Tony,
I have tried the lyapunov type with passes=o, but it automatically reverts to passes=1 every time. What's the secret?
The lyapunov type won't work with passes=o because it doesn't use the correct variable. For most orbit type fractals each iteration determines a location on the complex plane. This location is stored in the complex variable 'new' and becomes in some predetermined fashion an input into the next iteration. Since the lyapunov type doesn't use the 'new' variable, I have added code to make the passes option revert to '1' if passes=o and fractype=lyapunov are selected at the same time. I will do something similar with the hypercomplex and quaternion types for the same reason. As you can see by trying them with the passes=o option, they don't generate an image. Might it be possible to slip the complex variable 'new' in such that passes=o generates an image with these fractal types? Yes, but that will take some study of the code. Jonathan