state.</dd>
</dl></div>
<details class="source">
<summary>
<span>Expand source code</span>
</summary>
<pre><code class="python">def yulewalk_filter(X, sfreq, zi=None, ab=None, axis=-1):
    &#34;&#34;&#34;Yulewalk filter.

    Parameters
    ----------
    X : array, shape = (n_channels, n_samples)
        Data to filter.
    sfreq : float
        Sampling frequency.
    zi : array, shape=(n_channels, filter_order)
        Initial conditions.
    a, b : 2-tuple | None
        Coefficients of an IIR filter t