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Re: Symplectic integration and Interpolating function

  • To: mathgroup at
  • Subject: [mg45562] Re: Symplectic integration and Interpolating function
  • From: "Jens-Peer Kuska" <kuska at informatik.uni-leipzig-de>
  • Date: Wed, 14 Jan 2004 01:26:15 -0500 (EST)
  • Organization: Uni Leipzig
  • References: <bu0do8$an9$>
  • Sender: owner-wri-mathgroup at


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from this package.


"Guibout" <guibout at> schrieb im Newsbeitrag
news:bu0do8$an9$1 at
> Hi,
> I am using symplectic integrators to integrate a set of ode. One
> advantage of these integrators is that some properties are exactly
> preserved at the vertices. Therefore, it may be of interest to look at
> the values of the functions at the vertices. My question is the following:
> How do I find the vertices? NDSolve returns only an interpolating
> functions and some symplectic integrators have variable time steps, so
> even if I set the starting step size, I don't have any information on
> the next steps.
> Thanks
> Vincent

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