| -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 relevant information about the ncg 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.