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# MATAIJPERM
"AIJPERM" - A matrix type to be used for sparse matrices. This matrix type is identical to `MATSEQAIJPERM` when constructed with a single process communicator,
and `MATMPIAIJPERM` otherwise.  As a result, for single process communicators,
`MatSeqAIJSetPreallocation()` is supported, and similarly `MatMPIAIJSetPreallocation()` is supported
for communicators controlling multiple processes.  It is recommended that you call both of
the above preallocation routines for simplicity.


## Options Database Key

- ***-mat_type aijperm -*** sets the matrix type to `MATAIJPERM`





## See Also
 [](ch_matrices), `Mat`, `MatCreateMPIAIJPERM()`, `MATSEQAIJPERM`, `MATMPIAIJPERM`, `MATSEQAIJ`, `MATMPIAIJ`, `MATSEQAIJMKL`, `MATMPIAIJMKL`, `MATSEQAIJSELL`, `MATMPIAIJSELL`

## Level
beginner

## Location
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/mat/impls/aij/mpi/aijperm/mpiaijperm.c.html#MATAIJPERM">src/mat/impls/aij/mpi/aijperm/mpiaijperm.c</A>


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


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