1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
|
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML3.2 EN">
<HTML>
<HEAD> <link rel="canonical" href="http://www.mcs.anl.gov/petsc/petsc-current/docs/manualpages/SNES/SNESKSPGetUseEW.html" />
<META NAME="GENERATOR" CONTENT="DOCTEXT">
<TITLE>SNESKSPGetUseEW</TITLE>
</HEAD>
<BODY BGCOLOR="FFFFFF">
<div id="version" align=right><b>petsc-3.7.5 2017-01-01</b></div>
<div id="bugreport" align=right><a href="mailto:petsc-maint@mcs.anl.gov?subject=Typo or Error in Documentation &body=Please describe the typo or error in the documentation: petsc-3.7.5 v3.7.5 docs/manualpages/SNES/SNESKSPGetUseEW.html "><small>Report Typos and Errors</small></a></div>
<A NAME="SNESKSPGetUseEW"><H1>SNESKSPGetUseEW</H1></A>
Gets if <A HREF="../SNES/SNES.html#SNES">SNES</A> is using Eisenstat-Walker method for computing relative tolerance for linear solvers within an inexact Newton method.
<H3><FONT COLOR="#CC3333">Synopsis</FONT></H3>
<PRE>
#include "petscsnes.h"
PetscErrorCode SNESKSPGetUseEW(SNES snes, PetscBool *flag)
</PRE>
Not Collective
<P>
<H3><FONT COLOR="#CC3333">Input Parameter</FONT></H3>
<DT><B>snes </B> -<A HREF="../SNES/SNES.html#SNES">SNES</A> context
<br>
<P>
<H3><FONT COLOR="#CC3333">Output Parameter</FONT></H3>
<DT><B>flag </B> -<A HREF="../Sys/PETSC_TRUE.html#PETSC_TRUE">PETSC_TRUE</A> or <A HREF="../Sys/PETSC_FALSE.html#PETSC_FALSE">PETSC_FALSE</A>
<br>
<P>
<H3><FONT COLOR="#CC3333">Notes</FONT></H3>
Currently, the default is to use a constant relative tolerance for
the inner linear solvers. Alternatively, one can use the
Eisenstat-Walker method, where the relative convergence tolerance
is reset at each Newton iteration according progress of the nonlinear
solver.
<P>
<P>
<H3><FONT COLOR="#CC3333">Reference</FONT></H3>
S. C. Eisenstat and H. F. Walker, "Choosing the forcing terms in an
inexact Newton method", SISC 17 (1), pp.16-32, 1996.
<P>
<H3><FONT COLOR="#CC3333">Keywords</FONT></H3>
<A HREF="../SNES/SNES.html#SNES">SNES</A>, <A HREF="../KSP/KSP.html#KSP">KSP</A>, Eisenstat, Walker, convergence, test, inexact, Newton
<BR>
<P>
<H3><FONT COLOR="#CC3333">See Also</FONT></H3>
<A HREF="../SNES/SNESKSPSetUseEW.html#SNESKSPSetUseEW">SNESKSPSetUseEW</A>(), <A HREF="../SNES/SNESKSPGetParametersEW.html#SNESKSPGetParametersEW">SNESKSPGetParametersEW</A>(), <A HREF="../SNES/SNESKSPSetParametersEW.html#SNESKSPSetParametersEW">SNESKSPSetParametersEW</A>()
<BR><P><B><P><B><FONT COLOR="#CC3333">Level:</FONT></B>advanced
<BR><FONT COLOR="#CC3333">Location:</FONT></B><A HREF="../../../src/snes/interface/snes.c.html#SNESKSPGetUseEW">src/snes/interface/snes.c</A>
<BR><A HREF="./index.html">Index of all SNES routines</A>
<BR><A HREF="../../index.html">Table of Contents for all manual pages</A>
<BR><A HREF="../singleindex.html">Index of all manual pages</A>
</BODY></HTML>
|
