#include "petscts.h" PetscErrorCode TSComputeIJacobian(TS ts,PetscReal t,Vec U,Vec Udot,PetscReal shift,Mat A,Mat B,PetscBool imex)Collective on TS and Vec
Input
| ts | - the TS context | |
| t | - current timestep | |
| U | - state vector | |
| Udot | - time derivative of state vector | |
| shift | - shift to apply, see note below | |
| imex | - flag indicates if the method is IMEX so that the RHSJacobian should be kept separate |
| A | - Jacobian matrix | |
| B | - matrix from which the preconditioner is constructed; often the same as A |
dF/dU + shift*dF/dUdot
Most users should not need to explicitly call this routine, as it is used internally within the nonlinear solvers.