petsc-3.7.7 2017-09-25

TaoComputeHessian

Computes the Hessian matrix that has been set with TaoSetHessianRoutine().

#include "petsctao.h" 
PetscErrorCode TaoComputeHessian(Tao tao, Vec X, Mat H, Mat Hpre)

Collective on Tao

	solver	- the Tao solver context
	xx	- input vector

	H	- Hessian matrix
	Hpre	- Preconditioning matrix

Most users should not need to explicitly call this routine, as it is used internally within the minimization solvers.

TaoComputeHessian() is typically used within minimization implementations, so most users would not generally call this routine themselves.