SNESNEWTONLS

Newton based nonlinear solver that uses a line search

Options Database Keys

• -snes_linesearch_type - 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 - 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 the 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(), SNESLineSearchSetType()

Level

beginner

Location

src/snes/impls/ls/ls.c

Examples

src/snes/tutorials/ex1.c

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