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Re: Manipulate / Space Phasor

  • To: mathgroup at smc.vnet.net
  • Subject: [mg92334] Re: Manipulate / Space Phasor
  • From: Szabolcs Horvát <szhorvat at gmail.com>
  • Date: Sat, 27 Sep 2008 22:22:38 -0400 (EDT)
  • Organization: University of Bergen
  • References: <gbl2ve$lvl$1@smc.vnet.net>

Fabian wrote:
> Dear Group-
> 
> In this plot:
> 
> Manipulate[
>  ParametricPlot3D[{Sin[u], Cos[u], u/10}, {u, 0, t}], {t, 1, 20}]
> 
> Is there a way a to show an Arrow from the origin to the tip of the
> curve at all instances of time t?
> 

arrow3D = Line[{{0, 0, 0}, #}] &

Manipulate[
  Show[ParametricPlot3D[{Sin[u], Cos[u], u/10}, {u, 0, t}],
   Graphics3D[arrow3D[{Sin[t], Cos[t], t/10}]], PlotRange -> All], {t,
   1, 20}]

Now all you have to do is define (or search Google for) a better 3D 
arrow than a line.  Or steal one from the VectorFieldPlots package (it's 
a bit ugly):

<< VectorFieldPlots`
arrow3D = VectorFieldPlots`Private`vector3D[{0, 0, 0}, #, True] &


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