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Re: NDSolve backward in time

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  • Subject: [mg109599] Re: NDSolve backward in time
  • From: Bruno Silva <bfasilva at>
  • Date: Fri, 7 May 2010 06:30:35 -0400 (EDT)
  • References: <hrtvse$s6q$> <>

Hi Kevin,

Thanks for the tip (in fact I was misplacing the initial conditions at LH).
It's working.
I'm a bit far from QM scattering, working on Tokamak plasma transport model
(thank you for that too!).

Best wishes,

On Thu, May 6, 2010 at 12:48 PM, Kevin J. McCann <Kevin.McCann at>wrote:

> Hi Bruno,
> I use NDSolve in the "backwards" direction for quantum mechanical
> scattering. Just do NDSolve as usual, i.e. {t,-10,10}, for example, but
> specify the initial conditions at the right-hand end.
> I have a notebook on QM scattering I can send you if you are interested.
> Kevin
> Bruno Silva wrote:
>> Hi,
>> It is a common strategy to integrate an ode with time flowing in the
>> opposite direction, to get an idea of possible unstable equilibria.
>> Does anyone know how to ask NDSolve to integrate "backward" in time?
>> Thanks,
>> Bruno

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