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<h3><a href="http://reference.wolfram.com/mathematica/ref/LowerTriangularize.html">LowerTriangularize</a></h3>
<ul>
    <li>LowerTriangularize[<em>m</em>] gives a matrix in which all but the lower triangular elements of <em>m</em> are
        replaced with zeros. 
    <li>LowerTriangularize[<em>m</em>,<em>k</em>] replaces with zeros only the elements above the
        <em>k</em><sup>th</sup> subdiagonal of <em>m</em>. 
</ul><p><b>Attributes:</b> Protected</p><p><b>Symbol has no options.</b></p>