PETSc version 3.15.5
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# MatCreateMPIMatConcatenateSeqMat

Creates a single large PETSc matrix by concatenating sequential matrices from each processor

### Synopsis

    #include "petscmat.h"
    PetscErrorCode MatCreateMPIMatConcatenateSeqMat(MPI_Comm comm,Mat seqmat,PetscInt n,MatReuse reuse,Mat *mpimat)

Collective

### Input Parameters

| comm | - the communicators the parallel matrix will live on
| seqmat | - the input sequential matrices
| n | - number of local columns (or PETSC_DECIDE)
| reuse | - either MAT_INITIAL_MATRIX or MAT_REUSE_MATRIX

### Output Parameter

| mpimat | - the parallel matrix generated

### Notes

The number of columns of the matrix in EACH processor MUST be the same.

### Level

advanced

### Location

src/mat/interface/matrix.c

### Implementations

MatCreateMPIMatConcatenateSeqMat_MPIAIJ in src/mat/impls/aij/mpi/mpiaij.c
MatCreateMPIMatConcatenateSeqMat_SeqAIJ in src/mat/impls/aij/seq/aij.c
MatCreateMPIMatConcatenateSeqMat_MPIBAIJ in src/mat/impls/baij/mpi/mpibaij.c
MatCreateMPIMatConcatenateSeqMat_SeqBAIJ in src/mat/impls/baij/seq/baij.c
MatCreateMPIMatConcatenateSeqMat_MPIDense in src/mat/impls/dense/mpi/mpidense.c
MatCreateMPIMatConcatenateSeqMat_SeqDense in src/mat/impls/dense/seq/dense.c
MatCreateMPIMatConcatenateSeqMat_MPISBAIJ in src/mat/impls/sbaij/mpi/mpisbaij.c
MatCreateMPIMatConcatenateSeqMat_SeqSBAIJ in src/mat/impls/sbaij/seq/sbaij.c
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