Re: Manipulate, Opacity, slow down

*To*: mathgroup at smc.vnet.net*Subject*: [mg99827] Re: Manipulate, Opacity, slow down*From*: Alexei Boulbitch <Alexei.Boulbitch at iee.lu>*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}]; FlipView[tab] This must be fast. Alexei n 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 -- Alexei Boulbitch, Dr., habil. Senior Scientist IEE S.A. ZAE Weiergewan 11, rue Edmond Reuter L-5326 Contern Luxembourg Phone: +352 2454 2566 Fax: +352 2454 3566 Website: www.iee.lu This e-mail may contain trade secrets or privileged, undisclosed or otherwise confidential information. If you are not the intended recipient and have received this e-mail in error, you are hereby notified that any review, copying or distribution of it is strictly prohibited. Please inform us immediately and destroy the original transmittal from your system. Thank you for your co-operation.