#include "petscsnes.h" PetscErrorCode SNESComputeJacobian(SNES snes,Vec X,Mat A,Mat B)Collective on SNES and Mat
| snes | - the SNES context | |
| x | - input vector |
| A | - Jacobian matrix | |
| B | - optional preconditioning matrix |
| -snes_lag_preconditioner <lag> | - . -snes_lag_jacobian <lag> | |
| -snes_compare_explicit | - Compare the computed Jacobian to the finite difference Jacobian and output the differences | |
| -snes_compare_explicit_draw | - Compare the computed Jacobian to the finite difference Jacobian and draw the result | |
| -snes_compare_explicit_contour | - Compare the computed Jacobian to the finite difference Jacobian and draw a contour plot with the result | |
| -snes_compare_operator | - Make the comparison options above use the operator instead of the preconditioning matrix | |
| -snes_compare_coloring | - Compute the finite differece Jacobian using coloring and display norms of difference | |
| -snes_compare_coloring_display | - Compute the finite differece Jacobian using coloring and display verbose differences | |
| -snes_compare_coloring_threshold | - Display only those matrix entries that differ by more than a given threshold | |
| -snes_compare_coloring_threshold_atol | - Absolute tolerance for difference in matrix entries to be displayed by -snes_compare_coloring_threshold | |
| -snes_compare_coloring_threshold_rtol | - Relative tolerance for difference in matrix entries to be displayed by -snes_compare_coloring_threshold | |
| -snes_compare_coloring_draw | - Compute the finite differece Jacobian using coloring and draw differences | |
| -snes_compare_coloring_draw_contour | - Compute the finite differece Jacobian using coloring and show contours of matrices and differences |
See KSPSetOperators() for important information about setting the flag parameter.
Level:developer
Location:src/snes/interface/snes.c
Index of all SNES routines
Table of Contents for all manual pages
Index of all manual pages