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!

- Re: non-linear differential equations
**wonkuyn noh***12:14:28 5/16/98*(0)