# MatMPIAdjToSeqRankZero
Converts an parallel `MATMPIADJ` matrix to complete `MATMPIADJ` on rank zero (needed by sequential partitioner) 
## Synopsis
```
#include "petscmat.h" 
PetscErrorCode MatMPIAdjToSeqRankZero(Mat A, Mat *B)
```
Logically Collective


## Input Parameter

- ***A -*** the matrix



## Output Parameter

- ***B -*** the same matrix on rank zero, not set on other ranks





## Note
This routine has the advantage on systems with multiple ranks per node since only one copy of the matrix
is stored on the first node, instead of the number of ranks copies. This can allow partitioning much larger
parallel graph sequentially.


## See Also
 `MATMPIADJ`, `MatCreate()`, `MatCreateMPIAdj()`, `MatSetValues()`, `MatMPIAdjToSeq()`

## Level
intermediate

## Location
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/mat/impls/adj/mpi/mpiadj.c.html#MatMPIAdjToSeqRankZero">src/mat/impls/adj/mpi/mpiadj.c</A>

## Implementations

<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/mat/impls/adj/mpi/mpiadj.c.html#MatMPIAdjToSeqRankZero_MPIAdj">MatMPIAdjToSeqRankZero_MPIAdj in src/mat/impls/adj/mpi/mpiadj.c</A><BR>


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[Edit on GitLab](https://gitlab.com/petsc/petsc/-/edit/release/src/mat/impls/adj/mpi/mpiadj.c)


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