Animate parametric plot of two lists?

• To: mathgroup at smc.vnet.net
• Subject: [mg101475] Animate parametric plot of two lists?
• From: Porscha Louise McRobbie <pmcrobbi at umich.edu>
• Date: Wed, 8 Jul 2009 07:11:05 -0400 (EDT)

```Hello,

When I have explicit formulas for two functions of time, it's simple
to animate the parametric plot of them by using ParametricPlot inside
Animate.

I'd like to create a similar animation now, but using two lists of
numbers. Apparently there is  no function such as ListParametricPlot.

Below a roundabout way I found (I want to show both a dashed line and
a point tracing out the curve in time). Is there a better way to do
this? I'd like to be able to include many more frames, and this method
seems inefficient.

Any suggestion/help is appreciated.

Porscha

(*Animate a parametric plot from two lists*)
In[1]:= f[t_] := Cos[t]
In[2]:= g[t_] := Sin[t]

In[27]:= list1 = Table[f[t], {t, 0, 2 Pi, .1}];
In[28]:= list2 = Table[g[t], {t, 0, 2 Pi, .1}];

In[29]:= n = Length[list1];
In[31]:= frame = ConstantArray[0.0, n];

In[32]:= Do[
frame[[j]] =
Show[ListLinePlot[plotdat[[1 ;; j]], PlotStyle -> {Red, Dashed},
PlotRange -> {{-1.2, 1.2}, {-1.2, 1.2}}],
ListPlot[plotdat[[1 ;; j]],
PlotRange -> {{-1.2, 1.2}, {-1.2, 1.2}},
PlotMarkers -> {Automatic, 12}]], {j, 1, n}]

In[33]:= ListAnimate[frame]

```

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