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[Help-gsl] Solving ODE with negative step size

From: Capraro, MH, Mnr <address@hidden>
Subject: [Help-gsl] Solving ODE with negative step size
Date: Wed, 4 Apr 2012 15:56:04 +0200

Hi all

I'm in the process of coding an adaptive step-size Runge-Kutta method in C to 
solve some equations related to my research, but I'm seriously considering 
switching to GSL to avoid reinventing the wheel (and because my code is far 
from optimal). My main issue at the moment, looking at the example at, is 
that I am not sure how to adapt this to integrate BACK from an initial value. 
I.e, for a 2 dim. 1st order system with initial values given at a point away 
from the origin (on the positive real axis), how do I get the solver to take 
negative steps BACK to the origin? I would appreciate some help with this, an 
illustration in
terms of the example would be perfect (or a nudge in the right direction).  As 
far as I can determine I need to modify the call to the evolution routine in 
some way, but I find the documentation difficult to follow. 


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