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<TITLE>SNESKSPGetUseEW</TITLE>
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<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 PETSCSNES_DLLEXPORT SNESKSPGetUseEW(SNES snes, PetscTruth *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>
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