 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>This particular oriented frame is conventionally deemed to
be <em>standard</em> and, as shown in the code fragment above, it
corresponds to the identity affine transformation. Since this ellipse
is also a circle, the frame can equivalently be represented by an
oriented circle with unit radius and null orientatio