MatMFFDSetFunctioniBase

Sets the base vector for a single component function evaluation for a MATMFFD matrix

Synopsis

#include "petscmat.h"   
PetscErrorCode MatMFFDSetFunctioniBase(Mat mat, PetscErrorCode (*func)(void *, Vec))

Logically Collective

Input Parameters

• mat - the MATMFFD matrix-free matrix

• func - 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, used for example with PCJACOBI

See Also

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

Level

advanced

Location

src/mat/impls/mffd/mffd.c

Implementations

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

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