SNESNEWTONLS#

Newton based nonlinear solver that uses a line search

Options Database Keys#

  • -snes_linesearch_type - bt,basic. Select line search type

  • -snes_linesearch_order <3> - 2, 3. Selects the order of the line search for bt

  • -snes_linesearch_norms - Turns on/off computation of the norms for basic linesearch (SNESLineSearchSetComputeNorms())

  • -snes_linesearch_alpha - Sets alpha used in determining if reduction in function norm is sufficient

  • -snes_linesearch_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 - Sets the minimum lambda the line search will tolerate

  • -snes_linesearch_monitor - print information about progress of line searches

  • -snes_linesearch_damping - damping factor used for basic line search

Note#

This is the default nonlinear solver in SNES

See Also#

SNES: Nonlinear Solvers, SNESCreate(), SNES, SNESSetType(), SNESNEWTONTR, SNESQN, SNESLineSearchSetType(), SNESLineSearchSetOrder() SNESLineSearchSetPostCheck(), SNESLineSearchSetPreCheck() SNESLineSearchSetComputeNorms(), SNESGetLineSearch()

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