#include "petscsnes.h" PetscErrorCode PETSCSNES_DLLEXPORT MatSNESMFSetFunctionError(Mat mat,PetscReal error)Collective on Mat
| mat | - the matrix free matrix created via MatCreateSNESMF() | |
| error_rel | - relative error (should be set to the square root of the relative error in the function evaluations) |
| -snes_mf_err <error_rel> | - Sets error_rel |