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<div id="version" align=right><b>petsc-3.4.2 2013-07-02</b></div>
<A NAME="SNESQNSetScaleType"><H1>SNESQNSetScaleType</H1></A>
Sets the scaling type for the inner inverse jacobian in <A HREF="../SNES/SNESQN.html#SNESQN">SNESQN</A>.
<H3><FONT COLOR="#CC3333">Synopsis</FONT></H3>
<PRE>
#include "petscsnes.h"
PetscErrorCode SNESQNSetScaleType(SNES snes, SNESQNScaleType stype)
</PRE>
Logically Collective on <A HREF="../SNES/SNES.html#SNES">SNES</A>
<P>
<H3><FONT COLOR="#CC3333">Input Parameters</FONT></H3>
<TABLE border="0" cellpadding="0" cellspacing="0">
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>snes </B></TD><TD>- the iterative context
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>stype </B></TD><TD>- scale type
</TD></TR></TABLE>
<P>
<H3><FONT COLOR="#CC3333">Options Database</FONT></H3>
<DT><B>-snes_qn_scale_type<shanno,none,linesearch,jacobian></B> -
<br>
<P>
<H3><FONT COLOR="#CC3333">SNESQNSelectTypes</FONT></H3>
<TABLE border="0" cellpadding="0" cellspacing="0">
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>SNES_QN_SCALE_NONE </B></TD><TD>- don't scale the problem
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>SNES_QN_SCALE_SHANNO </B></TD><TD>- use shanno scaling
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>SNES_QN_SCALE_LINESEARCH </B></TD><TD>- scale based upon line search lambda
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>SNES_QN_SCALE_JACOBIAN </B></TD><TD>- scale by inverting a previously computed Jacobian.
</TD></TR></TABLE>
<P>
<H3><FONT COLOR="#CC3333">Keywords</FONT></H3>
<A HREF="../SNES/SNES.html#SNES">SNES</A>, <A HREF="../SNES/SNESQN.html#SNESQN">SNESQN</A>, scaling, type, set <A HREF="../SNES/SNESLineSearch.html#SNESLineSearch">SNESLineSearch</A>
<BR><P><B><P><B><FONT COLOR="#CC3333">Level:</FONT></B>intermediate
<BR><FONT COLOR="#CC3333">Location:</FONT></B><A HREF="../../../src/snes/impls/qn/qn.c.html#SNESQNSetScaleType">src/snes/impls/qn/qn.c</A>
<BR><A HREF="./index.html">Index of all SNES routines</A>
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