|void||ilu_spanel_dfs (const int m, const int w, const int jcol, SuperMatrix *A, int *perm_r, int *nseg, float *dense, float *amax, int *panel_lsub, int *segrep, int *repfnz, int *marker, int *parent, int *xplore, GlobalLU_t *Glu)|
-- SuperLU routine (version 4.0) -- Lawrence Berkeley National Laboratory June 30, 2009
|void ilu_spanel_dfs||(||const int||m,|
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