chebs

chebs() function chebs ( c::Array{Float64}  , n::Integer  , x::Real    ) Evaluation of Chebyshev series Purpose chebs evaluates the Chebyshev series by using Clenshaw algorithm. f(x) = c0/2 + ΣciTi(x) (i = 0 to n-1) (-1 <= x <= 1) Note that there is factor of 2 difference in the first coefficient c0 depending on the definition of the Chebyshev series. Returns Float64 The value of Chebyshev series. Parameters [in] c Numpy ndarray (1-dimensional, Float64, n) Coefficients of Chebyshev series. [in] n Argument n. (n >= 1) [in] x Argument x. Error handling If n <= 0, domain error (EDOM) occurs. Range error (ERANGE) may occur. Note If x < -1 or x > 1, this routine is much slower and recommended not to be used. Reference boost/math/special_functions