<span class="nv">H</span><span class="o">*</span><span class="nv">x</span><span class="p">,</span><span class="w"></span>
</code></pre></div>

<p>where x is an n element vector and A is an n by n unit, or non-unit,
  upper or lower triangular matrix, supplied in packed form.</p>
<h2 id="options">OPTIONS</h2>
<p>UPLO</p>
<div class="codehilite"><pre><span></span><code>       UPLO is CHARACTER*1
        On entry, UPLO specifies whether the matrix is an upper or
        lower triangular matrix as follows:

   