| a43d07b4 | 06-Dec-2009 |
Barry Smith <bsmith@mcs.anl.gov> |
Comment had wrong formula for amijo condition.
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-a
Comment had wrong formula for amijo condition.
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
Hg-commit: b70b3b4d6d320d020d947ff85a8cacf2f35119af
show more ...
|