Posted by wonkuyn noh on May 16, 1998 at 12:14:28:

In Reply to: non-linear differential equations posted by Emmanuel DESVOIVRES on February 20, 1998 at 09:03:16:

: Hello,

: I need to solve a system of 4 non linear differential

: equations. The 4 equations look like this:

: dYi/dt=f(Yi) i=1,4

: the derivatives are evaluated numerically, by using only

: the Yi. I mean that t is not used to compute the derivatives.

: I use a first order method (Euler...) and I wonder if an

: higher order method (and subroutine) exists for that kind

: of equations.

: I tried the classical fourth order Runge-Kutta method, but it

: doesn't work, because the time t is not use for the

: evaluation of the derivatives.

: Could someone help me?

: thank you!