/NumPy 1.17

# numpy.polynomial.chebyshev.chebadd

`numpy.polynomial.chebyshev.chebadd(c1, c2)` [source]

Add one Chebyshev series to another.

Returns the sum of two Chebyshev series `c1` + `c2`. The arguments are sequences of coefficients ordered from lowest order term to highest, i.e., [1,2,3] represents the series `T_0 + 2*T_1 + 3*T_2`.

Parameters: `c1, c2 : array_like` 1-D arrays of Chebyshev series coefficients ordered from low to high. `out : ndarray` Array representing the Chebyshev series of their sum.

#### Notes

Unlike multiplication, division, etc., the sum of two Chebyshev series is a Chebyshev 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 import chebyshev as C
>>> c1 = (1,2,3)
>>> c2 = (3,2,1)
>>> C.chebadd(c1,c2)
array([4., 4., 4.])
```

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