PETSc version 3.17.1

DMSetMatrixPreallocateOnly

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

Synopsis

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

Logically Collective on dm

Input Parameters

	dm	- the DM
	only	- PETSC_TRUE if only want preallocation

Options Database Keys

-dm_preallocate_only

- Only preallocate the matrix for DMCreateMatrix(), but do not fill it with zeros

Level

developer

Location

src/dm/interface/dm.c

Examples

src/ts/tutorials/ex50.c.html
src/tao/unconstrained/tutorials/spectraladjointassimilation.c.html

Index of all DM routines
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Index of all manual pages