Phase portrait of an undamped simple pendulum.
The diagram was plotted using with <a href="https://en.wikipedia.org/wiki/GNU_Octave" class="extiw" title="w:GNU Octave">GNU Octave</a> using <a href="https://en.wikipedia.org/wiki/gnuplot" class="extiw" title="w:gnuplot">gnuplot</a> backend and saved as a standalone LaTeX file. The PDF generated was then converted to SVG using pdf2svg. The octave source file is provided in the SVG version mentioned below.
Newer version by <a href="//commons.wikimedia.org/wiki/User:Krishnavedala" title="User:Krishnavedala">Krishnavedala</a><br>Older version by <a href="//commons.wikimedia.org/wiki/User:Deeptrivia" title="User:Deeptrivia">Deeptrivia</a>
2014-11-29
<span class="int-own-work" lang="en">Own work</span>