:orphan:
# PetscSFGetLeafRanks
Get leaf ranks referencing roots on this process 
## Synopsis
```
#include "petscsf.h" 
PetscErrorCode PetscSFGetLeafRanks(PetscSF sf, PetscInt *niranks, const PetscMPIInt **iranks, const PetscInt **ioffset, const PetscInt **irootloc)
```
Not Collective


## Input Parameter

- ***sf -*** star forest



## Output Parameters

- ***niranks -*** number of leaf ranks referencing roots on this process
- ***iranks -*** [`niranks`] array of ranks
- ***ioffset -*** [`niranks`+1] offset in `irootloc` for each rank
- ***irootloc -*** [`ioffset`[`niranks`]] concatenated array holding local indices of roots referenced by each leaf rank





## See Also
 `PetscSF`, `PetscSFGetRootRanks()`

## Level
developer

## Location
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/vec/is/sf/interface/sf.c.html#PetscSFGetLeafRanks">src/vec/is/sf/interface/sf.c</A>

## Examples
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/vec/is/sf/tutorials/ex1f.F90.html">src/vec/is/sf/tutorials/ex1f.F90</A><BR>

## Implementations

<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/vec/is/sf/impls/basic/allgatherv/sfallgatherv.c.html#PetscSFGetLeafRanks_Allgatherv">PetscSFGetLeafRanks_Allgatherv in src/vec/is/sf/impls/basic/allgatherv/sfallgatherv.c</A><BR>
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/vec/is/sf/impls/basic/sfbasic.c.html#PetscSFGetLeafRanks_Basic">PetscSFGetLeafRanks_Basic in src/vec/is/sf/impls/basic/sfbasic.c</A><BR>


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[Edit on GitLab](https://gitlab.com/petsc/petsc/-/edit/release/src/vec/is/sf/interface/sf.c)


[Index of all PetscSF routines](index.md)  
[Table of Contents for all manual pages](/manualpages/index.md)  
[Index of all manual pages](/manualpages/singleindex.md)