ntNonZeros(int,int,int,int)">countNonZeros</a></code>&nbsp;in class&nbsp;<code><a href="DenseBlock.html" title="class in org.apache.sysds.runtime.data">DenseBlock</a></code></dd>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>rl</code> - row lower index</dd>
<dd><code>ru</code> - row upper index (exclusive)</dd>
<dd><code>cl</code> - column lower index</dd>
<dd><code>cu</code> - column upper index (exclusive)</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>number of non-zeros</dd