PetscSFComposeInverse

Compose a new PetscSF by putting the inverse of the second PetscSF under the first one

Synopsis

#include "petscsf.h" 
PetscErrorCode PetscSFComposeInverse(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. Even more, all roots of the second PetscSF must have a degree of 1, i.e., no roots have more than one leaf connected.

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

See Also

PetscSF, PetscSFCompose(), PetscSFGetGraph(), PetscSFSetGraph(), PetscSFCreateInverseSF()

Level

developer

Location

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

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