DASetGetMatrix

Sets the routine used by the DA to allocate a matrix.

#include "petscda.h"   
PetscErrorCode PETSCDM_DLLEXPORT DASetGetMatrix(DA da,PetscErrorCode (*f)(DA, MatType,Mat*))

Collective on DA

	da	- the DA object
	f	- the function that allocates the matrix for that specific DA

Notes: See DASetBlockFills() that provides a simple way to provide the nonzero structure for the diagonal and off-diagonal blocks of the matrix