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# MATMPIAIJ

MATMPIAIJ = “mpiaij” - A matrix type to be used for parallel sparse matrices.

## Options Database Keys

- -mat_type mpiaij - sets the matrix type to `MATMPIAIJ` during a call to `MatSetFromOptions()`

## Notes

`MatSetValues()` may be called for this matrix type with a `NULL` argument for the numerical values, in this case the values associated with the rows and columns one passes in are set to zero in the matrix

`MatSetOptions`(,`MAT_STRUCTURE_ONLY`,`PETSC_TRUE`) may be called for this matrix type. In this no space is allocated for the nonzero entries and any entries passed with `MatSetValues()` are ignored

## See Also

Matrices, `Mat`, `MATSEQAIJ`, `MATAIJ`, `MatCreateAIJ()`

## Level

beginner

## Location

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

## Examples

src/ksp/ksp/tutorials/ex54.c
src/ksp/ksp/tutorials/ex54f.F90
src/ksp/ksp/tutorials/ex19.c
src/snes/tutorials/ex70.c

Index of all Mat routines
Table of Contents for all manual pages
Index of all manual pages