uentially,
        column by column, so that AP( 1 ) contains a( 1, 1 ),
        AP( 2 ) and AP( 3 ) contain a( 2, 1 ) and a( 3, 1 )
        respectively, and so on.
        Note that when DIAG = &#39;U&#39; or &#39;u&#39;, the diagonal elements of
        A are not referenced, but are assumed to be unity.
</code></pre></div>

<p>X</p>
<div class="codehilite"><pre><span></span><code>       <span class="nv">X</span> <span class="nv">is</span> <span class="nv">REAL</span> <span class="nv">array</span>, <span 