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# MatSetLocalToGlobalMapping
Sets a local-to-global numbering for use by the routine `MatSetValuesLocal()` to allow users to insert matrix entries using a local (per-processor) numbering.
## Synopsis
```
#include "petscmat.h"
PetscErrorCode MatSetLocalToGlobalMapping(Mat x, ISLocalToGlobalMapping rmapping, ISLocalToGlobalMapping cmapping)
```
Not Collective
## Input Parameters
- ***x -*** the matrix
- ***rmapping -*** row mapping created with `ISLocalToGlobalMappingCreate()` or `ISLocalToGlobalMappingCreateIS()`
- ***cmapping -*** column mapping
## Note
If the matrix is obtained with `DMCreateMatrix()` then this may already have been called on the matrix
## See Also
[](ch_matrices), `Mat`, `DM`, `DMCreateMatrix()`, `MatGetLocalToGlobalMapping()`, `MatAssemblyBegin()`, `MatAssemblyEnd()`, `MatSetValues()`, `MatSetValuesLocal()`, `MatGetValuesLocal()`
## Level
intermediate
## Location
src/mat/interface/matrix.c
## Examples
src/snes/tutorials/ex48.c
src/tao/bound/tutorials/plate2.c
src/tao/bound/tutorials/plate2f.F90
## Implementations
MatSetLocalToGlobalMapping_IS in src/mat/impls/is/matis.c
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