Services & Resources / Wolfram Forums
-----
 /
MathGroup Archive
2002
*January
*February
*March
*April
*May
*June
*July
*August
*September
*October
*November
*December
*Archive Index
*Ask about this page
*Print this page
*Give us feedback
*Sign up for the Wolfram Insider

MathGroup Archive 2002

[Date Index] [Thread Index] [Author Index]

Search the Archive

RE: lissajous

  • To: mathgroup at smc.vnet.net
  • Subject: [mg37152] RE: [mg37133] lissajous
  • From: "David Park" <djmp at earthlink.net>
  • Date: Sun, 13 Oct 2002 05:56:42 -0400 (EDT)
  • Sender: owner-wri-mathgroup at wolfram.com

Steve,

Increase the PlotPoints.

ParametricPlot[{Sin[t], Sin[2t]}, {t, 0, 1000Pi}, PlotPoints -> 2000];

But, generally one wouldn't want to make the t domain greater than required
to plot the complete figure, in this case 0 to 2 Pi.

David Park
djmp at earthlink.net
http://home.earthlink.net/~djmp/

From: Steve Story [mailto:sbstory at unity.ncsu.edu]
To: mathgroup at smc.vnet.net


When using Parametric Plot to make closed Lissajous curves, it's best not to
take the parameter too far. for instance the code
ParametricPlot[{Sin[t], Sin[2t]}, {t, 0, 10Pi}]

looks much the same if you go to 20Pi or 30 Pi. But if you go too far, say,
1000Pi, the curve will stray so much that it can appear, deceptively, to be
an open Lissajous curve, filling the rectangle. I don't understand how it's
doing this. I assume the reason has to do with machine precision, but can
anyone tell me in a little detail what's happening here?

thanks,
--
_______________

 Steve Story
 Polymer Research Group
 411B Cox
 North Carolina State University
 1-919-515-8147

 _______________





  • Prev by Date: Re: Newbie mathematica question
  • Next by Date: Re: ParametricPlot Question
  • Previous by thread: lissajous
  • Next by thread: XML and the DTDs and etc.