SRC/dpanel_dfs.c File Reference

Peforms a symbolic factorization on a panel of symbols. More...

#include "slu_ddefs.h"

Functions
void	dpanel_dfs (const int m, const int w, const int jcol, SuperMatrix *A, int *perm_r, int *nseg, double *dense, int *panel_lsub, int *segrep, int *repfnz, int *xprune, int *marker, int *parent, int *xplore, GlobalLU_t *Glu)

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Detailed Description

 -- SuperLU routine (version 2.0) --
 Univ. of California Berkeley, Xerox Palo Alto Research Center,
 and Lawrence Berkeley National Lab.
 November 15, 1997

 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.
 

---

Function Documentation

void dpanel_dfs	(	const int	m,
		const int	w,
		const int	jcol,
		SuperMatrix *	A,
		int *	perm_r,
		int *	nseg,
		double *	dense,
		int *	panel_lsub,
		int *	segrep,
		int *	repfnz,
		int *	xprune,
		int *	marker,
		int *	parent,
		int *	xplore,
		GlobalLU_t *	Glu
	)

 Purpose
 =======

   Performs a symbolic factorization on a panel of columns [jcol, jcol+w).

   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 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.

   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;

   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