The equation I'm trying to animate.
I originally thought of using Blender 2.8 and using a python script. See original question:
Then realized that animation nodes has an expression node that may make it easier to animate and allow the changing of the expressions without knowing how to code python. Video Tutorial
I can create part of the expression but I'm not sure how to get the
Xn+1, Yn+1 values to work with the expressions node.
I've attached a blend file with a working parametric Epitrochoid equation.
I'm just not sure how to get it to work with the
Xn+1 and Yn+1 values
I'm using Blender 2.8 in Ubuntu 18.04 running Animation Nodes 2.1.4