Help in finding an implementation (algorith or code) of Chebyshev

[koky]

I'm doing a program that includes an implementation of chebyshev polynomial approximation (of the first order) in order to obtain the coefficients resulted from this approximation. Also I'm including the reverse process (Clenshaw's recurrance formula).

I'm still searching for an algorithm (c++) or a code to use in my program. I have 2 algorithms for this topic, the first one is not complete and the second one is in FORTRAN and is missing many routines (functions) used in it.

I'd be really gratefull if someone who knows an algorithm or code, or is familiar with this topic can help me.
koky

 

[xwb]

What routines is it missing?

 

[lgang]

Check the book, "Recipe in C", I remember I have read it somewhere. Or check books in digital signal processing area. Cheb Polynomial is also covered. I am not sure what you are looking for. Repost it if you like.