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.
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.
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.”
>>> from numpy.polynomial import chebyshev as C >>> c1 = (1,2,3) >>> c2 = (3,2,1) >>> C.chebadd(c1,c2) array([ 4., 4., 4.])