ariation method</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">"hvar"</span>, plot <span class="op">=</span> <span class="cn">TRUE</span>, diagnose <span class="op">=</span> <span class="cn">TRUE</span><span class="op">)</span></span>
<span><span class="co">#&gt; lvec is set to c(8, 16, 32, 64).</span></span></code></pre></div>
<p><img src="fractal_intro_files/figure-html/