[pstricks] Searching for a numeric solution for coupled differential equation systems of order 2

Juergen Gilg gilg at acrotex.net
Thu May 24 22:21:06 CEST 2012

Dear PSTricks list,

is there anybody out there, knowing about how to generate a PS code for 
"Runge-Kutta 4" to solve a "coupled differential equation system of 
order 2"?

There is the need for such a code to animate a double-pendulum in real 
time, following the coupled differential equations with the variables 
(\varphi_1, \varphi_2) and their derivatives like:



Any help is appreciated!!!

Many thanks for every hint,


Jürgen Gilg
Austr. 59
70376 Stuttgart

tel   0711 59 27 88
email gilg at acrotex.net

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