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Math Forum » Discussions » Software » comp.soft-sys.math.mathematica

Topic: phase portraits
Replies: 6   Last Post: Feb 5, 2011 5:45 AM

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sjoerd.c.devries@gmail.com

Posts: 893
Registered: 10/6/08
Re: phase portraits
Posted: Feb 4, 2011 6:58 AM
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On Feb 4, 7:44 am, James <icor...@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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