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 on da

Input Parameters#

  • da - the distributed array context

  • g - the global vector in a natural ordering

  • mode - one of INSERT_VALUES or ADD_VALUES

Output Parameter#

  • l - the values in the DMDA ordering

Notes#

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#

DM, DMDA, DMDAGlobalToNaturalEnd(), DMDAGlobalToNaturalBegin(), DMLocalToGlobalBegin(), DMDACreate2d(), DMGlobalToLocalBegin(), DMGlobalToLocalEnd(), DMDACreateNaturalVector()

Level#

advanced

Location#

src/dm/impls/da/dagtol.c

Examples#

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


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