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<TITLE>SNESQNSetRestartType</TITLE>
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<div id="version" align=right><b>petsc-3.10.3 2018-12-18</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-3.10.3 v3.10.3 docs/manualpages/SNES/SNESQNSetRestartType.html "><small>Report Typos and Errors</small></a></div>
<A NAME="SNESQNSetRestartType"><H1>SNESQNSetRestartType</H1></A>
Sets the restart type for <A HREF="../SNES/SNESQN.html#SNESQN">SNESQN</A>.
<H3><FONT COLOR="#CC3333">Synopsis</FONT></H3>
<PRE>
#include "petscsnes.h"
<A HREF="../Sys/PetscErrorCode.html#PetscErrorCode">PetscErrorCode</A> <A HREF="../SNES/SNESQNSetRestartType.html#SNESQNSetRestartType">SNESQNSetRestartType</A>(<A HREF="../SNES/SNES.html#SNES">SNES</A> snes, SNESQNRestartType rtype)
</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>rtype </B></TD><TD>- restart type
</TD></TR></TABLE>
<P>
<H3><FONT COLOR="#CC3333">Options Database</FONT></H3>
<TABLE border="0" cellpadding="0" cellspacing="0">
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>-snes_qn_restart_type <powell,periodic,none> </B></TD><TD>- set the restart type
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>-snes_qn_m <m> </B></TD><TD>- sets the number of stored updates and the restart period for periodic
</TD></TR></TABLE>
<P>
<P>
<H3><FONT COLOR="#CC3333">SNESQNRestartTypes</FONT></H3>
<TABLE border="0" cellpadding="0" cellspacing="0">
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>SNES_QN_RESTART_NONE </B></TD><TD>- never restart
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>SNES_QN_RESTART_POWELL </B></TD><TD>- restart based upon descent criteria
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>SNES_QN_RESTART_PERIODIC </B></TD><TD>- restart after a fixed number of iterations
</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>, restart, type, set <A HREF="../SNES/SNESLineSearch.html#SNESLineSearch">SNESLineSearch</A>, SNESQNRestartType
<BR><P><B></B><H3><FONT COLOR="#CC3333">Level</FONT></H3>intermediate<BR>
<H3><FONT COLOR="#CC3333">Location</FONT></H3>
</B><A HREF="../../../src/snes/impls/qn/qn.c.html#SNESQNSetRestartType">src/snes/impls/qn/qn.c</A>
<P><H3><FONT COLOR="CC3333">Implementations</FONT></H3><A HREF="../../../src/snes/impls/qn/qn.c.html#SNESQNSetRestartType_QN">SNESQNSetRestartType_QN in src/snes/impls/qn/qn.c</A><BR>
<BR><A HREF="./index.html">Index of all SNES routines</A>
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