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_TRUE indicates that the graph should be symmetrized
scale - PETSC_TRUE indicates 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

Level#

advanced

Location#

src/mat/interface/matrix.c

Index of all Mat routines
Table of Contents for all manual pages
Index of all manual pages