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Re: phase portraits

  • To: mathgroup at
  • Subject: [mg116201] Re: phase portraits
  • From: "Sjoerd C. de Vries" <sjoerd.c.devries at>
  • Date: Fri, 4 Feb 2011 06:58:42 -0500 (EST)
  • References: <iig77m$rlk$>

On Feb 4, 7:44 am, James <icor... at> wrote:
> Hi,
> By far the nicest function in Mathematica to use for phase portraits is StreamPlot.  I believe that was a V7 feature.  For example, take:
> dx=x^2+2xy+y
> dy=2x-3y^2
> then:
> StreamPlot[{x^2+2xy+y,2x-3y^2},{x,-5,5},{y,-5,5}]
> will draw a nice phase portrait.

It will draw a nice portrait if you put a space between the x and y.

Cheers -- Sjoerd

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