SNESNoLineSearch

This routine is not a line search at all; it simply uses the full Newton step. Thus, this routine is intended to serve as a template and is not recommended for general use.

Synopsis

int SNESNoLineSearch(SNES snes,void *lsctx,Vec x,Vec f,Vec g,Vec y,Vec w,PetscReal fnorm,PetscReal *ynorm,PetscReal *gnorm,int *flag)

Collective on SNES and Vec

Input Parameters

	snes	- nonlinear context
	lsctx	- optional context for line search (not used here)
	x	- current iterate
	f	- residual evaluated at x
	y	- search direction (contains new iterate on output)
	w	- work vector
	fnorm	- 2-norm of f

Output Parameters

	g	- residual evaluated at new iterate y
	y	- new iterate (contains search direction on input)
	gnorm	- 2-norm of g
	ynorm	- 2-norm of search length
	flag	- set to 0, indicating a successful line search

Options Database Key

-snes_ls basic -Activates SNESNoLineSearch()

Keywords