SNESLINESEARCHBASIC#

This line search implementation is not a line search at all; it simply uses the full step. Thus, this routine is intended for methods with well-scaled updates; i.e. Newton’s method (SNESNEWTONLS), on well-behaved problems. Also named as SNESLINESEARCHNONE

Options Database Keys#

-snes_linesearch_damping - search vector is scaled by this amount, default is 1.0
-snes_linesearch_norms - whether to compute norms or not, default is true (SNESLineSearchSetComputeNorms())

Note#

For methods with ill-scaled updates (SNESNRICHARDSON, SNESNCG), a small damping parameter may yield satisfactory but slow convergence despite the lack of the line search.