SNESTestJacobian

Computes the difference between the computed and finite-difference Jacobians

Synopsis

#include "petscsnes.h"  
PetscErrorCode SNESTestJacobian(SNES snes, PetscReal *Jnorm, PetscReal *diffNorm)

Collective

Input Parameter

• snes - the SNES context

Output Parameters

• Jnorm - the Frobenius norm of the computed Jacobian, or NULL

• diffNorm - the Frobenius norm of the difference of the computed and finite-difference Jacobians, or NULL

Options Database Keys

• -snes_test_jacobian - compare the user provided Jacobian with one compute via finite differences to check for errors. If a threshold is given, display only those entries whose difference is greater than the threshold.

• -snes_test_jacobian_view - display the user provided Jacobian, the finite difference Jacobian and the difference

Note

Directions and norms are printed to stdout if diffNorm is NULL.

See Also

SNES: Nonlinear Solvers, SNESTestFunction(), SNESSetJacobian(), SNESComputeJacobian()

Level

developer

Location

src/snes/interface/snes.c

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