PETSc version 3.17.4
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# TSGetCostHessianProducts

Returns the gradients from the TSAdjointSolve()

### Synopsis

    #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

### Input Parameter

| ts | - the TS context obtained from TSCreate()

### Output Parameters

| 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

### See Also

TSSetCostHessianProducts()

### Level

intermediate

### Location

src/ts/interface/sensitivity/tssen.c
Index of all Sensitivity routines
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Index of all manual pages