Hi All, I am trying to figure out how the line search is actually working in PETSc and I am looking at this link,
http://www.mcs.anl.gov/petsc/petsc-as/snapshots/petsc-current/docs/manualpages/SNES/SNESLineSearchGetParams.html Can anyone help to explain why there is a J in the amijo condition? *alpha *- The scalar such that .5*f_{n+1} . f_{n+1} <= .5*f_n . f_n - alpha |f_n . J . f_n| Considering the fact that the newton direction p_n provide a J^{-1} and the gradient of the merit function( 1/2 f . f) provide a J, isn't correct to get rid of J in the definition above? Thanks for any suggestions, Yan -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.mcs.anl.gov/pipermail/petsc-users/attachments/20091205/de34587a/attachment.htm>
