Re: Manipulate, Opacity, slow down

*To*: mathgroup at smc.vnet.net*Subject*: [mg99752] Re: Manipulate, Opacity, slow down*From*: "Sjoerd C. de Vries" <sjoerd.c.devries at gmail.com>*Date*: Wed, 13 May 2009 05:07:44 -0400 (EDT)*References*: <gubgcj$9t3$1@smc.vnet.net>

Janos, I don't see much difference between Manipulate[ ParametricPlot[{Sin[a u], Cos[ u/a]}, {u, 0, 4 Pi}], {a, 1, 5}] and f[a_] := ParametricPlot[{Sin[a u], Cos[ u/a]}, {u, 0, 4 Pi}] Manipulate[f[a], {a, 1, 5}] What is it precisely you did? Cheers -- Sjoerd On May 12, 11:43 am, janos <janostothmeis... at gmail.com> 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