#include "petscsnes.h" PetscErrorCode PETSCSNES_DLLEXPORT SNESDefaultComputeJacobian(SNES snes,Vec x1,Mat *J,Mat *B,MatStructure *flag,void *ctx)Collective on SNES
x1 | - compute Jacobian at this point | |
ctx | - application's function context, as set with SNESSetFunction() |
J | - Jacobian matrix (not altered in this routine) | |
B | - newly computed Jacobian matrix to use with preconditioner (generally the same as J) | |
flag | - flag indicating whether the matrix sparsity structure has changed |
-snes_fd | - Activates SNESDefaultComputeJacobian() | |
-snes_test_err | - Square root of function error tolerance, default square root of machine epsilon (1.e-8 in double, 3.e-4 in single) | |
-mat_fd_type | - Either wp or ds (see MATSNESMF_WP or MATSNESMF_DS) |
An alternative routine that uses coloring to exploit matrix sparsity is SNESDefaultComputeJacobianColor().
Level:intermediate
Location:src/snes/interface/snesj.c
Index of all SNES routines
Table of Contents for all manual pages
Index of all manual pages