File:Liouville.gif
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Summary[edit]
| Description |
English: Representation of Liouville's theorem for a simple pendulum.
If we take an ensemble of initial conditions and follow their evolution in phase-space, the total volume (area in this case) enclosing the points remains the same, although its shape can change. |
| Date | |
| Source | https://twitter.com/j_bertolotti/status/1034041906395852800 |
| Author | Jacopo Bertolotti |
| Permission (Reusing this file) |
https://twitter.com/j_bertolotti/status/1030470604418428929 |
Mathematica 11.0 code[edit]
np = 1000;
sols = Table[
NDSolve[{\[Theta]''[t] + Sin[\[Theta][t]] == 0, \[Theta]'[0] ==
0 + RandomReal[{-0.1, 0.1}], \[Theta][0] == \[Pi]/4 +
RandomReal[{-0.1, 0.1}]}, \[Theta], {t, 0, 100}], {np}];
plots = Table[
Graphics[{Point[
Table[Evaluate[{\[Theta][\[Tau]], \[Theta]'[\[Tau]]} /.
sols[[j]] ][[1]], {j, 1, np, 1}]]},
PlotRange -> {{-1, 1}, {-1, 1}}, AspectRatio -> 1, Axes -> False,
Frame -> True,
FrameLabel -> {"\[Theta]",
"\!\(\*OverscriptBox[\(\[Theta]\), \(.\)]\)"}],
{\[Tau], 0, 100, 0.1}];
Licensing[edit]
I, the copyright holder of this work, hereby publish it under the following license:
 
|
This file is made available under the Creative Commons CC0 1.0 Universal Public Domain Dedication. |
| The person who associated a work with this deed has dedicated the work to the public domain by waiving all of their rights to the work worldwide under copyright law, including all related and neighboring rights, to the extent allowed by law. You can copy, modify, distribute and perform the work, even for commercial purposes, all without asking permission.
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This file, which was originally posted to
https://twitter.com/j_bertolotti/status/1034041906395852800, was reviewed on 19 October 2018 by reviewer Ronhjones, who confirmed that it was available there under the stated license on that date.
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 11:48, 27 August 2018 | | 360 × 346 (3.61 MB) | Berto (talk | contribs) | User created page with UploadWizard |
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