petsc-3.14.6 2021-03-30

TSGetI2Jacobian

Returns the implicit Jacobian at the present timestep.

#include "petscts.h"  
PetscErrorCode  TSGetI2Jacobian(TS ts,Mat *J,Mat *P,TSI2Jacobian *jac,void **ctx)

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

- The TS context obtained from TSCreate()

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

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

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