petsc-3.14.5 2021-03-03
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# DMTSSetRHSJacobian

set TS Jacobian evaluation function

### Synopsis

    #include "petscts.h"
    PetscErrorCode DMTSSetRHSJacobian(DM dm,TSRHSJacobian func,void *ctx)

Not Collective

### Input Argument

| dm | - DM to be used with TS
| func | - Jacobian evaluation routine
| ctx | - context for residual evaluation

### Calling sequence of func

        PetscErrorCode func(TS ts,PetscReal t,Vec u,Mat A,Mat B,void *ctx);

| t | - current timestep
| u | - input vector
| Amat | - (approximate) Jacobian matrix
| Pmat | - matrix from which preconditioner is to be constructed (usually the same as Amat)
| ctx | - [optional] user-defined context for matrix evaluation routine

### Note

TSSetJacobian() is normally used, but it calls this function internally because the user context is actually associated with the DM. This makes the interface consistent regardless of whether the user interacts with a DM or not. If DM took a more central role at some later date, this could become the primary method of setting the Jacobian.

### See Also

DMTSSetContext(), TSSetFunction(), DMTSGetJacobian(), TSSetRHSJacobian()

### Level

advanced

### Location

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