SNESNCG#
Nonlinear Conjugate-Gradient method for the solution of nonlinear systems [BKST15].
Options Database Keys#
-snes_ncg_type <fr, prp, dy, hs, cd> - Choice of conjugate-gradient update parameter, default is prp.
-snes_linesearch_type <cp,l2,basic> - Line search type.
-snes_ncg_monitor - Print the beta values nonlinear Conjugate-Gradient used in the iteration, .
Notes#
This solves the nonlinear system of equations \( F(x) = 0 \) using the nonlinear generalization of the conjugate gradient method. This may be used with a nonlinear preconditioner used to pick the new search directions, but otherwise chooses the initial search direction as \( F(x) \) for the initial guess \(x\).
Only supports left non-linear preconditioning.
Default line search is SNESLINESEARCHCP, unless a nonlinear preconditioner is used with -npc_snes_type SNESSetNPC(), or SNESGetNPC() then
SNESLINESEARCHL2 is used. Also supports the special purpose line search SNESLINESEARCHNCGLINEAR
References#
- BKST15
Peter R. Brune, Matthew G. Knepley, Barry F. Smith, and Xuemin Tu. Composing scalable nonlinear algebraic solvers. SIAM Review, 57(4):535–565, 2015. http://www.mcs.anl.gov/papers/P2010-0112.pdf. URL: http://www.mcs.anl.gov/papers/P2010-0112.pdf, doi:10.1137/130936725.
See Also#
SNES: Nonlinear Solvers, SNES, SNESNCG, SNESCreate(), SNES, SNESSetType(), SNESNEWTONLS, SNESNEWTONTR, SNESNGMRES, SNESQN, SNESLINESEARCHNCGLINEAR, SNESNCGSetType(), SNESLineSearchSetType()
Level#
beginner
Location#
Index of all SNES routines
Table of Contents for all manual pages
Index of all manual pages