Dear Brian, have you ever been able to resolve this issue?
On 26.06.2007, at 20:28, Brian Powell wrote:
This email is in reference to what appears to be a notable change in performance of the rk4 integrator between older and newer versions of gsl. In particular, rk4 from version 1.5 and version 1.8. The particular test that I am performing is I am integrating a system of ODE's from some initial point to some final point, then reversing the integration. Clearly, one expects such evolutions to overlap. Surprisingly, they overlap quite well with the older version of rk4, but they do not match up well at all with the newer version. I'm trying to track down the cause of this, and, so far, can't seem to find a system specific reason for this.
Greetings, Jochen -- Einigkeit und Recht und Freiheit http://www.Jochen-Kuepper.de Liberté, Égalité, Fraternité GnuPG key: CC1B0B4D Sex, drugs and rock-n-roll
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