SNESLINESEARCHCP#

Critical point line search. This line search assumes that there exists some artificial G(x) for which the SNESFunction F(x) = grad G(x). Therefore, this line search seeks to find roots of dot(F, Y) via a secant method.

Options Database Keys#

  • -snes_linesearch_minlambda - the minimum acceptable lambda

  • -snes_linesearch_maxstep - the algorithm insures that a step length is never longer than this value

  • -snes_linesearch_damping - initial trial step length is scaled by this factor, default is 1.0

  • -snes_linesearch_max_it <max_it> - the maximum number of secant steps performed.

Notes#

This method does NOT use the objective function if it is provided with SNESSetObjective().

This method is the preferred line search for SNESQN and SNESNCG.

See Also#

SNES: Nonlinear Solvers, SNESLineSearch, SNESLineSearchType, SNESLineSearchCreate(), SNESLineSearchSetType()

Level#

advanced

Location#

src/snes/linesearch/impls/cp/linesearchcp.c

Index of all SNES routines
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Index of all manual pages