spanel_dfs.c File Reference

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

`#include "slu_sdefs.h"`
Include dependency graph for spanel_dfs.c:

## Functions

void | spanel_dfs (const int m, const int w, const int jcol, SuperMatrix *A, int *perm_r, int *nseg, float *dense, int *panel_lsub, int *segrep, int *repfnz, int_t *xprune, int *marker, int *parent, int_t *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 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

## spanel_dfs()

void spanel_dfs | ( | const int | m,
|  | const int | w,
|  | const int | jcol,
|  | SuperMatrix * | A,
|  | int * | perm_r,
|  | int * | nseg,
|  | float * | dense,
|  | int * | panel_lsub,
|  | int * | segrep,
|  | int * | repfnz,
|  | int_t * | xprune,
|  | int * | marker,
|  | int * | parent,
|  | int_t * | 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