic - module scipy.signal

Signature de la fonction lfiltic

def lfiltic(b, a, y, x=None) 

Description

lfiltic.__doc__

    Construct initial conditions for lfilter given input and output vectors.

    Given a linear filter (b, a) and initial conditions on the output `y`
    and the input `x`, return the initial conditions on the state vector zi
    which is used by `lfilter` to generate the output given the input.

    Parameters
    ----------
    b : array_like
        Linear filter term.
    a : array_like
        Linear filter term.
    y : array_like
        Initial conditions.

        If ``N = len(a) - 1``, then ``y = {y[-1], y[-2], ..., y[-N]}``.

        If `y` is too short, it is padded with zeros.
    x : array_like, optional
        Initial conditions.

        If ``M = len(b) - 1``, then ``x = {x[-1], x[-2], ..., x[-M]}``.

        If `x` is not given, its initial conditions are assumed zero.

        If `x` is too short, it is padded with zeros.

    Returns
    -------
    zi : ndarray
        The state vector ``zi = {z_0[-1], z_1[-1], ..., z_K-1[-1]}``,
        where ``K = max(M, N)``.

    See Also
    --------
    lfilter, lfilter_zi