# SRC/ccolumn_dfs.c File Reference

Performs a symbolic factorization. More...

`#include "slu_cdefs.h"`

## Defines
#define | T2_SUPER
| What type of supernodes we want.
## Functions
int | ccolumn_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

     -- 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 ccolumn_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
     =======
       CCOLUMN_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.