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 for a MATMFFD matrix.

Synopsis#

#include "petscmat.h"   
PetscErrorCode MatMFFDDSSetUmin(Mat A, PetscReal umin)

Input Parameters#

A - the MATMFFD matrix
umin - the parameter

Note#

See the manual page for MatCreateSNESMF() for a complete description of the algorithm used to compute h.

Level#

advanced

Location#

src/mat/impls/mffd/mffddef.c

Implementations#

MatMFFDDSSetUmin_DS() in src/mat/impls/mffd/mffddef.c

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