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Re: phase portraits

  • To: mathgroup at smc.vnet.net
  • Subject: [mg116201] Re: phase portraits
  • From: "Sjoerd C. de Vries" <sjoerd.c.devries at gmail.com>
  • Date: Fri, 4 Feb 2011 06:58:42 -0500 (EST)
  • References: <iig77m$rlk$1@smc.vnet.net>

On Feb 4, 7:44 am, James <icor... at hotmail.com> 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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