petsc-3.14.6 2021-03-30
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DMCompositeGetGlobalISs

Gets the index sets for each composed object

Synopsis

#include "petscdmcomposite.h"  
PetscErrorCode  DMCompositeGetGlobalISs(DM dm,IS *is[])
Collective on dm

Input Parameter

dm - the packer object

Output Parameters

is - the array of index sets

Notes

The is entries should be destroyed with ISDestroy(), the is array should be freed with PetscFree()

These could be used to extract a subset of vector entries for a "multi-physics" preconditioner

Use DMCompositeGetLocalISs() for index sets in the packed local numbering, and DMCompositeGetISLocalToGlobalMappings() for to map local sub-DM (including ghost) indices to packed global indices.

Fortran Notes

The output argument 'is' must be an allocated array of sufficient length, which can be learned using DMCompositeGetNumberDM().

See Also

DMDestroy(), DMCompositeAddDM(), DMCreateGlobalVector(),
DMCompositeGather(), DMCompositeCreate(), DMCompositeGetAccess(), DMCompositeScatter(), DMCompositeGetLocalVectors(), DMCompositeRestoreLocalVectors(),DMCompositeGetEntries()

Level

advanced

Location

src/dm/impls/composite/pack.c

Examples

src/snes/tutorials/ex28.c.html
src/snes/tutorials/ex73f90t.F90.html

Index of all DM routines
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Index of all manual pages