SRC/zcolumn_dfs.c File Reference

Performs a symbolic factorization. More...

#include "slu_zdefs.h"

Defines
#define	T2_SUPER
	What type of supernodes we want.
Functions
int	zcolumn_dfs (const int m, const int jcol, int *perm_r, int *nseg, int *lsub_col, int *segrep, int *repfnz, int *xprune, int *marker, int *parent, int *xplore, GlobalLU_t *Glu)

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Detailed Description

 -- SuperLU routine (version 3.0) --
 Univ. of California Berkeley, Xerox Palo Alto Research Center,
 and Lawrence Berkeley National Lab.
 October 15, 2003

 Copyright (c) 1994 by Xerox Corporation.  All rights reserved.

 THIS MATERIAL IS PROVIDED AS IS, WITH ABSOLUTELY NO WARRANTY
 EXPRESSED OR IMPLIED.  ANY USE IS AT YOUR OWN RISK.

 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.
 

---

Define Documentation

#define T2_SUPER

---

Function Documentation

int zcolumn_dfs	(	const int	m,
		const int	jcol,
		int *	perm_r,
		int *	nseg,
		int *	lsub_col,
		int *	segrep,
		int *	repfnz,
		int *	xprune,
		int *	marker,
		int *	parent,
		int *	xplore,
		GlobalLU_t *	Glu
	)

 Purpose
 =======
   ZCOLUMN_DFS performs a symbolic factorization on column jcol, and
   decide the supernode boundary.

   This routine does not use numeric values, but only use the RHS 
   row indices to start the dfs.

   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.

 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.

   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

 Return value
 ============
     0  success;
   > 0  number of bytes allocated when run out of space.