"figures/plot3d"></div>
</p>
<p>The 3d plot has a menu very similar to that obtained with
<code>plot2d</code>, but with one additional option: <em>Rotate</em>. Normally,
if you click on the plot, it will not be enlarged, as the 2d
plots. Clicking on the left button, while dragging the mouse, will
rotate the plot, allowing to control two angles: azimuth and elevation.
<a name="IDX59"></a>
</p>
<p>The menu option <samp>`Zoom'</samp>, will change that default behavior, making
the mouse enlarge the plot, as in 