snes/interface/snesj2.c

18   SNESComputeJacobianDefaultColor - Computes the Jacobian using
24 + snes - nonlinear solver object
25 . x1   - location at which to evaluate Jacobian
26 - ctx  - `MatFDColoring` context or `NULL`
29 + J - Jacobian matrix (not altered in this routine)
30 - B - newly computed Jacobian matrix to use with preconditioner (generally the same as `J`)
33 + -snes_fd_color_use_mat       - use a matrix coloring from the explicit matrix nonzero pattern ins…
34 . -snes_fd_color               - Activates `SNESComputeJacobianDefaultColor()` in `SNESSetFromOptio…
35 . -mat_fd_coloring_err <err>   - Sets <err> (square root of relative error in the function)
36 . -mat_fd_coloring_umin <umin> - Sets umin, the minimum allowable u-value magnitude
37 . -mat_fd_type                 - Either wp or ds (see `MATMFFD_WP` or `MATMFFD_DS`)
38 . -snes_mf_operator            - Use matrix-free application of Jacobian
39 - -snes_mf                     - Use matrix-free Jacobian with no explicit Jacobian representation
49 …uting (approximate) Jacobians: user provided via `SNESSetJacobian()`, matrix-free via `SNESSetUseM…
79 …PetscCall(PetscOptionsGetBool(((PetscObject)snes)->options, ((PetscObject)snes)->prefix, "-snes_fd…  in SNESComputeJacobianDefaultColor()
92     if (dms->ops->computemffunction) {  in SNESComputeJacobianDefaultColor()
105   PetscCall(VecEqual(x1, snes->vec_sol, &solvec));  in SNESComputeJacobianDefaultColor()
106   if (!snes->vec_rhs && solvec) {  in SNESComputeJacobianDefaultColor()
120 …SNESPruneJacobianColor - Remove nondiagonal zeros in the Jacobian matrix and update the `MatMFFD` …
125 + snes - the `SNES` context
126 . J    - Jacobian matrix (not altered in this routine)
127 - B    - newly computed Jacobian matrix to use with preconditioner (generally the same as `J`)
138   usually call `SNESComputeJacobian()` with randomized input vectors to generate a dummy Jacobian.
152   /* Generate new coloring after eliminating zeros in the matrix */  in SNESPruneJacobianColor()
164   // Comment out the following branch to bypass the coverage test. You can uncomment it when needed.  in SNESPruneJacobianColor()
165   //if (dms->ops->computemffunction) {  in SNESPruneJacobianColor()