petsc-3.7.3 2016-07-24
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# MatRARt

Creates the matrix product C = R * A * R^T

### Synopsis

    #include "petscmat.h"
    PetscErrorCode MatRARt(Mat A,Mat R,MatReuse scall,PetscReal fill,Mat *C)

Neighbor-wise Collective on Mat

### Input Parameters

| A | - the matrix
| R | - the projection matrix
| scall | - either MAT_INITIAL_MATRIX or MAT_REUSE_MATRIX
| fill | - expected fill as ratio of nnz(C)/nnz(A), use PETSC_DEFAULT if you do not have a good estimate if the result is a dense matrix this is irrelevent

### Output Parameters

C -the product matrix

### Notes

C will be created and must be destroyed by the user with MatDestroy().

This routine is currently only implemented for pairs of AIJ matrices and classes which inherit from AIJ.

### See Also

MatRARtSymbolic(), MatRARtNumeric(), MatMatMult(), MatPtAP()

Level:intermediate
Location: src/mat/interface/matrix.c
Index of all Mat routines
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Index of all manual pages