ns of ret, otherwise use the column dimension of
                   ret.</dd>
<dd><code>k</code> - Parallelization degree</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>A new MatrixBlock or ret.</dd>
</dl>
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<h4>rexpandSingleRow</h4>
<pre class="methodSignature">public static&nbsp;int&nbsp;rexpandSingleRow&#8203;(int&nbsp;row,
                          