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NDSolve from negative to positive time

• To: mathgroup at smc.vnet.net
• Subject: [mg89103] NDSolve from negative to positive time
• From: Allen Robnett <alrobnett at alumni.princeton.edu>
• Date: Mon, 26 May 2008 01:27:52 -0400 (EDT)

The answer to my question may be trivial, but I have not found it. I am dealing with the orbits in a three-body problem. I have written equations which do a beautiful job of 3D plotting the results from t=0 to any positive time. The only boundary conditions available are at t=0. I am able to get the correct 3D plot for negative time if I reverse all of the velocities at t=0. I assume that I can then get a plot that combines the two into one plot from negative time to positive time. But this seems very "klutsy" and I believe that Mathematica must provide a sophisticated way to get the   results in a single operation. Any suggestions?

Allen Robnett