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, c2array_like

1-D arrays of Chebyshev series coefficients ordered from low to high.

Returns

outndarray

Array representing the Chebyshev series of their sum.

See also

chebsub, chebmulx, chebmul, chebdiv, chebpow

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.])