# 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

MATSEQAIJ, MATAIJ, MatCreateAIJ()

beginner

## Location#

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

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