Signal Toolkit - cheb

Function File: cheb (n, x)

Returns the value of the nth-order Chebyshev polynomial calculated at the point x. The Chebyshev polynomials are defined by the equations:

           / cos(n acos(x),    |x| <= 1
   Tn(x) = |
           \ cosh(n acosh(x),  |x| > 1
 

If x is a vector, the output is a vector of the same size, where each element is calculated as y(i) = Tn(x(i)).