non-linear differential equations

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Posted by Emmanuel DESVOIVRES on February 20, 1998 at 09:03:16:


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!

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