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<title>SuperLU: SRC/zpanel_dfs.c File Reference</title>
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<h1>SRC/zpanel_dfs.c File Reference</h1>Peforms a symbolic factorization on a panel of symbols. <a href="#_details">More...</a>
<p>
<code>#include "<a class="el" href="slu__zdefs_8h-source.html">slu_zdefs.h</a>"</code><br>
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<tr><td colspan="2"><br><h2>Functions</h2></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="zpanel__dfs_8c.html#2dfc62f0d77e7b112075276b06542f87">zpanel_dfs</a> (const int m, const int w, const int jcol, <a class="el" href="structSuperMatrix.html">SuperMatrix</a> *<a class="el" href="ilu__zdrop__row_8c.html#c900805a486cbb8489e3c176ed6e0d8e">A</a>, int *perm_r, int *nseg, <a class="el" href="structdoublecomplex.html">doublecomplex</a> *dense, int *panel_lsub, int *segrep, int *repfnz, int *xprune, int *marker, int *parent, int *xplore, <a class="el" href="structGlobalLU__t.html">GlobalLU_t</a> *Glu)</td></tr>
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<hr><a name="_details"></a><h2>Detailed Description</h2>
<pre>
-- SuperLU routine (version 2.0) --
Univ. of California Berkeley, Xerox Palo Alto Research Center,
and Lawrence Berkeley National Lab.
November 15, 1997</pre><p>
<pre> Copyright (c) 1994 by Xerox Corporation. All rights reserved.</pre><p>
<pre> THIS MATERIAL IS PROVIDED AS IS, WITH ABSOLUTELY NO WARRANTY
EXPRESSED OR IMPLIED. ANY USE IS AT YOUR OWN RISK.</pre><p>
<pre> Permission is hereby granted to use or copy this program for any
purpose, provided the above notices are retained on all copies.
Permission to modify the code and to distribute modified code is
granted, provided the above notices are retained, and a notice that
the code was modified is included with the above copyright notice.
</pre> <hr><h2>Function Documentation</h2>
<a class="anchor" name="2dfc62f0d77e7b112075276b06542f87"></a><!-- doxytag: member="zpanel_dfs.c::zpanel_dfs" ref="2dfc62f0d77e7b112075276b06542f87" args="(const int m, const int w, const int jcol, SuperMatrix *A, int *perm_r, int *nseg, doublecomplex *dense, int *panel_lsub, int *segrep, int *repfnz, int *xprune, int *marker, int *parent, int *xplore, GlobalLU_t *Glu)" -->
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<td class="memname">void zpanel_dfs </td>
<td>(</td>
<td class="paramtype">const int </td>
<td class="paramname"> <em>m</em>, </td>
</tr>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype">const int </td>
<td class="paramname"> <em>w</em>, </td>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype">const int </td>
<td class="paramname"> <em>jcol</em>, </td>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="structSuperMatrix.html">SuperMatrix</a> * </td>
<td class="paramname"> <em>A</em>, </td>
</tr>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype">int * </td>
<td class="paramname"> <em>perm_r</em>, </td>
</tr>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype">int * </td>
<td class="paramname"> <em>nseg</em>, </td>
</tr>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="structdoublecomplex.html">doublecomplex</a> * </td>
<td class="paramname"> <em>dense</em>, </td>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype">int * </td>
<td class="paramname"> <em>panel_lsub</em>, </td>
</tr>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype">int * </td>
<td class="paramname"> <em>segrep</em>, </td>
</tr>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype">int * </td>
<td class="paramname"> <em>repfnz</em>, </td>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype">int * </td>
<td class="paramname"> <em>xprune</em>, </td>
</tr>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype">int * </td>
<td class="paramname"> <em>marker</em>, </td>
</tr>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype">int * </td>
<td class="paramname"> <em>parent</em>, </td>
</tr>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype">int * </td>
<td class="paramname"> <em>xplore</em>, </td>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="structGlobalLU__t.html">GlobalLU_t</a> * </td>
<td class="paramname"> <em>Glu</em></td><td> </td>
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<td></td>
<td>)</td>
<td></td><td></td><td width="100%"></td>
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<p>
<pre>
Purpose
=======</pre><p>
<pre> Performs a symbolic factorization on a panel of columns [jcol, jcol+w).</pre><p>
<pre> A supernode representative is the last column of a supernode.
The nonzeros in U[*,j] are segments that end at supernodal
representatives.</pre><p>
<pre> The routine returns one list of the supernodal representatives
in topological order of the dfs that generates them. This list is
a superset of the topological order of each individual column within
the panel.
The location of the first nonzero in each supernodal segment
(supernodal entry location) is also returned. Each column has a
separate list for this purpose.</pre><p>
<pre> Two marker arrays are used for dfs:
marker[i] == jj, if i was visited during dfs of current column jj;
marker1[i] >= jcol, if i was visited by earlier columns in this panel;</pre><p>
<pre> marker: A-row --> A-row/col (0/1)
repfnz: SuperA-col --> PA-row
parent: SuperA-col --> SuperA-col
xplore: SuperA-col --> index to L-structure
</pre>
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