petsc-3.7.5 2017-01-01
MatMFFDDSSetUmin
Sets the "umin" parameter used by the PETSc routine for computing the differencing parameter, h, which is used for matrix-free Jacobian-vector products.
Synopsis
#include "petscmat.h"
PetscErrorCode MatMFFDDSSetUmin(Mat A,PetscReal umin)
Input Parameters
Notes
See the manual page for MatCreateSNESMF() for a complete description of the
algorithm used to compute h.
See Also
MatMFFDSetFunctionError(), MatCreateSNESMF()
Level:advanced
Location:src/mat/impls/mffd/mffddef.c
Index of all Mat routines
Table of Contents for all manual pages
Index of all manual pages