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Re: phase portraits


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.


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