Chebyshev polynomials, built-in / OctaveForge functions

[edA-qa mort-ora-y]

I've created two functions, one to generate the Chebyshev polynomials 
(with the symbolics library) and one to calculate an approximation 
polynomial for a given function.  My work is at the link below:

http://wiki.octave.org/wiki.pl?ChebyshevPolynomialApproximation

My question is how much of this is actually already provided by the 
standard functions and by the OctaveForge symbolics package?  There are 
a few cheb* functions, but I didn't really understand what they were doing.

Can somebody check what I've done, and maybe say how I can use the 
internal functions to accomplish the same thing?  (or if anybody notices 
an error, please let me know -- I do actually need to use this function :)

--
edA-qa mort-ora-y
Idea Architect
http://disemia.com/



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