       Re: VectorColorFunction

• To: mathgroup at smc.vnet.net
• Subject: [mg124472] Re: VectorColorFunction
• From: Patrick Scheibe <pscheibe at trm.uni-leipzig.de>
• Date: Sat, 21 Jan 2012 05:12:27 -0500 (EST)
• Delivered-to: l-mathgroup@mail-archive0.wolfram.com
• References: <201201200655.BAA18272@smc.vnet.net>

```Hi,

maybe I misunderstood you, but the parameters which you can use in a
VectorColorFunction are {x,y,fx,fy,norm}. Just use fx and fy to
calculate your angle and make a color from it:

VectorPlot[{x, y}, {x, -3, 3}, {y, -3, 3}, VectorColorFunction ->
Function[{x, y, fx, fy, norm}, ColorData["BrightBands"][
Mod[ArcTan[fx, fy], 2*Pi]/(2*Pi)]],
VectorColorFunctionScaling -> False]

Cheers
Patrick

On Fri, 2012-01-20 at 01:55 -0500, Peter Rodenbach wrote:
> Hi experts,
>
> I want to plot via ListVectorPlot a Field of Vectors. I obtained the
> vectors from a physics experiment. The Norm of all vectors is very
> similar, and what is important is its direction!
>
> Therefore, what I want to do now is: give each vector a color with a
> different direction a different color, e.g., up to 0.5degree red, 0.5
> to 1 degree yellow, etc.
>
> The Problem: The norm of each vector is used as argument for the
> function that determines the color, according to the help
>
> "With the setting VectorColorFunction->func, the arguments supplied to
> func are as follows" ,...., x,y,Subscript[v, x],Subscript[v,
> y],Norm[{Subscript[v, x],Subscript[v, y]}]"
>
> Does anyone have an idea for a workaround?
>
> Thanks
>
> Peter
>

```

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