PetscSFCompose

Compose a new PetscSF by putting the second PetscSF under the first one in a top (roots) down (leaves) view

Synopsis

#include "petscsf.h" 
PetscErrorCode PetscSFCompose(PetscSF sfA, PetscSF sfB, PetscSF *sfBA)

Input Parameters

• sfA - The first PetscSF

• sfB - The second PetscSF

Output Parameter

• sfBA - The composite PetscSF

Notes

Currently, the two PetscSFs must be defined on congruent communicators and they must be true star forests, i.e. the same leaf is not connected with different roots.

sfA’s leaf space and sfB’s root space might be partially overlapped. The composition builds a graph with sfA’s roots and sfB’s leaves only when there is a path between them. Unconnected nodes (roots or leaves) are not in sfBA. Doing a PetscSFBcastBegin()/PetscSFBcastEnd() on the new PetscSF is equivalent to doing a PetscSFBcastBegin()/PetscSFBcastEnd() on sfA, then a PetscSFBcastBegin()/PetscSFBcastEnd() on sfB, on connected nodes.

See Also

PetscSF, PetscSFComposeInverse(), PetscSFGetGraph(), PetscSFSetGraph()

Level

developer

Location

src/vec/is/sf/interface/sf.c

Examples

src/ts/tutorials/ex30.c

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Index of all PetscSF routines
Table of Contents for all manual pages
Index of all manual pages