petsc-master 2018-01-22
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TSComputeIJacobian

Evaluates the Jacobian of the DAE

Synopsis

#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

Input Parameters

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

Output Parameters

A - Jacobian matrix
B - matrix from which the preconditioner is constructed; often the same as A

Notes

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

dF/dU + shift*dF/dUdot

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

Keywords

TS, compute, Jacobian, matrix

See Also

TSSetIJacobian()

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