petsc-3.6.1 2015-08-06
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KSPRichardsonSetSelfScale

 Sets Richardson to automatically determine optimal scaling at each iteration to minimize the 2-norm of the preconditioned residual

Synopsis

#include "petscksp.h" 
PetscErrorCode  KSPRichardsonSetSelfScale(KSP ksp,PetscBool scale)
Logically Collective on KSP

Input Parameters

ksp - the iterative context
scale - PETSC_TRUE or the default of PETSC_FALSE

Notes: Requires two extra work vectors. Uses an extra VecAXPY() and VecDotNorm2() per iteration.

Developer Notes: Could also minimize the 2-norm of the true residual with one less work vector

Keywords

KSP, Richardson, set, scale

Level:intermediate
Location:src/ksp/ksp/impls/rich/richscale.c
Index of all KSP routines
Table of Contents for all manual pages
Index of all manual pages