SNESLineSearchSetPreCheck#

Sets a user function that is called after the initial search direction has been computed but before the line search routine has been applied. Allows the user to adjust the result of (usually a linear solve) that determined the search direction.

Synopsis#

#include "petscsnes.h" 
PetscErrorCode SNESLineSearchSetPreCheck(SNESLineSearch linesearch, PetscErrorCode (*func)(SNESLineSearch, Vec, Vec, PetscBool *, void *), void *ctx)

Logically Collective

Input Parameters#

  • linesearch - the SNESLineSearch context

  • func - [optional] function evaluation routine, for the calling sequence see SNESLineSearchPreCheck()

  • ctx - [optional] user-defined context for private data for the function evaluation routine (may be NULL)

Note#

Use SNESLineSearchSetPostCheck() to change the step after the line search. search is complete.

Use SNESVISetVariableBounds() and SNESVISetComputeVariableBounds() to cause SNES to automatically control the ranges of variables allowed.

See Also#

SNESGetLineSearch(), SNESLineSearchPreCheck(), SNESLineSearchSetPostCheck(), SNESLineSearchGetPostCheck(), SNESLineSearchGetPreCheck(), SNESVISetVariableBounds(), SNESVISetComputeVariableBounds(), SNESSetFunctionDomainError(), SNESSetJacobianDomainError()

Level#

intermediate

Location#

src/snes/linesearch/interface/linesearch.c

Examples#

src/snes/tutorials/ex15.c
src/snes/tutorials/ex3.c

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