 member function <code>isS4()</code> <code>isNULL()</code>.</p>
<p>However, matrices and factor vectors can not be determined by only using the function <code>is&lt;T&gt;()</code> because they are vectors with values are set to specific attribute. To determine them, use <code>Rf_isMatrix()</code> function or the <code>Rf_isFactor()</code> function.</p>
<p>The code example below shows how to determine the type using <code>RObject</code>.</p>
<div class="sourceCode" id="cb70"><pre class="sourceCode cpp"><code