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From: Bruno Silva on 6 May 2010 04:50
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
From: Kevin J. McCann on 7 May 2010 06:24
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

From: Bruno Silva on 7 May 2010 06:24
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,
Bruno

On Thu, May 6, 2010 at 12:48 PM, Kevin J. McCann <Kevin.McCann(a)umbc.edu>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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