Re: Manipulate / Space Phasor

• To: mathgroup at smc.vnet.net
• Subject: [mg92315] Re: Manipulate / Space Phasor
• From: "Fabian M. Uriarte" <fabian.uriarte at gmail.com>
• Date: Sat, 27 Sep 2008 22:19:09 -0400 (EDT)
• References: <gbl2ve\$lvl\$1@smc.vnet.net> <48DE15A9.3000703@gmail.com>

```Thank Szabolcs Horv=E1t for suggesting the vector arrow.  A bit big, but
hey, it conveys the idea quite well.  Thanks again.

On Sat, Sep 27, 2008 at 6:14 AM, Szabolcs Horv=E1t <szhorvat at gmail.com> wro=
te:
> 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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