#include "petscmat.h" PetscErrorCode MatMatMultSymbolic(Mat A,Mat B,PetscReal fill,Mat *C)Neighbor-wise Collective on Mat Many br
A | - the left matrix Many br | |
B | - the right matrix Many br | |
fill | - expected fill as ratio of nnz(C)/(nnz(A) + nnz(B)), use PETSC_DEFAULT if you do not have a good estimate, Many brif C is a dense matrix this is irrelevent Many br |
To determine the correct fill value, run with -info and search for the string "Fill ratio" to see the value Many bractually needed. Many br
This routine is currently implemented for Many br- pairs of AIJ matrices and classes which inherit from AIJ, C will be of type AIJ Many br- pairs of AIJ (A) and Dense (B) matrix, C will be of type Dense. Many br- pairs of Dense (A) and AIJ (B) matrix, C will be of type Dense. Many br
Many br
Developers Note: There are ways to estimate the number of nonzeros in the resulting product, see for example, http://arxiv.org/abs/1006.4173 Many brWe should incorporate them into PETSc. Many br
Level:intermediate
Location:src/mat/interface/matrix.c
Index of all Mat routines
Table of Contents for all manual pages
Index of all manual pages