petsc-3.8.4 2018-03-24
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MatPtAPSymbolic

 Creates the (i,j) structure of the matrix product C = P^T * A * P

Synopsis

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

Input Parameters

A - the matrix
P - the projection matrix

Output Parameters

C -the (i,j) structure of 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 SeqAIJ matrices and classes which inherit from SeqAIJ. C will be of type MATSEQAIJ. The product is computed using this (i,j) structure by calling MatPtAPNumeric().

See Also

MatPtAP(), MatPtAPNumeric(), MatMatMultSymbolic()

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