petsc-3.3-p0 2012-06-05

SNESLS

Newton based nonlinear solver that uses a line search

Options Database

-snes_linesearch [bt,basic] - Selects line search
-snes_linesearch_order[quadratic,cubic] - Selects the order of the line search for bt
-snes_linesearch_norms<true> - Turns on/off computation of the norms for basic
-snes_linesearch_alpha<alpha> - Sets alpha used in determining if reduction in function norm is sufficient
-snes_linesearch_maxstep<maxstep> - Sets the maximum stepsize the line search will use (if the 2-norm(y) > maxstep then scale y to be y = (maxstep/2-norm(y)) *y)
-snes_linesearch_minlambda<minlambda> - Sets the minimum lambda the line search will use minlambda / max_i ( y[i]/x[i] )
-snes_linesearch_monitor - print information about progress of line searches
-snes_linesearch_damping - damping factor used for basic line search

Notes: This is the default nonlinear solver in SNES

See Also

SNESCreate(), SNES, SNESSetType(), SNESTR, SNESLineSearchSet(),
SNESLineSearchSetPostCheck(), SNESLineSearchNo(), SNESLineSearchCubic(), SNESLineSearchQuadratic(), SNESLineSearchSet(), SNESLineSearchNoNorms(), SNESLineSearchSetPreCheck(), SNESLineSearchSetParams(), SNESLineSearchGetParams()

Level:beginner
Location:
src/snes/impls/ls/ls.c
Index of all SNES routines
Table of Contents for all manual pages
Index of all manual pages