I received an email requesting that the complex bessel function be implemented in Fractint. I have a bunch of complex analysis and numerical analysis books I am checking. I also have Numerical Recipes in C, but that code is copyrighted, and also has a poor reputation. Does anyone have either a clear formulation suitable for implementation, or even better, an implementation to contribute? If so, let me know. A Mac program has implemented it. I have emailed the author, but of course I don't know if he'll be interested in contributing his implementation. The web site is here: http://members.optusnet.com.au/~peterstone/parser.html It's hard to tell from these few images if the bessel function would be worth implementing or not. Let me know what you think. Tim