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# MatOrderingRegister
Adds a new sparse matrix ordering to the matrix package. 
## Synopsis
```
#include "petscmat.h" 
PetscErrorCode MatOrderingRegister(const char sname[], PetscErrorCode (*function)(Mat, MatOrderingType, IS *, IS *))
```
Not Collective


## Input Parameters

- ***sname -*** name of ordering (for example `MATORDERINGND`)
- ***function -*** function pointer that creates the ordering





## Sample usage
```none
   MatOrderingRegister("my_order", MyOrder);
```


Then, your partitioner can be chosen with the procedural interface via
```none
MatOrderingSetType(part, "my_order)
```
or at runtime via the option
```none
-pc_factor_mat_ordering_type my_order
```


## See Also
 `MatOrderingRegisterAll()`, `MatGetOrdering()`

## Level
developer

## Location
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/mat/order/sorder.c.html#MatOrderingRegister">src/mat/order/sorder.c</A>


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[Edit on GitLab](https://gitlab.com/petsc/petsc/-/edit/release/src/mat/order/sorder.c)


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