:orphan:
# PetscSFMerge
append/merge indices of `sfb` into `sfa`, with preference for `sfb` 
## Synopsis
```
#include "petscsf.h"   
PetscErrorCode PetscSFMerge(PetscSF sfa, PetscSF sfb, PetscSF *merged)
```
Collective


## Input Arguments

- ***sfa -*** default `PetscSF`
- ***sfb -*** additional edges to add/replace edges in sfa



## Output Arguments

- ***merged -*** new `PetscSF` with combined edges





## See Also
: `PetscSFCompose()`

## Level
intermediate

## Location
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/vec/is/sf/utils/sfutils.c.html#PetscSFMerge">src/vec/is/sf/utils/sfutils.c</A>


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