Dawson Erf Erfc Erfci Erfi Fresc Fress

Fress() Function Fress ( X As  Double, Optional Info As  Long  ) Fresnel integral S(x) Purpose This routine computes the Fresnel integral. S(x) = ∫sin(π/2 t^2) dt [0, x] Returns Double Fresnel integral S(x). Parameters [in] X Argument x. [out] Info (Optional) = 0: Successful exit. = 1: Floating point range error.