SNESLINESEARCHBISECTION#
Bisection line search. Similar to the critical point line search, SNESLINESEARCHCP, the bisection line search assumes that there exists some for which the SNESFunctionFn . This line search seeks to find the root of the directional derivative along the search direction through bisection.
Options Database Keys#
-snes_linesearch_max_it <50> - maximum number of iterations for the line search
-snes_linesearch_damping <1.0> - initial trial step length on entry to the line search
-snes_linesearch_rtol <1e-8> - relative tolerance for the directional derivative
-snes_linesearch_atol <1e-6> - absolute tolerance for the directional derivative
-snes_linesearch_ltol <1e-6> - minimum absolute change in lambda allowed
Note#
This method does NOT use the objective function if it is provided with SNESSetObjective().
This line search will always give a step size in the interval [0, damping].
See Also#
SNES: Nonlinear Solvers, SNESLineSearch, SNESLineSearchType, SNESLineSearchCreate(), SNESLineSearchSetType(), SNESLINESEARCHCP
Level#
intermediate
Location#
src/snes/linesearch/impls/bisection/linesearchbisection.c
Index of all SNES routines
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Index of all manual pages