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
MATMFFDfunci - 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(), SNESSetFunction(), MatGetDiagonal()
Level#
advanced
Location#
Implementations#
MatMFFDSetFunctioni_MFFD() in src/mat/impls/mffd/mffd.c
Index of all Mat routines
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