to
    high.

Returns
-------
out : ndarray
    Array representing the Hermite series of their sum.

See Also
--------
hermesub, hermemulx, hermemul, hermediv, hermepow

Notes
-----
Unlike multiplication, division, etc., the sum of two Hermite series
is a Hermite series (without having to "reproject" the result onto
the basis set) so addition, just like that of "standard" polynomials,
is simply "component-wise."

Examples
--------
>>> from numpy.polynomial.hermite_e import hermeadd
>>> hermeadd([1, 2, 3], [1, 2, 3, 4])
array([2.,  4.,  6.,  4.])

)