etric median could converge in {i} iterations &#34;
              f&#34;with a tolerance of {tol}&#34;)


def polystab(a):
    &#34;&#34;&#34;Polynomial stabilization.

    POLYSTAB(A), where A is a vector of polynomial coefficients,
    stabilizes the polynomial with respect to the unit circle;
    roots whose magnitudes are greater than one are reflected
    inside the unit circle.

    Parameters
    ----------
    a : array
        The vector of polynomial coefficients.

    Returns
    -------
    b : 