petsc-3.12.5 2020-03-29
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MatPtAP

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

Synopsis

#include "petscmat.h" 
PetscErrorCode MatPtAP(Mat A,Mat P,MatReuse scall,PetscReal fill,Mat *C)
Neighbor-wise Collective on Mat

Input Parameters

A - the matrix
P - the projection matrix
scall - either MAT_INITIAL_MATRIX or MAT_REUSE_MATRIX
fill - expected fill as ratio of nnz(C)/(nnz(A) + nnz(P)), 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().

For matrix types without special implementation the function fallbacks to MatMatMult() followed by MatTransposeMatMult().

See Also

MatPtAPSymbolic(), MatPtAPNumeric(), MatMatMult(), MatRARt()

Level

intermediate

Location

src/mat/interface/matrix.c

Examples

src/tao/pde_constrained/examples/tutorials/elliptic.c.html

Implementations

MatPtAP_MPIAIJ_MPIAIJ in src/mat/impls/aij/mpi/mpiptap.c
MatPtAP_SeqAIJMKL_SeqAIJMKL_SpMV2 in src/mat/impls/aij/seq/aijmkl/aijmkl.c
MatPtAP_SeqAIJ_SeqAIJ in src/mat/impls/aij/seq/matptap.c
MatPtAP_SeqDense_SeqDense in src/mat/impls/dense/seq/dense.c
MatPtAP_AIJ_HYPRE in src/mat/impls/hypre/mhypre.c
MatPtAP_HYPRE_HYPRE in src/mat/impls/hypre/mhypre.c
MatPtAP_IS_XAIJ in src/mat/impls/is/matis.c
MatPtAP_SeqAIJ_SeqMAIJ in src/mat/impls/maij/maij.c
MatPtAP_MPIAIJ_MPIMAIJ in src/mat/impls/maij/maij.c
MatPtAP_MPIAIJ_MPIMAIJ_allatonce in src/mat/impls/maij/maij.c
MatPtAP_MPIAIJ_MPIMAIJ_allatonce_merged in src/mat/impls/maij/maij.c

Index of all Mat routines
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Index of all manual pages