shubiaohewan 
July 18, 2013 11:03 
Help on chebyshev polynomials
Hi all,
I want to see the orthogonality of the chebyshev polynomials in Matlab.
The nodes I choose is the Chebyshev nodes, . i=1.....n
According to the approximation theory, I can have
Now, how can I numerically show that the orthogonality? What I did is
(1) I generate the chebyshev polynomials in Matlab, stored in p(:,i), i is the order 0....n
(2) sum(p(:,i).*p(:,j)), meaning that the componentwise sum of the ith order chebyshev and jth one.
But it turns out that some of the results work, some of them don't.
Did I do something wrong here? I didn't mention the weight function since for the chebyshev nodes, the weight function is constant pi/n. So at least, it should affect the orthogonality.
Any comments? Thanks.
