petsc-3.3-p7 2013-05-11

SNESSetInitialFunctionNorm

 Sets the function norm to be used as the function norm at the initialization of the method. In some instances, the user has precomputed the function and its norm before calling SNESSolve. This function allows one to avoid a redundant call to SNESComputeFunction() and VecNorm() in that case.

Synopsis

#include "petscsnes.h"  
#include "petscdmshell.h" 
#include "petscsys.h" 
PetscErrorCode  SNESSetInitialFunctionNorm(SNES snes, PetscReal fnorm)
Logically Collective on SNES

Input Parameters

snes - the SNES context
fnorm - the norm of F as set by SNESSetInitialFunction()

This is used extensively in the SNESFAS hierarchy and in nonlinear preconditioning.

Keywords

SNES, nonlinear, set, function, norm

See Also

SNESSetFunction(), SNESComputeFunction(), SNESSetInitialFunction()

Level:developer
Location:src/snes/interface/snes.c
Index of all SNES routines
Table of Contents for all manual pages
Index of all manual pages