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MathGroup Archive 2007

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Re: Phase Portrait

  • To: mathgroup at
  • Subject: [mg76243] Re: Phase Portrait
  • From: Jens-Peer Kuska <kuska at>
  • Date: Fri, 18 May 2007 06:17:05 -0400 (EDT)
  • Organization: Uni Leipzig
  • References: <f2hck0$2fc$>
  • Reply-to: kuska at



ContourPlot[p^2/2 + Cos[x], {x, -Pi, Pi}, {p, -4, 4}]

draw the pahs portrait of a pendelum ? with a perfect
separatrix, in version 6.0 ??

And including 1.0 into the Contours option will do it in
version 5.2 also ??


herato wrote:
> Hi!
> I would like to plot a simple phase portrait of some standard equation
> such as the pendulum .
> How to do it?
> It is completely equivalent to plot sublevels of the Hamiltonian, but
> in this case Mathematica does not plot the separatrix.....
> Thanks a lot!!!!

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