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(), SNESetFunction(), MatGetDiagonal()
Level#
advanced
Location#
Implementations#
MatMFFDSetFunctioni_MFFD in src/mat/impls/mffd/mffd.c
Index of all Mat routines
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Index of all manual pages