cu)</code></th>
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<div class="block">Compute the number of non-zero values, which potentially 
 makes a full pass over the underlying blocks in the row range.</div>
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<td class="colFirst"><code>int</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#index(int)">index</a></span>&#8203;(int&nbsp;r)</code></th>
<td class="colLast">
<div class="block">Get the block index for a given row.</div>
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