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MathGroup Archive 1999

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Re: PlotVectorField Package (easy question?)

  • To: mathgroup at smc.vnet.net
  • Subject: [mg15890] Re: [mg15838] PlotVectorField Package (easy question?)
  • From: "Kevin J. McCann" <kevinmccann at Home.com>
  • Date: Wed, 17 Feb 1999 23:33:38 -0500
  • Sender: owner-wri-mathgroup at wolfram.com

You are attempting (I think) to do a gradient field on two functions 2x^2 +
y and 3x-y.
I believe that PlotGradient Field will only work on a single scalar
function, e.g.

PlotGradientField[2  x^2 + y, {x,-10,10 }, {y,-10,10}]

Kevin

-----Original Message-----
From: Adam Price <ami at teleport.com>
To: mathgroup at smc.vnet.net
Subject: [mg15890] [mg15838] PlotVectorField Package (easy question?)


>I am running Mathematica 3.0 on a G3, and having trouble using
><<Graphics`PlotVectorField`
>
>******************************
>In[55]:=
>
><<Graphics`PlotField`
>
>In[56]:=
>    (PlotGradientField[{2  x^2 + y, 3 x - y}, {x,-10,10 }, {y,-10,10}]
>
>Out[56]=
>
>
aphics`PlotField`PlotVectorField[ 
>    {{4 x, 3}, {1, -1} , {x, -10, 10}, {y, -10, 10},
> {A long list of all the options}] 
>     
>
>******************    
>??PlotGradientField gives the help information from the package, but it
>still won't plot.  ??PlotVectorField returns: Global['PlotVectorField']
>
>I have tried clearing everything, running from inside PlotField.m, and
>even evaluating the example pages from the help manual. 
>PlotVectorField just won't run.  What am I doing wrong?
>
>-Adam
>
>




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