#include "petscmat.h" PetscErrorCode MatMatMatMult(Mat A,Mat B,Mat C,MatReuse scall,PetscReal fill,Mat *D)Neighbor-wise Collective on Mat Many br
A | - the left matrix Many br | |
B | - the middle matrix Many br | |
C | - the right matrix Many br | |
scall | - either MAT_INITIAL_MATRIX or MAT_REUSE_MATRIX Many br | |
fill | - expected fill as ratio of nnz(D)/(nnz(A) + nnz(B)+nnz(C)), use PETSC_DEFAULT if you do not have a good estimate Many brif the result is a dense matrix this is irrelevent Many br |
MAT_REUSE_MATRIX can only be used if the matrices A, B and C have the same nonzero pattern as in the previous call 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
If you have many matrices with the same non-zero structure to multiply, you Many brshould use MAT_REUSE_MATRIX in all calls but the first or Many br
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