#include "petscmat.h" PetscErrorCode MatMFFDSetFunctionError(Mat mat,PetscReal error)Logically Collective on Mat
mat | - the matrix free matrix created via MatCreateMFFD() or MatCreateSNESMF() | |
error_rel | - relative error (should be set to the square root of the relative error in the function evaluations) |
F'(u)*a = [F(u+h*a) - F(u)]/h where h = error_rel*u'a/||a||^2 if |u'a| > umin*||a||_{1} = error_rel*umin*sign(u'a)*||a||_{1}/||a||^2 else
Level:advanced
Location:src/mat/impls/mffd/mffd.c
Index of all Mat routines
Table of Contents for all manual pages
Index of all manual pages
-mat_mffd_err <error_rel> | - Sets error_rel |