Returns
    -------
    der : ndarray
        Hermite series of the derivative.

    See Also
    --------
    hermint

    Notes
    -----
    In general, the result of differentiating a Hermite series does not
    resemble the same operation on a power series. Thus the result of this
    function may be "unintuitive," albeit correct; see Examples section
    below.

    Examples
    --------
    >>> from numpy.polynomial.hermite import hermder
    >>> hermder([ 1. ,  0.5,  0.5,  0.5])
    array([1., 2., 3.])
    >>> hermder([-0.5,  1./2.,  1./8.,  1./12.,  1./16.], m=2)
    array([1., 2., 3.])

    r