DMCreateMatrix

Synopsis

#include "petscdm.h"          
#include "petscdmlabel.h"     
#include "petscds.h"     
PetscErrorCode  DMCreateMatrix(DM dm,Mat *mat)

Input Parameter

Output Parameter

Notes

By default it also sets the nonzero structure and puts in the zero entries. To prevent setting the nonzero pattern call DMSetMatrixPreallocateOnly()

For structured grid problems, when you call MatView() on this matrix it is displayed using the global natural ordering, NOT in the ordering used internally by PETSc.

For structured grid problems, in general it is easiest to use MatSetValuesStencil() or MatSetValuesLocal() to put values into the matrix because MatSetValues() requires the indices for the global numbering for DMDAs which is complicated.

See Also

Level

Location

Examples

Implementations