DAGetColoring

Gets the coloring required for computing the Jacobian via finite differences on a function defined using a stencil on the DA.

Synopsis

#include "petscda.h"     
#include "petscmat.h"    
int DAGetColoring(DA da,ISColoringType ctype,ISColoring *coloring)
Collective on DA

Input Parameter

da - the distributed array
ctype - IS_COLORING_LOCAL or IS_COLORING_GHOSTED

Output Parameters

coloring -matrix coloring for use in computing Jacobians (or PETSC_NULL if not needed)

Notes: These compute the graph coloring of the graph of A^{T}A. The coloring used for efficient (parallel or thread based) triangular solves etc is NOT yet available.

See Also

ISColoringView(), ISColoringGetIS(), MatFDColoringCreate(), ISColoringType, ISColoring

Level:advanced
Location:
src/dm/da/utils/fdda.c
Index of all DA routines
Table of Contents for all manual pages
Index of all manual pages

Examples

src/snes/examples/tutorials/ex5.c.html
src/snes/examples/tutorials/ex14.c.html
src/snes/examples/tutorials/ex24.c.html
src/snes/examples/tutorials/ex26.c.html
src/snes/examples/tutorials/ex5f.F.html
src/ts/examples/tutorials/ex7.c.html