cheb_eval Function

public function cheb_eval(n, x) result(res)

Evaluates a Chebyshev polynomial of degree n at x (-1 <= x <= 1).

Reference

Kopriva, D (2009) Implementing spectral methods for partial differential equations, Springer, p. 60 (Algorithm 21).

Arguments

Type	Intent	Optional	Attributes		Name
integer,	intent(in)			::	n
real(kind=rp),	intent(in)			::	x

Return Value real(kind=rp)