span class="n">A</span><span class="p">(:)]</span> <span class="p">;</span>
<span class="n">vl_plotframe</span><span class="p">(</span><span class="n">f</span><span class="p">)</span> <span class="p">;</span>
</pre></div>


<p>produces the plot</p>

<div class="figure">
 <img src="../demo/frame_affine.jpg"></img>
 <div class="caption">
  <span class="content">
    An oriented ellipse is specified as the affine transformation
    $(A,T)$ of the standard oriented frame shown above. Figure
    generated by <co