MatFDColoringView#

Views a finite difference coloring context.

Synopsis#

#include "petscmat.h" 
PetscErrorCode MatFDColoringView(MatFDColoring c, PetscViewer viewer)

Collective

Input Parameters#

c - the coloring context
viewer - visualization context

Notes#

The available visualization contexts include

PETSC_VIEWER_STDOUT_SELF - standard output (default)
PETSC_VIEWER_STDOUT_WORLD - synchronized standard output where only the first processor opens the file. All other processors send their data to the first processor to print.
PETSC_VIEWER_DRAW_WORLD - graphical display of nonzero structure

Since PETSc uses only a small number of basic colors (currently 33), if the coloring involves more than 33 then some seemingly identical colors are displayed making it look like an illegal coloring. This is just a graphical artifact.