# MatMFFDSetCheckh

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

### Synopsis

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

Collective on Mat

### 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 -

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

### See Also

MatMFFDSetCheckPositivity()

Level:advanced
Location:src/mat/impls/mffd/mffd.c
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