petsc-3.5.4 2015-05-23

DMSetMatrixPreallocateOnly

When DMCreateMatrix() is called the matrix will be properly preallocated but the nonzero structure and zero values will not be set.

#include "petscdm.h"     
PetscErrorCode DMSetMatrixPreallocateOnly(DM dm, PetscBool only)

Logically Collective on DMDA

	dm	- the DM
	only	- PETSC_TRUE if only want preallocation