alaguerre alegendre chebs chebt chebtd chebu gegenbauer gegenbauerd gegenbauerd1 hermite jacobi jacobid jacobid1 jacobid2 laguerre legendre legendred sharmonic sharmonic_sub sharmonici sharmonicr

chebs() double chebs ( double  c[], size_t  n, double  x  ) 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 The value of Chebyshev series. Parameters [in] c[] Array c[lc] (lc >= 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