petsc-3.12.5 2020-03-29

TSGetCostHessianProducts

Returns the gradients from the TSAdjointSolve()

#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

intermediate