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<div id="version" align=right><b>petsc-3.4.2 2013-07-02</b></div>
<A NAME="SNESNCGSetType"><H1>SNESNCGSetType</H1></A>
Sets the conjugate update type for <A HREF="../SNES/SNESNCG.html#SNESNCG">SNESNCG</A>.
<H3><FONT COLOR="#CC3333">Synopsis</FONT></H3>
<PRE>
#include "petscsnes.h"
PetscErrorCode SNESNCGSetType(SNES snes, SNESNCGType btype)
</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>btype </B></TD><TD>- update type
</TD></TR></TABLE>
<P>
<H3><FONT COLOR="#CC3333">Options Database</FONT></H3>
<DT><B>-snes_ncg_type<prp,fr,hs,dy,cd></B> -
<br>
<P>
<H3><FONT COLOR="#CC3333">SNESNCGSelectTypes</FONT></H3>
<TABLE border="0" cellpadding="0" cellspacing="0">
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>SNES_NCG_FR </B></TD><TD>- Fletcher-Reeves update
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>SNES_NCG_PRP </B></TD><TD>- Polak-Ribiere-Polyak update
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>SNES_NCG_HS </B></TD><TD>- Hestenes-Steifel update
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>SNES_NCG_DY </B></TD><TD>- Dai-Yuan update
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>SNES_NCG_CD </B></TD><TD>- Conjugate Descent update
</TD></TR></TABLE>
<P>
<H3><FONT COLOR="#CC3333">Notes</FONT></H3>
PRP is the default, and the only one that tolerates generalized search directions.
<P>
<H3><FONT COLOR="#CC3333">Keywords</FONT></H3>
<A HREF="../SNES/SNES.html#SNES">SNES</A>, <A HREF="../SNES/SNESNCG.html#SNESNCG">SNESNCG</A>, selection, type, set
<BR><P><B><P><B><FONT COLOR="#CC3333">Level:</FONT></B>intermediate
<BR><FONT COLOR="#CC3333">Location:</FONT></B><A HREF="../../../src/snes/impls/ncg/snesncg.c.html#SNESNCGSetType">src/snes/impls/ncg/snesncg.c</A>
<BR><A HREF="./index.html">Index of all SNES routines</A>
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