MatMatMultSymbolic

 Performs construction, preallocation, and computes the ij structure of the matrix-matrix product C=A*B. Call this routine before calling MatMatMultNumeric().

Synopsis

#include "petscmat.h" 
PetscErrorCode PETSCMAT_DLLEXPORT MatMatMultSymbolic(Mat A,Mat B,PetscReal fill,Mat *C)
Collective on Mat

Input Parameters

A - the left matrix
B - the right matrix
fill - expected fill as ratio of nnz(C)/(nnz(A) + nnz(B))

Output Parameters

C -the matrix containing the ij structure of product matrix

Notes

C will be created and must be destroyed by the user with MatDestroy().

This routine is currently implemented for - pairs of AIJ matrices and classes which inherit from AIJ, C will be of type MATAIJ. - pairs of AIJ (A) and Dense (B) matrix, C will be of type MATDENSE.

See Also

MatMatMult(), MatMatMultNumeric()

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