File:Wave opposite-group-phase-velocity.gif

Wave_opposite-group-phase-velocity.gif(250 × 154 pixels, file size: 354 KB, MIME type: image/gif, looped, 50 frames, 4.0 s)


English: Animated Plot of a wave with phase and group velocities in opposite directions.

Own work;

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This diagram was created with Mathematica
Author Geek3

Source Code

Mathematica Logo.svg
This diagram was created with Mathematica
  (5/8 - 3/8 * Cos[2 Pi (x - t)]) * Cos[2 Pi (10*x + 4*t)],
  {x, 0, 1}, PlotRange -> {-1, 1}, PlotStyle -> Thick, 
  PerformanceGoal -> "Quality" , ImageSize -> 250],
  {t, 0, 1 - 1/50, 1/50}]

File -> Save Selection As... -> wave_opposite-group-phase-velocity.gif

Bash commands for postprocessing (bash, ImageMagick, gifsicle):

$ convert wave_opposite-group-phase-velocity.gif -crop 268x192 +repage wave.png
$ for i in wave-*.png; do convert $i -crop 250x154+9+0 +repage $i; done
$ convert wave-?.png wave-??.png  wave_opposite-group-phase-velocity.gif
$ rm wave-*.png
$ gifsicle -b --delay 8 --comment "" wave_opposite-group-phase-velocity.gif


I, the copyright holder of this work, hereby publish it under the following licenses:
GNU head Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.2 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license is included in the section entitled GNU Free Documentation License.
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current22:42, 2 April 2011Thumbnail for version as of 22:42, 2 April 2011250 × 154 (354 KB)Geek3self created file
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