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# MatCreateMPIAIJSumSeqAIJ
Creates a `MATMPIAIJ` matrix by adding sequential matrices from each processor 
## Synopsis
```
#include "petscmat.h" 
PetscErrorCode MatCreateMPIAIJSumSeqAIJ(MPI_Comm comm, Mat seqmat, PetscInt m, PetscInt n, MatReuse scall, Mat *mpimat)
```
Collective


## Input Parameters

- ***comm -*** the communicators the parallel matrix will live on
- ***seqmat -*** the input sequential matrices
- ***m -*** number of local rows (or `PETSC_DECIDE`)
- ***n -*** number of local columns (or `PETSC_DECIDE`)
- ***scall -*** either `MAT_INITIAL_MATRIX` or `MAT_REUSE_MATRIX`



## Output Parameter

- ***mpimat -*** the parallel matrix generated





## Note
The dimensions of the sequential matrix in each processor MUST be the same.
The input seqmat is included into the container "Mat_Merge_SeqsToMPI", and will be
destroyed when mpimat is destroyed. Call `PetscObjectQuery()` to access seqmat.


## See Also
 [](ch_matrices), `Mat`, `MatCreateAIJ()`

## Level
advanced

## Location
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/mat/impls/aij/mpi/mpiaij.c.html#MatCreateMPIAIJSumSeqAIJ">src/mat/impls/aij/mpi/mpiaij.c</A>


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


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