petsc-3.12.4 2020-02-04
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# TSComputeI2Function

Evaluates the DAE residual written in implicit form F(t,U,U_t,U_tt) = 0

### Synopsis

    #include "petscts.h"
    PetscErrorCode TSComputeI2Function(TS ts,PetscReal t,Vec U,Vec V,Vec A,Vec F)

Collective on TS

### Input Parameters

| ts | - the TS context
| t | - current time
| U | - state vector
| V | - time derivative of state vector (U_t)
| A | - second time derivative of state vector (U_tt)

### Output Parameter

F -the residual vector

### Note

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

### See Also

TSSetI2Function()

### 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