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Re: NDSolve limits

  • To: mathgroup at smc.vnet.net
  • Subject: [mg89097] Re: NDSolve limits
  • From: Szabolcs <szhorvat at gmail.com>
  • Date: Sun, 25 May 2008 06:27:13 -0400 (EDT)
  • References: <g1avpe$fdh$1@smc.vnet.net>

On May 25, 9:08 am, alrobnett <alrobn... at alumni.princeton.edu> wrote:
> I am working on a three body orbit problem. My equations have resulted
> in a beautiful 3D graph of the orbits, but only in one direction from
> t=0. (I have boundary conditions only for t=0). I can get the orbits
> for negative time by reversing all of the velocities, and I could
> combine the results to get a graph from negative time to positive
> time. Alternatively, I could use the results from the negative time
> calculations to become initial conditions for a new calculation, but
> these both seem like "klutsy" bandaids for the problem. Any
> suggestions?
>

I'm not sure I understand your question.  Maybe the following example
will be helpful:

NDSolve[{f''[x] + f[x] == 0, f[0] == 0, f'[0] == 1}, f, {x, -10,=
 10}]

Note that the boundary of the solution domain does not need to be the
same as the point where the initial condition is given.


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