petsc-3.10.5 2019-03-28
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# TSComputeRHSJacobian

Computes the Jacobian matrix that has been set with TSSetRHSJacobian().

### Synopsis

    #include "petscts.h"
    PetscErrorCode  TSComputeRHSJacobian(TS ts,PetscReal t,Vec U,Mat A,Mat B)

Collective on TS and Vec

### Input Parameters

| ts | - the TS context
| t | - current timestep
| U | - input vector

### Output Parameters

| A | - Jacobian matrix
| B | - optional preconditioning matrix
| flag | - flag indicating matrix structure

### Notes

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

See KSPSetOperators() for important information about setting the flag parameter.

### Keywords

SNES, compute, Jacobian, matrix

### See Also

TSSetRHSJacobian(), KSPSetOperators()

### 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