span></span><code>       N is INTEGER
        On entry, N specifies the order of the matrix A.
        N must be at least zero.
</code></pre></div>

<p>AP</p>
<div class="codehilite"><pre><span></span><code>       AP is COMPLEX array, dimension at least
        ( ( n*( n + 1 ) )/2 ).
        Before entry with UPLO = &#39;U&#39; or &#39;u&#39;, the array AP must
        contain the upper triangular matrix packed sequentially,
        column by column, so that AP( 1 ) contains a( 1, 1 ),
        AP( 2 ) and A