petsc-3.14.6 2021-03-30

TSGetIJacobian

Returns the implicit Jacobian at the present timestep.

#include "petscts.h"  
PetscErrorCode  TSGetIJacobian(TS ts,Mat *Amat,Mat *Pmat,TSIJacobian *f,void **ctx)

Not Collective, but parallel objects are returned if TS is parallel

- The TS context obtained from TSCreate()

	Amat	- The (approximate) Jacobian of F(t,U,U_t)
	Pmat	- The matrix from which the preconditioner is constructed, often the same as Amat
	f	- The function to compute the matrices
	ctx	- User-defined context for Jacobian evaluation routine

You can pass in NULL for any return argument you do not need.

advanced