# ISGetNonlocalIS
Gather all nonlocal indices for this IS and present them as another sequential index set. 
## Synopsis
```
#include "petscis.h" 
PetscErrorCode ISGetNonlocalIS(IS is, IS *complement)
```
Collective on IS


## Input Parameter

- ***is -*** the index set



## Output Parameter

- ***complement -*** sequential IS with indices identical to the result of
ISGetNonlocalIndices()





## Notes
complement represents the result of ISGetNonlocalIndices as an IS.
Therefore scalability issues similar to ISGetNonlocalIndices apply.
The resulting IS must be restored using ISRestoreNonlocalIS().


## See Also
 `ISGetNonlocalIndices()`, `ISRestoreNonlocalIndices()`, `ISAllGather()`, `ISGetSize()`

## Level
intermediate

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


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


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