**petsc-3.13.6 2020-09-29**

# MatMPIAIJGetLocalMat

Creates a SeqAIJ from a MATMPIAIJ matrix by taking all its local rows and putting them into a sequential matrix with mlocal rows and n columns. Where mlocal is the row count obtained with MatGetLocalSize() and n is the global column count obtained with MatGetSize()
### Synopsis

#include "petscmat.h"
PetscErrorCode MatMPIAIJGetLocalMat(Mat A,MatReuse scall,Mat *A_loc)

Not Collective

### Input Parameters

### Output Parameter

**A_loc ** -the local sequential matrix generated

### Notes

When the communicator associated with A has size 1 and MAT_INITIAL_MATRIX is requested, the matrix returned is the diagonal part of A.
If MAT_REUSE_MATRIX is requested with comm size 1, MatCopy(Adiag,*A_loc,SAME_NONZERO_PATTERN) is called.
This means that one can preallocate the proper sequential matrix first and then call this routine with MAT_REUSE_MATRIX to safely
modify the values of the returned A_loc.

### See Also

MatGetOwnershipRange(), MatMPIAIJGetLocalMatCondensed()

### Level

developer

### Location

src/mat/impls/aij/mpi/mpiaij.c

Index of all Mat routines

Table of Contents for all manual pages

Index of all manual pages