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<title>SuperLU: SRC/ilu_dcolumn_dfs.c File Reference</title>
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<h1>SRC/ilu_dcolumn_dfs.c File Reference</h1>Performs a symbolic factorization. <a href="#_details">More...</a>
<p>
<code>#include "<a class="el" href="slu__ddefs_8h-source.html">slu_ddefs.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">int </td><td class="memItemRight" valign="bottom"><a class="el" href="ilu__dcolumn__dfs_8c.html#f164b7b553eed616e2ed95144698fe7a">ilu_dcolumn_dfs</a> (const int m, const int jcol, int *perm_r, int *nseg, int *lsub_col, int *segrep, int *repfnz, int *marker, int *parent, int *xplore, <a class="el" href="structGlobalLU__t.html">GlobalLU_t</a> *Glu)</td></tr>
</table>
<hr><a name="_details"></a><h2>Detailed Description</h2>
<pre>
-- SuperLU routine (version 4.0) --
Lawrence Berkeley National Laboratory
June 30, 2009
</pre> <hr><h2>Function Documentation</h2>
<a class="anchor" name="f164b7b553eed616e2ed95144698fe7a"></a><!-- doxytag: member="ilu_dcolumn_dfs.c::ilu_dcolumn_dfs" ref="f164b7b553eed616e2ed95144698fe7a" args="(const int m, const int jcol, int *perm_r, int *nseg, int *lsub_col, int *segrep, int *repfnz, int *marker, int *parent, int *xplore, GlobalLU_t *Glu)" -->
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<td class="memname">int ilu_dcolumn_dfs </td>
<td>(</td>
<td class="paramtype">const int </td>
<td class="paramname"> <em>m</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">const int </td>
<td class="paramname"> <em>jcol</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">int * </td>
<td class="paramname"> <em>lsub_col</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>
</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>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype">int * </td>
<td class="paramname"> <em>xplore</em>, </td>
</tr>
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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>
</tr>
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<td></td>
<td>)</td>
<td></td><td></td><td width="100%"></td>
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<div class="memdoc">
<p>
<pre>
Purpose
=======
ILU_DCOLUMN_DFS performs a symbolic factorization on column jcol, and
decide the supernode boundary.</pre><p>
<pre> This routine does not use numeric values, but only use the RHS
row indices to start the dfs.</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. The routine returns a list of such supernodal
representatives in topological order of the dfs that generates them.
The location of the first nonzero in each such supernodal segment
(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 --> A-row/col (0/1)
repfnz: SuperA-col --> PA-row
parent: SuperA-col --> SuperA-col
xplore: SuperA-col --> index to L-structure</pre><p>
<pre> Return value
============
0 success;
> 0 number of bytes allocated when run out of space.
</pre>
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