SNESNEWTONLS

Newton based nonlinear solver that uses a line search

Options Database Keys

• -snes_linesearch_type bt - basic (or equivalently none), bt, l2, cp, nleqerr, shell. Select line search type, see SNESLineSearchSetType()

• -snes_linesearch_order 3 - 2, 3. Selects the order of the line search for bt, see SNESLineSearchSetOrder()

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

• -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 \( ||y|| > maxstep \) then scale y to be \(y = y * maxstep/||y||.\)

• -snes_linesearch_minlambda minlambda - Sets the minimum lambda the line search will tolerate

• -snes_linesearch_monitor - print information about the progress of line searches

• -snes_linesearch_damping - damping factor used for the 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

Examples

src/snes/tutorials/ex1.c

---

Index of all SNES routines
Table of Contents for all manual pages
Index of all manual pages