sph.py 文件源码

def dspbessel(n, kr):
    """Derivative of spherical Bessel (first kind) of order n at kr

    Parameters
    ----------
    n : array_like
       Order
    kr: array_like
       Argument

    Returns
    -------
    J' : complex float
       Derivative of spherical Bessel
    """
    return _np.squeeze((n * spbessel(n - 1, kr) - (n + 1) * spbessel(n + 1, kr)) / (2 * n + 1))