# MatCreateSeqCSRPERM

Creates a sparse matrix of type SEQCSRPERM. This type inherits from AIJ, but calculates some additional permutation information that is used to allow better vectorization of some operations. At the cost of increased storage, the AIJ formatted matrix can be copied to a format in which pieces of the matrix are stored in ELLPACK format, allowing the vectorized matrix multiply routine to use stride-1 memory accesses. As with the AIJ type, it is important to preallocate matrix storage in order to get good assembly performance.

### Synopsis

    PetscErrorCode PETSCMAT_DLLEXPORT MatCreateSeqCSRPERM(MPI_Comm comm,PetscInt m,PetscInt n,PetscInt nz,const PetscInt nnz[],Mat *A)

Collective on MPI_Comm

### Input Parameters

| comm | - MPI communicator, set to PETSC_COMM_SELF
| m | - number of rows
| n | - number of columns
| nz | - number of nonzeros per row (same for all rows)
| nnz | - array containing the number of nonzeros in the various rows (possibly different for each row) or PETSC_NULL

### Output Parameter

A -the matrix

### Notes

If nnz is given then nz is ignored

### Keywords

matrix, cray, sparse, parallel

### See Also

MatCreate(), MatCreateMPICSRPERM(), MatSetValues()

Level:intermediate
Location: src/mat/impls/aij/seq/csrperm/csrperm.c
Index of all Mat routines
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Index of all manual pages