<span class="op">=</span> <span class="st">"NULL"</span>, 
               within <span class="op">=</span> <span class="st">"NULL"</span>,
               dv <span class="op">=</span> <span class="st">"NULL"</span>, 
               type <span class="op">=</span> <span class="fl">3</span>,
               es <span class="op">=</span> <span class="st">"NULL"</span><span class="op">)</span> 

<span class="va">factorial_output</span> <span class="op">&lt;-</span> <span class="cn">NULL</span></code></pre></div>
<p