petsc-3.9.2 2018-05-20
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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().

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

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_SeqAIJ_SeqMAIJ in src/mat/impls/maij/maij.c
MatPtAP_MPIAIJ_MPIMAIJ in src/mat/impls/maij/maij.c

Index of all Mat routines
Table of Contents for all manual pages
Index of all manual pages