petsc-3.9.4 2018-09-11

DMCreateFieldDecomposition

Returns a list of IS objects defining a decomposition of a problem into subproblems corresponding to different fields: each IS contains the global indices of the dofs of the corresponding field. The optional list of DMs define the DM for each subproblem. Generalizes DMCreateFieldIS().

Synopsis

#include "petscdm.h"          
#include "petscdmlabel.h"     
#include "petscds.h"     
PetscErrorCode DMCreateFieldDecomposition(DM dm, PetscInt *len, char ***namelist, IS **islist, DM **dmlist)

Not collective

Input Parameter

dm -the DM object

Output Parameters

	len	- The number of subproblems in the field decomposition (or NULL if not requested)
	namelist	- The name for each field (or NULL if not requested)
	islist	- The global indices for each field (or NULL if not requested)
	dmlist	- The DMs for each field subproblem (or NULL, if not requested; if NULL is returned, no DMs are defined)

Notes

The user is responsible for freeing all requested arrays. In particular, every entry of names should be freed with PetscFree(), every entry of is should be destroyed with ISDestroy(), every entry of dm should be destroyed with DMDestroy(), and all of the arrays should be freed with PetscFree().

Level

intermediate

DMCreateFieldDecomposition

Synopsis

Input Parameter

Output Parameters

Notes

See Also

Level

Location

Examples

Implementations