#include "petscmat.h" PetscErrorCode MatColoringCreate(Mat m,MatColoring *mcptr)Collective on MatColoring
| comm | - MPI communicator |
| mcptr | - the new MatColoring context |
| -mat_coloring_type | - the type of coloring algorithm used | |
| -mat_coloring_maxcolors | - the maximum number of relevant colors, all nodes not in a color are in maxcolors+1 | |
| -mat_coloring_distance | - compute a distance 1,2,... coloring. | |
| -mat_coloring_view | - print information about the coloring and the produced index sets | |
| -mat_coloring_test | - debugging option that prints all coloring incompatibilities | |
| -mat_is_coloring_test | - debugging option that throws an error if MatColoringApply() generates an incorrect iscoloring |
Coloring of matrices can be computed directly from the sparse matrix nonzero structure via the MatColoring object or from the mesh from which the matrix comes from with DMCreateColoring(). In general using the mesh produces a more optimal coloring (fewer colors).
Some coloring types only support distance two colorings