petsc-3.14.5 2021-03-03
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# TSComputeI2Jacobian

Evaluates the Jacobian of the DAE

### Synopsis

    #include "petscts.h"
    PetscErrorCode TSComputeI2Jacobian(TS ts,PetscReal t,Vec U,Vec V,Vec A,PetscReal shiftV,PetscReal shiftA,Mat J,Mat P)

Collective on TS

### Input Parameters

| ts | - the TS context
| t | - current timestep
| U | - state vector
| V | - time derivative of state vector
| A | - second time derivative of state vector
| shiftV | - shift to apply, see note below
| shiftA | - shift to apply, see note below

### Output Parameters

| J | - Jacobian matrix
| P | - optional preconditioning matrix

### Notes

If F(t,U,V,A)=0 is the DAE, the required Jacobian is

dF/dU + shiftV*dF/dV + shiftA*dF/dA

Most users should not need to explicitly call this routine, as it is used internally within the nonlinear solvers.

### See Also

TSSetI2Jacobian()

### Level

developer

### Location

src/ts/interface/ts.c
Index of all TS routines
Table of Contents for all manual pages
Index of all manual pages