petsc-3.7.5 2017-01-01

TSComputeI2Jacobian

Evaluates the Jacobian of the DAE

#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 and Vec

	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

	J	- Jacobian matrix
	P	- optional preconditioning matrix

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.

TS, compute, Jacobian, matrix