MatMFFDSetCheckh

Sets a function that checks the computed h and adjusts it to satisfy some criteria for the MATMFFD matrix

Synopsis

#include "petscmat.h"   
PetscErrorCode MatMFFDSetCheckh(Mat J, PetscErrorCode (*fun)(void *, Vec, Vec, PetscScalar *), void *ctx)

Logically Collective

Input Parameters

• J - the MATMFFD matrix

• fun - the function that checks h

• ctx - any context needed by the function

Options Database Keys

• -mat_mffd_check_positivity - Insure that U + h*a is non-negative

Notes

For example, MatMFFDCheckPositivity() insures that all entries of U + h*a are non-negative

The function you provide is called after the default h has been computed and allows you to modify it.

See Also

Matrices, Mat, MATMFFD, MatMFFDCheckPositivity()

Level

advanced

Location

src/mat/impls/mffd/mffd.c

Implementations

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

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