Numerical Integration — GSL 2.7 documentation
www.gnu.org › software › gslgsl_integration_fixed_type * gsl_integration_fixed_chebyshev ¶ This specifies Chebyshev type 1 quadrature integration. The parameters alpha and beta are ignored for this type. gsl_integration_fixed_type * gsl_integration_fixed_gegenbauer ¶ This specifies Gegenbauer quadrature integration. The parameter beta is ignored for this type.
Chebyshev Approximations — GSL 2.7 documentation
www.gnu.org › software › gslChebyshev Approximations. This chapter describes routines for computing Chebyshev approximations to univariate functions. A Chebyshev approximation is a truncation of the series , where the Chebyshev polynomials provide an orthogonal basis of polynomials on the interval with the weight function . The first few Chebyshev polynomials are, , , .