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# ISLocalToGlobalMappingGetNodeInfo
Gets the neighbor information for each MPI rank 
## Synopsis
```
#include "petscis.h"  
PetscErrorCode ISLocalToGlobalMappingGetNodeInfo(ISLocalToGlobalMapping mapping, PetscInt *nnodes, PetscInt *count[], PetscInt **indices[])
```
Collective


## Input Parameter

- ***mapping -*** the mapping from local to global indexing



## Output Parameters

- ***nnodes -*** number of local nodes (same `ISLocalToGlobalMappingGetSize()`)
- ***count -*** number of neighboring processors per node
- ***indices -*** indices of processes sharing the node (sorted)





## Note
The user needs to call `ISLocalToGlobalMappingRestoreInfo()` when the data is no longer needed.


## See Also
 [](sec_scatter), `ISLocalToGlobalMappingDestroy()`, `ISLocalToGlobalMappingCreateIS()`, `ISLocalToGlobalMappingCreate()`,
`ISLocalToGlobalMappingGetInfo()`, `ISLocalToGlobalMappingRestoreNodeInfo()`

## Level
advanced

## Location
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/vec/is/utils/isltog.c.html#ISLocalToGlobalMappingGetNodeInfo">src/vec/is/utils/isltog.c</A>


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


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