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   <div id="version" align=right><b>petsc-3.4.2 2013-07-02</b></div>
<A NAME="KSPGMRESSetHapTol"><H1>KSPGMRESSetHapTol</H1></A>
Sets tolerance for determining happy breakdown in GMRES, FGMRES and LGMRES. 
<H3><FONT COLOR="#CC3333">Synopsis</FONT></H3>
<PRE>
#include "petscksp.h"  
PetscErrorCode  KSPGMRESSetHapTol(KSP ksp,PetscReal tol)
</PRE>
Logically Collective on <A HREF="../KSP/KSP.html#KSP">KSP</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>ksp </B></TD><TD>- the Krylov space context
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>tol </B></TD><TD>- the tolerance
</TD></TR></TABLE>
<P>
<H3><FONT COLOR="#CC3333">Options Database</FONT></H3>
<DT><B>-ksp_gmres_haptol &lt;positive real value&gt;</B> -
Note: Happy breakdown is the rare case in GMRES where an 'exact' solution is obtained after
a certain number of iterations. If you attempt more iterations after this point unstable
things can happen hence very occasionally you may need to set this value to detect this condition
<br>
<P>

<P>
<H3><FONT COLOR="#CC3333">Keywords</FONT></H3>
 <A HREF="../KSP/KSP.html#KSP">KSP</A>, GMRES, tolerance
<BR>
<P>
<H3><FONT COLOR="#CC3333">See Also</FONT></H3>
 <A HREF="../KSP/KSPSetTolerances.html#KSPSetTolerances">KSPSetTolerances</A>()
<BR><P><B><P><B><FONT COLOR="#CC3333">Level:</FONT></B>intermediate
<BR><FONT COLOR="#CC3333">Location:</FONT></B><A HREF="../../../src/ksp/ksp/impls/gmres/gmres.c.html#KSPGMRESSetHapTol">src/ksp/ksp/impls/gmres/gmres.c</A>
<BR><A HREF="./index.html">Index of all KSP routines</A>
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