      int&nbsp;nRow)</code></th>
<td class="colLast">
<div class="block">Combine the column groups A and B together.</div>
</td>
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<tr id="i1" class="rowColor">
<td class="colFirst"><code>static <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/util/List.html?is-external=true" title="class or interface in java.util" class="externalLink">List</a>&lt;<a href="../colgroup/AColGroup.html" title="class in org.apache.sysds.runtime.compress.colgroup">AColGroup</a>&gt;</code></td>
<th c