MathGroup Archive 2002

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inverse square law attraction

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  • Subject: [mg34884] inverse square law attraction
  • From: "Dick Boardman" <boardman at>
  • Date: Tue, 11 Jun 2002 05:01:02 -0400 (EDT)
  • Sender: owner-wri-mathgroup at

I have a question I would be pleased if someone would answer.

I am studying planetary motion under the inverse square law attraction.

I use NDSolve to find the numerical solution to


And get a very satisfactory ellipse. However, I would like to check the hodograph
( a parametric plot of x'[t] and y'[t]
against time. NDSolve must have calculated values for x'[t] and y'[t] but I
 cannot find them. Where are they please?


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