petsc-3.7.1 2016-05-15
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
| A | - the matrix created with MatCreateSNESMF() Many br |
| umin | - the parameter Many br |
Many br
Notes
See the manual page for MatCreateSNESMF() for a complete description of the Many bralgorithm used to compute h. Many br
See Also
MatMFFDSetFunctionError(), MatCreateSNESMF()
Level:advanced
Location:src/mat/impls/mffd/mffddef.c
Index of all Mat routines
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Index of all manual pages