scolumn_dfs.c File Reference

Performs a symbolic factorization. More...

#include "slu_sdefs.h"

Include dependency graph for scolumn_dfs.c:

Macros
#define	T2_SUPER
	What type of supernodes we want. More...

Functions
int	scolumn_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)

Detailed Description

Copyright (c) 2003, The Regents of the University of California, through Lawrence Berkeley National Laboratory (subject to receipt of any required approvals from U.S. Dept. of Energy)

All rights reserved.

The source code is distributed under BSD license, see the file License.txt at the top-level directory.

– 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.

Macro Definition Documentation

#define T2_SUPER

Function Documentation

int scolumn_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

  SCOLUMN_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.

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