rsionadded:: 1.3.0

    References
    ----------
    .. [1] M. Fiedler, " A note on companion matrices", Linear Algebra and its
        Applications, 2003, :doi:`10.1016/S0024-3795(03)00548-2`

    Examples
    --------
    >>> import numpy as np
    >>> from scipy.linalg import fiedler_companion, eigvals
    >>> p = np.poly(np.arange(1, 9, 2))  # [1., -16., 86., -176., 105.]
    >>> fc = fiedler_companion(p)
    >>> fc
    array([[  16.,  -86.,    1.,    0.],
           [   1.,    0.,    0.,    0.],
           [   0.,  176.,    0., -105.],
           [   0.,    1.,    0.,    0.]])
    >>> eigvals(fc)
    array([7.+0.j, 5.+0.j, 3.+0.j, 1.+0.j])

    r-