MatSNESMFSetCheckh

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

#include "petscsnes.h"   
int MatSNESMFSetCheckh(Mat J,int (*fun)(Vec,Vec,PetscScalar*,void*),void* ctx)

Collective on Mat

	J	- the MatSNESMF matrix
	fun	- the function that checks h
	ctx	- any context needed by the function

-snes_mf_check_positivity -

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