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# ISLocalToGlobalMappingCreateIS
Creates a mapping between a local (0 to n) ordering and a global parallel ordering. 
## Synopsis
```
#include "petscis.h"  
PetscErrorCode ISLocalToGlobalMappingCreateIS(IS is, ISLocalToGlobalMapping *mapping)
```
Not Collective


## Input Parameter

- ***is -*** index set containing the global numbers for each local number



## Output Parameter

- ***mapping -*** new mapping data structure





## Note
the block size of the `IS` determines the block size of the mapping


## See Also
 [](sec_scatter), `ISLocalToGlobalMapping`, `ISLocalToGlobalMappingDestroy()`, `ISLocalToGlobalMappingCreate()`, `ISLocalToGlobalMappingSetFromOptions()`

## Level
advanced

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


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