Re: "particle" sliding along a curve

• To: mathgroup at smc.vnet.net
• Subject: [mg70535] Re: "particle" sliding along a curve
• From: dimmechan at yahoo.com
• Date: Thu, 19 Oct 2006 03:21:45 -0400 (EDT)
• References: <eh4pd9\$8j8\$1@smc.vnet.net>

```Here I provide you one example of how you can work.

It is based on David Park's solution to one old post of mine
regarding delta sequences.

The advice that follows are also from him and they appeard in
private communication

(THANKS DAVID!!!)

Needs["Graphics`"]

Do[Plot[x^2, {x, -10, 10}, Frame -> {True, True, False, False},
FrameTicks -> {Range[-10, 10, 2.5], Range[0, 100, 20]},
PlotRange -> {{-10.001, 10.001}, {-2., 100.2}}, Axes -> False,
PlotLabel -> StringJoin["an animation", "\n--------"],
FrameLabel -> {"x", "\!\(x\^2\)"}, TextStyle -> {FontFamily ->
"Times", FontSize -> 14},
Epilog -> {{Hue[(i + 4)/13], Text[StyleForm["watch the particle\n
as it moves \nit changes color", FontWeight -> "Bold",
FontSlant -> "Italic", FontSize -> 12], {i, i + 50}]}, {Hue[(i
+ 4)/13], PointSize[0.02], Point[{i, i^2}]}},
ImageSize -> 600], {i, -5, 5, 0.1}]
SelectionMove[EvaluationNotebook[], All,
GeneratedCell]*FrontEndTokenExecute["OpenCloseGroup"]; Pause[0.5];
FrontEndExecute[{FrontEnd`SelectionAnimate[200, AnimationDisplayTime ->
0.1, AnimationDirection -> ForwardBackward]}]

In the Animate statement I have added commands that select the
generated frames, close them up and start the animation.

In viewing an animation like this it is useful to know that you can use
the keyboard to step through the animation.This is often the best way
to view an animation.1) The up/down arrow keys will allow you to
advance one frame at a time.2) The right/left arrow keys will put in
animation into the forward or backward direction.3) The number keys
will control the speed of the animation.4)'p' will pause and restart
the animation.5)'c' will restart the animation in the forward-backward
mode.

Front End
I highly recomend you

"The Beginner's Guide To Mathematica, Version 4.0" by J. Glynn & T.
Gray
(Campridge University Press 2000).

Regards
Dimitris

```

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