SNESLineSearchPreCheckPicard#

Implements a correction that is sometimes useful to improve the convergence rate of Picard iteration

Synopsis#

#include "petscsnes.h" 
PetscErrorCode SNESLineSearchPreCheckPicard(SNESLineSearch linesearch, Vec X, Vec Y, PetscBool *changed, void *ctx)

Logically Collective on linesearch

Input Parameters#

  • linesearch - linesearch context

  • X - base state for this step

  • ctx - context for this function

Input/Output Parameter#

  • Y - correction, possibly modified

Output Parameter#

  • changed - flag indicating that Y was modified

Options Database Key#

  • -snes_linesearch_precheck_picard - activate this routine

  • -snes_linesearch_precheck_picard_angle - angle

Notes#

This function should be passed to SNESLineSearchSetPreCheck()

The justification for this method involves the linear convergence of a Picard iteration so the Picard linearization should be provided in place of the “Jacobian”. This correction is generally not useful when using a Newton linearization.

Reference#

. - * - Hindmarsh and Payne (1996) Time step limits for stable solutions of the ice sheet equation, Annals of Glaciology.

See Also#

SNESLineSearch, SNESSetPicard(), SNESGetLineSearch(), SNESLineSearchSetPreCheck()

Level#

advanced

Location#

src/snes/linesearch/interface/linesearch.c

Examples#

src/snes/tutorials/ex15.c.html


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