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MathGroup Archive 2000

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Re: Re: PlotVectorField

  • To: mathgroup at smc.vnet.net
  • Subject: [mg21933] Re: Re: [mg21886] PlotVectorField
  • From: "Carlos Castellanos" <caicaly at hotmail.com>
  • Date: Fri, 4 Feb 2000 02:55:00 -0500 (EST)
  • References: <200002032115.WAA19843@bologna.nettuno.it>
  • Sender: owner-wri-mathgroup at wolfram.com

Tiziano

You can check if the command PlotVectorField [ ] can recognize the option
you want to use by executing:

Options[PlotVectorField] // TableForm

As you can see PlotStyle, is not an option supported by that command, but
instead you have two options : (DefaultColor and ColorOutput) the first one
set the color Mathematica should use for the lines, points and every single thing
that appears in the graphic, the other (ColorOutput) gives Mathematica the source of
color it might use.
You may use too

FrameStyle -> GrayLevel[0]

in order to change the color of the frame and put it black, since using

DefaultColor -> RGBColor[0.996109, 0, 0]

draws everithing in red (+ - )

Here's is the command

PlotVectorField[{(2*x^2 - y^2)/(x^2 + y^2)^(5/2), (3*x*y)/(x^2 +
y^2)^(5/2)}*
0.01, {x, -1, 1}, {y, -1, 1}, PlotPoints -> 30, ScaleFactor -> None,
MaxArrowLength -> 0.5, ColorOutput -> RGBColor,
  DefaultColor -> RGBColor[0.996109, 0, 0], Frame -> True,
  FrameStyle -> GrayLevel[0]]

(NOTE: you don't need to use ColorOutput -> RGBColor, Mathematica will automatically
recognize the source...)

Best Regards

Carlos Castellanos
DR

----- Original Message -----
From: "enea" <enea at schio.nettuno.it>
To: mathgroup at smc.vnet.net
Subject: [mg21933] Re: Re: [mg21886] PlotVectorField


>
>
>
> On Thu, 3 Feb 2000, "Carlos Castellanos" wrote:
> > Date: Thu, 3 Feb 2000 02:14:25 -0200
> > To: "enea" <ruaro at astras.pd.astro.it>
> > From: "Carlos Castellanos" <caicaly at hotmail.com>
To: mathgroup at smc.vnet.net
> > Subject: [mg21933] Re: [mg21886] PlotVectorField
> >
> > Send the Plot Command, I mean the whole expression
>
>
> <<Graphics`PlotField`
>
> PlotVectorField[{(2*x^2 - y^2)/(x^2 + y^2)^(5/2), (3*x*y)/(x^2 +
y^2)^(5/2)}*
>    0.01, {x, -1, 1}, {y, -1, 1}, PlotPoints -> 30, ScaleFactor -> None,
>   MaxArrowLength -> 0.5, PlotStyle -> RGBColor[0.996109, 0, 0], Frame ->
True]
>
> The command
> PlotStyle -> RGBColor[0.996109, 0, 0]
>
> don't work and I've a black graphics
>
> Thanks
>  Tiziano
>


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