 up and down)</dd>
<dd><code>ignore</code> - Ignore if the input contain values below zero that technically is incorrect input.</dd>
<dd><code>blen</code> - The block size to slice the output up into</dd>
<dd><code>outList</code> - The output indexedMatrixValues (a list to add all the output blocks to / modify)</dd>
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<h4>countNnzPerColumn</h4>
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