MatCreateGraph#
create a scalar matrix (that is a matrix with one vertex for each block vertex in the original matrix), for use in graph algorithms and possibly removes small values from the graph structure.
Synopsis#
#include "petscmat.h" 
PetscErrorCode MatCreateGraph(Mat A, PetscBool sym, PetscBool scale, PetscReal filter, PetscInt num_idx, PetscInt index[], Mat *graph)
Collective
Input Parameters#
- A - the matrix 
- sym - - PETSC_TRUEindicates that the graph should be symmetrized
- scale - - PETSC_TRUEindicates that the graph edge weights should be symmetrically scaled with the diagonal entry
- filter - filter value - < 0: does nothing; == 0: removes only 0.0 entries; otherwise: removes entries with abs(entries) <= value 
- num_idx - size of ‘index’ array 
- index - array of block indices to use for graph strength of connection weight 
Output Parameter#
- graph - the resulting graph 
See Also#
Level#
advanced
Location#
Index of all Mat routines
Table of Contents for all manual pages
Index of all manual pages