class='fl'>0</span><span class='op'>)</span>,
  itemtype.effect <span class='op'>=</span> <span class='fu'><a href='https://rdrr.io/r/base/c.html'>c</a></span><span class='op'>(</span><span class='fl'>0</span>, <span class='fl'>0</span><span class='op'>)</span>,
  dif <span class='op'>=</span> <span class='fl'>0</span>,
  seed <span class='op'>=</span> <span class='cn'>NULL</span>
<span class='op'>)</span></pre>

    <h2 class="hasAnchor" id="arguments"><a class="anchor" href="#arguments"></a>Arguments</h2>