#include "petscts.h" PetscErrorCode TSGetCostHessianProducts(TS ts,PetscInt *numcost,Vec **lambda2,Vec **mu2, Vec *dir)Not Collective, but Vec returned is parallel if TS is parallel
| ts | - the TS context obtained from TSCreate() |
| numcost | - number of cost functions | |
| lambda2 | - Hessian-vector product with respect to the initial condition variables, the dimension and parallel layout of these vectors is the same as the ODE solution vector | |
| mu2 | - Hessian-vector product with respect to the parameters, the number of entries in these vectors is the same as the number of parameters | |
| dir | - the direction vector that are multiplied with the Hessian of the cost functions |