MatMFFDSetFunctioni

Sets the function for a single component for a MATMFFD matrix

Synopsis

#include "petscmat.h"   
PetscErrorCode MatMFFDSetFunctioni(Mat mat, PetscErrorCode (*funci)(void *, PetscInt, Vec, PetscScalar *))

Logically Collective

Input Parameters

• mat - the matrix-free matrix MATMFFD

• funci - the function to use

Notes

If you use this you MUST call MatAssemblyBegin() and MatAssemblyEnd() on the matrix-free matrix inside your compute Jacobian routine.

This function is necessary to compute the diagonal of the matrix. funci must not contain any MPI call as it is called inside a loop on the local portion of the vector.

See Also

Matrices, Mat, MATMFFD, MatCreateSNESMF(), MatMFFDGetH(), MatMFFDSetHHistory(), MatMFFDResetHHistory(), SNESetFunction(), MatGetDiagonal()

Level

advanced

Location

src/mat/impls/mffd/mffd.c

Implementations

MatMFFDSetFunctioni_MFFD() in src/mat/impls/mffd/mffd.c

---

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