><code>op</code> - operator code</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>sparsity</dd>
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<h4>estim</h4>
<pre class="methodSignature">public abstract&nbsp;double&nbsp;estim&#8203;(<a href="../../runtime/matrix/data/MatrixBlock.html" title="class in org.apache.sysds.runtime.matrix.data">Matrix