#include "petscsnes.h" PetscErrorCode SNESJacobianFunction(SNES snes,Vec x,Mat Amat,Mat Pmat,void *ctx);
| x | - input vector | |
| Amat | - the matrix that defines the (approximate) Jacobian | |
| Pmat | - the matrix to be used in constructing the preconditioner, usually the same as Amat. | |
| ctx | - [optional] user-defined Jacobian context |