TaoAppDefaultComputeHessianColor

Computes the Hessian using colored finite differences.

Synopsis

#include "tao.h"  
int TaoAppDefaultComputeHessianColor(TAO_APPLICATION taoapp, Vec V, Mat *HH,Mat *BB,
                               MatStructure *flag,void *ctx)
Collective on TAO_APPLICATION

Input Parameters

tao - the TAO_APPLICATION context
V - compute Hessian at this point
ctx - the TAO_APPLICATION structure, cast to (void*)

Output Parameters

H - Hessian matrix (not altered in this routine)
B - newly computed Hessian matrix to use with preconditioner (generally the same as H)
flag - flag indicating whether the matrix sparsity structure has changed

Options Database Keys

Note

The gradient evaluation must be set using the routine TaoSetPetscGradient().

.keywords: TAO_APPLICATION, finite differences, Hessian, coloring, sparse

See Also

TaoAppSetHessianRoutine(), TaoAppDefaultComputeHessian(),SNESDefaultComputeJacobianColor(),
TaoAppSetGradientRoutine(), TaoAppSetColoring()

Level:intermediate
Location:src/petsctao/application/petscapp/fdiff.c
TAO Solver Index
Table of Contents

Examples

src/unconstrained/examples/tutorials/minsurf2.c.html
-mat_fd_coloring_freq <freq>- - -tao_view_hessian - view the hessian after each evaluation using PETSC_VIEWER_STDOUT_WORLD