At Thu, 24 Aug 2006 21:24:58 +0200,
Marco Maggi wrote:
> and then recomputing with GSL step function rk2
> control function 'y' eps_abs = eps_rel = 0.001,

Those are large tolerances -- they are applied to each step, so the
global error is O(Nsteps * tolerance).  Also rk2 is the least accurate
method, try one of the others, e.g. rk4 at least.

-- 
Brian Gough

Network Theory Ltd,
Publishing the GSL Manual - http://www.network-theory.co.uk/gsl/manual/


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