nmath: <code>plotdf</code>, <code>openplot_curves</code>
and <code>graph2d</code>. All those plotting functions are documented in
the Maxima Reference Manual.
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<p>A command used to create a 2d openmath plot, for example:
</p>
<pre class="example">plot2d(sin(x), [x, -%pi, %pi], [plot_format, openmath]);
</pre>
<p>creates a window with a menu bar with the following options:
</p>
<ul>
<li> <em>Close</em