># cube counting</span></span>
<span><span class="fu"><a href="../reference/fd.html">fd</a></span><span class="op">(</span><span class="va">surf</span>, method <span class="op">=</span> <span class="st">"cubes"</span><span class="op">)</span></span>
<span><span class="co">#&gt; lvec is set to c(2, 4, 8, 16, 32, 64).</span></span>
<span><span class="co">#&gt; [1] 2</span></span></code></pre></div>
<p><code>hvar</code> and <code>sd</code> estimates are in the vicinity
of D=2.5. However, <code>area</code> and 