></div>
    <div id="see-also">
    <h2>See also</h2>
    <div class="dont-index"><p><code><a href="jacobian.html">jacobian()</a></code>, <code><a href="der.html">der()</a></code></p></div>
    </div>

    <div id="ref-examples">
    <h2>Examples</h2>
    <div class="sourceCode"><pre class="sourceCode r"><code><span class="r-in"><span></span></span>
<span class="r-in"><span><span class="kw">if</span> <span class="op">(</span><span class="fu"><a href="has_sympy.html">has_sympy</a></span><span class="op">(</s