ssume the input only have one non zero per row, and that non zero is a 1.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>sb</code> - Sparse block to extract points from</dd>
<dd><code>rl</code> - row to start from</dd>
<dd><code>ru</code> - row to end at</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>The coordinates that contain values.</dd>
</dl>
</li>
</ul>
</li>
</ul>
</section>
</li>
</ul>
</div>
</div>
</main>
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