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<div id="version" align=right><b>petsc-3.7.5 2017-01-01</b></div>
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<A NAME="TaoSetTolerances"><H1>TaoSetTolerances</H1></A>
Sets parameters used in TAO convergence tests
<H3><FONT COLOR="#CC3333">Synopsis</FONT></H3>
<PRE>
#include "petsctao.h"
PetscErrorCode TaoSetTolerances(Tao tao, PetscReal gatol, PetscReal grtol, PetscReal gttol)
</PRE>
Logically collective on <A HREF="../Tao/Tao.html#Tao">Tao</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>tao </B></TD><TD>- the <A HREF="../Tao/Tao.html#Tao">Tao</A> context
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>gatol </B></TD><TD>- stop if norm of gradient is less than this
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>grtol </B></TD><TD>- stop if relative norm of gradient is less than this
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>gttol </B></TD><TD>- stop if norm of gradient is reduced by this factor
</TD></TR></TABLE>
<P>
<H3><FONT COLOR="#CC3333">Options Database Keys</FONT></H3>
<TABLE border="0" cellpadding="0" cellspacing="0">
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>-tao_gatol <gatol> </B></TD><TD>- Sets gatol
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>-tao_grtol <grtol> </B></TD><TD>- Sets grtol
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>-tao_gttol <gttol> </B></TD><TD>- Sets gttol
</TD></TR></TABLE>
<P>
<H3><FONT COLOR="#CC3333">Stopping Criteria</FONT></H3>
<pre>
||g(X)|| <= gatol
</pre>
<pre>
||g(X)|| / |f(X)| <= grtol
</pre>
<pre>
||g(X)|| / ||g(X0)|| <= gttol
</pre>
<P>
<H3><FONT COLOR="#CC3333">Notes</FONT></H3>
Use <A HREF="../Sys/PETSC_DEFAULT.html#PETSC_DEFAULT">PETSC_DEFAULT</A> to leave one or more tolerances unchanged.
<P>
<P>
<H3><FONT COLOR="#CC3333">See Also</FONT></H3>
<A HREF="../Tao/TaoGetTolerances.html#TaoGetTolerances">TaoGetTolerances</A>()
<BR>
<P>
<P><B><P><B><FONT COLOR="#CC3333">Level:</FONT></B>beginner
<BR><FONT COLOR="#CC3333">Location:</FONT></B><A HREF="../../../src/tao/interface/taosolver.c.html#TaoSetTolerances">src/tao/interface/taosolver.c</A>
<BR><A HREF="./index.html">Index of all Tao routines</A>
<BR><A HREF="../../index.html">Table of Contents for all manual pages</A>
<BR><A HREF="../singleindex.html">Index of all manual pages</A>
<P><H3><FONT COLOR="#CC3333">Examples</FONT></H3>
<A HREF="../../../src/ts/examples/tutorials/ex16opt_p.c.html">src/ts/examples/tutorials/ex16opt_p.c.html</A><BR>
<A HREF="../../../src/ts/examples/tutorials/ex16opt_ic.c.html">src/ts/examples/tutorials/ex16opt_ic.c.html</A><BR>
<A HREF="../../../src/ts/examples/tutorials/ex20opt_p.c.html">src/ts/examples/tutorials/ex20opt_p.c.html</A><BR>
<A HREF="../../../src/ts/examples/tutorials/ex20opt_ic.c.html">src/ts/examples/tutorials/ex20opt_ic.c.html</A><BR>
<A HREF="../../../src/tao/constrained/examples/tutorials/maros.c.html">src/tao/constrained/examples/tutorials/maros.c.html</A><BR>
<A HREF="../../../src/tao/constrained/examples/tutorials/toy.c.html">src/tao/constrained/examples/tutorials/toy.c.html</A><BR>
<A HREF="../../../src/tao/constrained/examples/tutorials/toyf.F.html">src/tao/constrained/examples/tutorials/toyf.F.html</A><BR>
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