egment
   (supernodal entry location) is also returned.</pre><p>
<pre> Local parameters
 ================
   nseg: no of segments in current U[*,j]
   jsuper: jsuper=EMPTY if column j does not belong to the same
	supernode as j-1. Otherwise, jsuper=nsuper.</pre><p>
<pre>   marker2: A-row --&gt; A-row/col (0/1)
   repfnz: SuperA-col --&gt; PA-row
   parent: SuperA-col --&gt; SuperA-col
   xplore: SuperA-col --&gt; index to L-structure</pre><p>
<pre> Return value
 ============
     0  success;
   &gt; 0  numb