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Re: Manipulate and ParametricPlot Control?

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  • Subject: [mg114351] Re: Manipulate and ParametricPlot Control?
  • From: David Annetts <david.annetts at>
  • Date: Thu, 2 Dec 2010 05:37:12 -0500 (EST)

Hi Anthony,

On 1/12/2010 15:11, AES wrote:
> This is a "what did I do wrong" post?  It's related to the
> "re-virginating" thread I started recently, but quite separate (and I
> think genuinely puzzling).
> As a simple test file, I created a notebook (which I don't have any
> more) containing the one cell
>     Manipulate[ Plot[x^a, {x,0,1}], {a,0,5}]
> (May have had a PlotRange option also; don't recall for sure.)
> Executed it; worked as expected.
> Decided to set an initial value for a; as best I recall (details are
> fuzzy), I edited the cell to change {a,0,5} to {{a,1},0,5}  (that's what
> I intended to do, anyway).
> When I re-executed the cell, I got a live Manipulate that displayed a
> ***two-dimensional*** (2D) Control -- something I had never seen before,
> but which looked exactly like the one I more recently found in the
> ParametricPlot example in the Manipulate Help.
> Exercising this Manipulate displayed **two** x^a curves, with values
> corresponding to the H and V axes of the 2D Control.  Functioned fine;
> no error msgs at any time.
I can't say for sure what went wrong in your case.

I can say that when I repeat the steps you list above, I get completely 
expected results.


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