title: C++ Bessel function for complex numbers
body: <p>I want to implement the Bessel functions of first and second kind<a href="http://en.wikipedia.org/wiki/Bessel_function#Bessel_functions_of_the_first_kind_%3a_J.CE.B1" rel="nofollow">Description of bessel functions</a> for complex numbers in C++. Now I am looking for possibilities to introduce them in my source code. Since math.h only contains bessel functions for real numbers, I would be interested in seeing any kind of possibility.</p>