Fresnel integral

Computes the Fresnel integral with complex argument "z"

This function computes the Fresnel integral "FresnelI(z)" with argument "z" either real or complex, and where FresnelI(z) = FresnelC(z) + i*FresnelS(z).

USAGE: [FresnelI] = FresnelI(z, tol)

INPUT PARAMETERS:
z = complex argument of Fresnel integral (vector).
tol = absolute tolerance to evaluate the integral using "quadl"(scalar). default=1.0e-4

REFERENCES:
[1] A. Erdelyi, Higher Transcendental Functions, Vol.2, McGraw-Hill (1953)
[2] M. Abramowitz and I.A. Stegun, Handbook of Mathematical Functions, New York, Dover Publications (1965)