/NumPy 1.17

# numpy.polynomial.hermite_e.hermemul

`numpy.polynomial.hermite_e.hermemul(c1, c2)` [source]

Multiply one Hermite series by another.

Returns the product of two Hermite series `c1` * `c2`. The arguments are sequences of coefficients, from lowest order “term” to highest, e.g., [1,2,3] represents the series `P_0 + 2*P_1 + 3*P_2`.

Parameters: `c1, c2 : array_like` 1-D arrays of Hermite series coefficients ordered from low to high. `out : ndarray` Of Hermite series coefficients representing their product.

#### Notes

In general, the (polynomial) product of two C-series results in terms that are not in the Hermite polynomial basis set. Thus, to express the product as a Hermite series, it is necessary to “reproject” the product onto said basis set, which may produce “unintuitive” (but correct) results; see Examples section below.

#### Examples

```>>> from numpy.polynomial.hermite_e import hermemul
>>> hermemul([1, 2, 3], [0, 1, 2])
array([14.,  15.,  28.,   7.,   6.])
```

© 2005–2019 NumPy Developers
Licensed under the 3-clause BSD License.
https://docs.scipy.org/doc/numpy-1.17.0/reference/generated/numpy.polynomial.hermite_e.hermemul.html