Trust Region problem

Gong Ding gdiso at
Sat Mar 17 05:28:02 CDT 2007

Hi all,
   I use PETSC's nonelinear solver to do
emiconductor simulation. I found a strange problem
with trust region solvers. It usually works well
if LU method is used for inner linear solver. But
when krylov method i.e. GMRES, is employed, it
often stops due to pnorm is small, but still
remains large error of function norm. How to solve
this problem? LU method is much slower than i.e.

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