Share 'Runge-Kutta Method'

Hi I've been reading about the Runge-kutta method to numerically solve diferential ecuations, I understand the concept, although my maths are pretty rusty, but I dont know how I can implement this in Vb.Net. I've checked codes in VB and other languages like Java, or C#, but each time they use runge-kutta they just call a runge-kutaa function, and I cant access it. So basically my question is ho…