tps://rdrr.io/r/base/c.html" class="external-link">c</a></span><span class="op">(</span><span class="st">"#00000000"</span>, <span class="st">"#000000"</span><span class="op">)</span><span class="op">)</span></span></span>
<span class="r-err co"><span class="r-pr">#&gt;</span> <span class="error">Error:</span> object 'bn2' not found</span>
<span class="r-in"><span><span class="co"># with missing values filled in with zeros</span></span></span>
<span class="r-in"><span><span class="va">bn2</span><span class=