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# MatSTRUMPACKReordering
sparsity reducing ordering to be used in `MATSOLVERSTRUMPACK`` 
## Synopsis
```
typedef enum {
  MAT_STRUMPACK_NATURAL  = 0,
  MAT_STRUMPACK_METIS    = 1,
  MAT_STRUMPACK_PARMETIS = 2,
  MAT_STRUMPACK_SCOTCH   = 3,
  MAT_STRUMPACK_PTSCOTCH = 4,
  MAT_STRUMPACK_RCM      = 5
} MatSTRUMPACKReordering;
```

## Values

- ***`MAT_STRUMPACK_NATURAL` -*** use the current ordering
- ***`MAT_STRUMPACK_METIS` -*** use MeTis to compute an ordering
- ***`MAT_STRUMPACK_PARMETIS` -*** use ParMeTis to compute an ordering
- ***`MAT_STRUMPACK_SCOTCH` -*** use Scotch to compute an ordering
- ***`MAT_STRUMPACK_PTSCOTCH` -*** use parallel Scotch to compute an ordering
- ***`MAT_STRUMPACK_RCM` -*** use an RCM ordering





## Developer Note
Should be called `MatSTRUMPACKReorderingType`


## See Also
 `Mat`, `MATSOLVERSTRUMPACK`, `MatGetFactor()`, `MatSTRUMPACKSetHSSRelTol()`, `MatSTRUMPACKSetReordering()`

## Level
intermediate

## Location
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/include/petscmat.h.html#MatSTRUMPACKReordering">include/petscmat.h</A>

## Examples
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/ksp/ksp/tutorials/ex52.c.html">src/ksp/ksp/tutorials/ex52.c</A><BR>


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