span class="va">column_props</span><span class="op">[</span><span class="fl">3</span>, <span class="op">]</span></span>
<span><span class="va">n_total_by_class</span> <span class="op">&lt;-</span> <span class="fu"><a href="https://rdrr.io/r/base/apply.html" class="external-link">apply</a></span><span class="op">(</span><span class="va">partial_tables</span>, <span class="fl">3</span>, <span class="va">sum</span><span class="op">)</span></span>
<span><span class="va">n_total_by_class_survived_no</span> <span