petsc-3.12.5 2020-03-29

MatFDColoringSetFunction

Sets the function to use for computing the Jacobian.

#include "petscmat.h" 
PetscErrorCode  MatFDColoringSetFunction(MatFDColoring matfd,PetscErrorCode (*f)(void),void *fctx)

Logically Collective on MatFDColoring

	coloring	- the coloring context
	f	- the function
	fctx	- the optional user-defined function context

For SNES: PetscErrorCode (*f)(SNES,Vec,Vec,void*) If not using SNES: PetscErrorCode (*f)(void *dummy,Vec,Vec,void*) and dummy is ignored

This function is usually used automatically by SNES (when one uses SNESSetJacobian() with the argument SNESComputeJacobianDefaultColor()) and only needs to be used by someone computing a matrix via coloring directly by calling MatFDColoringApply()

In Fortran you must call MatFDColoringSetFunction() for a coloring object to be used without SNES or within the SNES solvers.

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