Fresnel_s

Definition:

\(S = fresnel\_s(x)\) evaluates an approximation to the Fresnel Integral

\[S(x)=\int_0^x\sin (\frac \pi 2t^2)dt\]

The function is based on Chebyshev expansions.

For more information please review the s20acc function in the NAG document.

Parameters:

x (input, double)

The argument x of the function.

s (output, double)

Approximation of the Fresnel Integral.