def lanthoc(b3, b5, b7):
    """
    Leaf Anthocyanid Content (Wulf and Stuhler, 2015).

    .. math:: LAnthoC = b7/(b3 - b5)

    :param b3: Green.
    :type b3: numpy.ndarray or float
    :param b5: Red-edge 1.
    :type b5: numpy.ndarray or float
    :param b7: Red-edge 3.
    :type b7: numpy.ndarray or float

    :returns LAnthoC: Index value

    .. Tip::

        Wulf, H.; Stuhler, S. 2015. Sentinel-2: Land Cover, \
        Preliminary User Feedback on Sentinel-2A Data. \
        in: Proceedings of the Sentinel-2A Expert Users \
        Technical Meeting, Frascati, Italy, 29-30 September 2015.
    """

    LAnthoC = b7/(b3 - b5)
    return LAnthoC