*-- Structure returned by the symbolic factorization routine
Memory is allocated during parallel symbolic factorization
symbfact_dist, and freed after dist_symbLU routine.
(xlsub,lsub): lsub[*] contains the compressed subscript of
rectangular supernodes; xlsub[j] points to the starting
location of the j-th column in lsub[*]. Note that xlsub
is indexed by column.
Storage: row subscripts
(xusub,usub): lsub[*] contains the compressed subscript of
rectangular supernodes; xusub[j] points to the starting
location of the j-th row in usub[*]. Note that xusub
is indexed by rows.
Storage: column subscripts
(xsup_beg_loc,xsup_end_loc, supno_loc) describes mapping between
supernode and column, information local to each processor:
xsup_beg_loc[s] is the leading column of the local s-th supernode.
xsup_end_loc[s] is the last column of the local s-th supernode.
supno[i] is the supernode no to which column i belongs;
1.9.4