petsc-3.9.0 2018-04-07
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PetscSFGetGraph

Get the graph specifying a parallel star forest

Synopsis

#include "petscsf.h" 
PetscErrorCode PetscSFGetGraph(PetscSF sf,PetscInt *nroots,PetscInt *nleaves,const PetscInt **ilocal,const PetscSFNode **iremote)
Not Collective

Input Arguments

sf -star forest

Output Arguments

nroots - number of root vertices on the current process (these are possible targets for other process to attach leaves)
nleaves - number of leaf vertices on the current process, each of these references a root on any process
ilocal - locations of leaves in leafdata buffers
iremote - remote locations of root vertices for each leaf on the current process

Notes

We are not currently requiring that the graph is set, thus returning nroots=-1 if it has not been set yet

See Also

PetscSFCreate(), PetscSFView(), PetscSFSetGraph()

Level

intermediate

Location

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

Examples

src/vec/is/sf/examples/tutorials/ex1f.F90.html
src/ts/examples/tutorials/ex11.c.html

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