(default), 'wolfe'}, optional
        Which type of a line search to use to determine the step size in
        the direction given by the Jacobian approximation. Defaults to
        'armijo'.
    jac_options : dict, optional
        Options for the respective Jacobian approximation.

        alpha : float, optional
            Initial guess for the Jacobian is (-1/alpha).
        M : float, optional
            Number of previous vectors to retain. Defaults to 5.
        w0 : float, optional
            Regularization parameter for numerical stability.
            Compared to unity, good values of the order of 0.01.
    Nr