# ISLocalToGlobalMappingConcatenate
Create a new mapping that concatenates a list of mappings 
## Synopsis
```
#include "petscis.h"  
PetscErrorCode ISLocalToGlobalMappingConcatenate(MPI_Comm comm, PetscInt n, const ISLocalToGlobalMapping ltogs[], ISLocalToGlobalMapping *ltogcat)
```
Not Collective


## Input Parameters

- ***comm -*** communicator for the new mapping, must contain the communicator of every mapping to concatenate
- ***n -*** number of mappings to concatenate
- ***ltogs -*** local to global mappings



## Output Parameter

- ***ltogcat -*** new mapping





## Note
This currently always returns a mapping with block size of 1


## Developer Note
If all the input mapping have the same block size we could easily handle that as a special case


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

## Level
advanced

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