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<TITLE>SNESConverged_TR</TITLE>
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<A NAME="SNESConverged_TR"><H1>SNESConverged_TR</H1></A>
Monitors the convergence of the trust region method <A HREF="../SNES/SNESTR.html#SNESTR">SNESTR</A> for solving systems of nonlinear equations (default).
<H3><FONT COLOR="#CC3333">Synopsis</FONT></H3>
<PRE>
#include "petscsnes.h"
PetscErrorCode PETSCSNES_DLLEXPORT SNESConverged_TR(SNES snes,PetscInt it,PetscReal xnorm,PetscReal pnorm,PetscReal fnorm,SNESConvergedReason *reason,void *dummy)
</PRE>
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 <A HREF="../SNES/SNES.html#SNES">SNES</A> context
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>xnorm </B></TD><TD>- 2-norm of current iterate
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>pnorm </B></TD><TD>- 2-norm of current step
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>fnorm </B></TD><TD>- 2-norm of function
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>dummy </B></TD><TD>- unused context
</TD></TR></TABLE>
<P>
<H3><FONT COLOR="#CC3333">Output Parameter</FONT></H3>
<DT><B>reason </B> -one of
<br>
<pre>
<A HREF="../SNES/SNES_CONVERGED_FNORM_ABS.html#SNES_CONVERGED_FNORM_ABS">SNES_CONVERGED_FNORM_ABS</A> - (fnorm < abstol),
</pre>
<pre>
<A HREF="../SNES/SNES_CONVERGED_PNORM_RELATIVE.html#SNES_CONVERGED_PNORM_RELATIVE">SNES_CONVERGED_PNORM_RELATIVE</A> - (pnorm < xtol*xnorm),
</pre>
<pre>
<A HREF="../SNES/SNES_CONVERGED_FNORM_RELATIVE.html#SNES_CONVERGED_FNORM_RELATIVE">SNES_CONVERGED_FNORM_RELATIVE</A> - (fnorm < rtol*fnorm0),
</pre>
<pre>
<A HREF="../SNES/SNES_DIVERGED_FUNCTION_COUNT.html#SNES_DIVERGED_FUNCTION_COUNT">SNES_DIVERGED_FUNCTION_COUNT</A> - (nfct > maxf),
</pre>
<pre>
<A HREF="../SNES/SNES_DIVERGED_FNORM_NAN.html#SNES_DIVERGED_FNORM_NAN">SNES_DIVERGED_FNORM_NAN</A> - (fnorm == NaN),
</pre>
<pre>
SNES_CONVERGED_TR_DELTA - (delta < xnorm*deltatol),
</pre>
<pre>
SNES_CONVERGED_ITERATING - (otherwise)
</pre>
<P>
where
<TABLE border="0" cellpadding="0" cellspacing="0">
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>delta </B></TD><TD>- trust region paramenter
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>deltatol </B></TD><TD>- trust region <A HREF="../Sys/size.html#size">size</A> tolerance,
set with <A HREF="../SNES/SNESSetTrustRegionTolerance.html#SNESSetTrustRegionTolerance">SNESSetTrustRegionTolerance</A>()
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>maxf </B></TD><TD>- maximum number of function evaluations,
set with <A HREF="../SNES/SNESSetTolerances.html#SNESSetTolerances">SNESSetTolerances</A>()
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>nfct </B></TD><TD>- number of function evaluations,
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>abstol </B></TD><TD>- absolute function norm tolerance,
set with <A HREF="../SNES/SNESSetTolerances.html#SNESSetTolerances">SNESSetTolerances</A>()
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>xtol </B></TD><TD>- relative function norm tolerance,
set with <A HREF="../SNES/SNESSetTolerances.html#SNESSetTolerances">SNESSetTolerances</A>()
</TD></TR></TABLE>
<P>
<P>
<H3><FONT COLOR="#CC3333">Keywords</FONT></H3>
<A HREF="../SNES/SNES.html#SNES">SNES</A>, nonlinear, default, converged, convergence
<BR>
<P>
<H3><FONT COLOR="#CC3333">See Also</FONT></H3>
<A HREF="../SNES/SNESSetConvergenceTest.html#SNESSetConvergenceTest">SNESSetConvergenceTest</A>(), SNESEisenstatWalkerConverged()
<BR><P><B><P><B><FONT COLOR="#CC3333">Level:</FONT></B>intermediate
<BR><FONT COLOR="#CC3333">Location:</FONT></B><A HREF="../../../src/snes/impls/tr/tr.c.html#SNESConverged_TR">src/snes/impls/tr/tr.c</A>
<BR><A HREF="./index.html">Index of all SNES routines</A>
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