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Re: Manipulate, Opacity, slow down

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  • Subject: [mg99827] Re: Manipulate, Opacity, slow down
  • From: Alexei Boulbitch <Alexei.Boulbitch at>
  • Date: Fri, 15 May 2009 04:21:45 -0400 (EDT)

Hi, Janos,

Without the code it is not quite clear, why  the 2D parametric  plot is 
noticeably slowed down in your case.  I met such situations only in 3D 
cases. Probably your function is too heavy for whatever reason.
Anyway, if you need the result for a presentation (for what else?), you 
may be quite sutisfied with timing of the discrete Manipulate version, 
instead of the continuous one, like the following:

f[a_] := ParametricPlot[{Sin[a u], Cos[u/a]}, {u, 0, 4 Pi}]
Manipulate[f[a], {a, 1, 5, 0.5}]

If this is still too slow in your case, try the FlipView like below: 

tab = Table[
   ParametricPlot[{Sin[a u], Cos[u/a]}, {u, 0, 4 Pi}], {a, 1, 5, 0.5}];

This must be fast.


n May 12, 11:43 am, janos <janostothmeis... at> wrote:
> I wonder if you can give me some hints without a code.
> I have a program using Manipulate[ParametricPlot[f[a]]].
> 1. If I define outside the function f used in ParametricPlot, and then
> insert the function name into ParametricPlot, then the program slows
> down extremely compared to the version when the formula of the
> function is inserted.
> 2. If I add Opacity to the Directives, again the timing increases
> tremendously.
> If you think you could help seeing the (long) code I'll be ready to
> show it.
> Thank you,
> J=E1nos


Alexei Boulbitch, Dr., habil.
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