PETSc version 3.15.5

TaoSetHessianRoutine

Sets the function to compute the Hessian as well as the location to store the matrix.

#include "petsctao.h" 
PetscErrorCode TaoSetHessianRoutine(Tao tao, Mat H, Mat Hpre, PetscErrorCode (*func)(Tao, Vec, Mat, Mat, void*), void *ctx)

Logically collective on Tao

	tao	- the Tao context
	H	- Matrix used for the hessian
	Hpre	- Matrix that will be used operated on by preconditioner, can be same as H
	func	- Hessian evaluation routine
	ctx	- [optional] user-defined context for private data for the Hessian evaluation routine (may be NULL)

   func(Tao tao,Vec x,Mat H,Mat Hpre,void *ctx);

	tao	- the Tao context
	x	- input vector
	H	- Hessian matrix
	Hpre	- preconditioner matrix, usually the same as H
	ctx	- [optional] user-defined Hessian context

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