r not A is unit
        triangular as follows:

           DIAG = &#39;U&#39; or &#39;u&#39;   A is assumed to be unit triangular.

           DIAG = &#39;N&#39; or &#39;n&#39;   A is not assumed to be unit
                               triangular.
</code></pre></div>

<p>N</p>
<div class="codehilite"><pre><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><