DMDANaturalToGlobalBegin

Maps values from a global vector in the “natural” ordering to a global vector in the PETSc DMDA grid ordering. Must be followed by DMDANaturalToGlobalEnd() to complete the exchange.

Synopsis

#include "petscdmda.h"   
PetscErrorCode DMDANaturalToGlobalBegin(DM da, Vec n, InsertMode mode, Vec g)

Neighbor-wise Collective

Input Parameters

• da - the DMDA context

• g - the global vector in a natural ordering, see DMDACreateNaturalVector()

• mode - one of INSERT_VALUES or ADD_VALUES

Output Parameter

• n - the values in the DMDA ordering

Note

The global and natural vectors used here need not be the same as those obtained from DMCreateGlobalVector() and DMDACreateNaturalVector(), BUT they must have the same parallel data layout; they could, for example, be obtained with VecDuplicate() from the DMDA originating vectors.

See Also

DMDA - Creating vectors for structured grids, DM, DMDA, DMDAGlobalToNaturalEnd(), DMDAGlobalToNaturalBegin(), DMLocalToGlobalBegin(), DMDACreate2d(), DMGlobalToLocalBegin(), DMGlobalToLocalEnd(), DMDACreateNaturalVector()

Level

advanced

Location

src/dm/impls/da/dagtol.c

Examples

src/ksp/ksp/tutorials/ex71.c
src/dm/tutorials/ex6.c

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