Comp-sci/maths question about plotting?

[Zablorg]

Hi nerdpatrol, I was wondering if you could answer a question that I've been having trouble nailing down.

Is there a name for a kind of plotting algorithm where the position of the next point to be plotted is determined by probability weighted equations which take the last point?

so, there might be a 70 percent chance that the new x and y coordinates are given by x1 = x0 + 2y0 and y1 = 0.2y0 + 5, or something

[The Grim Squeaker]

(Linear) Regression.

[Darth Holbytlan]

It sounds like you're talking about an Iterated Function System, typically used to create fractal images.