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<TITLE>SNESNGMRESSetRestartType</TITLE>
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<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/SNESNGMRESSetRestartType.html "><small>Report Typos and Errors</small></a></div>
<A NAME="SNESNGMRESSetRestartType"><H1>SNESNGMRESSetRestartType</H1></A>
Sets the restart type for <A HREF="../SNES/SNESNGMRES.html#SNESNGMRES">SNESNGMRES</A>.
<H3><FONT COLOR="#CC3333">Synopsis</FONT></H3>
<PRE>
#include "petscsnes.h"
PetscErrorCode SNESNGMRESSetRestartType(SNES snes,SNESNGMRESRestartType 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_ngmres_restart_type<difference,periodic,none> </B></TD><TD>- set the restart type
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>-snes_ngmres_restart[30] </B></TD><TD>- sets the number of iterations before restart for periodic
</TD></TR></TABLE>
<P>
<P>
<H3><FONT COLOR="#CC3333">SNESNGMRESRestartTypes</FONT></H3>
<TABLE border="0" cellpadding="0" cellspacing="0">
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>SNES_NGMRES_RESTART_NONE </B></TD><TD>- never restart
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>SNES_NGMRES_RESTART_DIFFERENCE </B></TD><TD>- restart based upon difference criteria
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>SNES_NGMRES_RESTART_PERIODIC </B></TD><TD>- restart after a fixed number of iterations
</TD></TR></TABLE>
<P>
<H3><FONT COLOR="#CC3333">Notes</FONT></H3>
The default line search used is the L2 line search and it requires two additional function evaluations.
<P>
<H3><FONT COLOR="#CC3333">Keywords</FONT></H3>
<A HREF="../SNES/SNES.html#SNES">SNES</A>, <A HREF="../SNES/SNESNGMRES.html#SNESNGMRES">SNESNGMRES</A>, restart, 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/ngmres/snesngmres.c.html#SNESNGMRESSetRestartType">src/snes/impls/ngmres/snesngmres.c</A>
<BR><A HREF="./index.html">Index of all SNES routines</A>
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