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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/SNESNEWTONTR.html "><small>Report Typos and Errors</small></a></div>
<A NAME="SNESNEWTONTR"><H1>SNESNEWTONTR</H1></A>
Newton based nonlinear solver that uses a trust region 
<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_trtol &lt;tol&gt; Trust region tolerance</B></TD><TD>- .    -snes_tr_mu &lt;mu&gt;
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>-snes_tr_eta &lt;eta&gt;</B></TD><TD>- .    -snes_tr_sigma &lt;sigma&gt;
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>-snes_tr_delta0 &lt;delta0&gt; </B></TD><TD>- initial size of the trust region is delta0*norm2(x)
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>-snes_tr_delta1 &lt;delta1&gt;</B></TD><TD>- .    -snes_tr_delta2 &lt;delta2&gt;
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>-snes_tr_delta3 &lt;delta3&gt;</B></TD><TD>- 
The basic algorithm is taken from "The Minpack Project", by More',
Sorensen, Garbow, Hillstrom, pages 88-111 of "Sources and Development
of Mathematical Software", Wayne Cowell, editor.
</TD></TR></TABLE>
<P>

<P>
<H3><FONT COLOR="#CC3333">See Also</FONT></H3>
  <A HREF="../SNES/SNESCreate.html#SNESCreate">SNESCreate</A>(), <A HREF="../SNES/SNES.html#SNES">SNES</A>, <A HREF="../SNES/SNESSetType.html#SNESSetType">SNESSetType</A>(), <A HREF="../SNES/SNESNEWTONLS.html#SNESNEWTONLS">SNESNEWTONLS</A>, <A HREF="../SNES/SNESSetTrustRegionTolerance.html#SNESSetTrustRegionTolerance">SNESSetTrustRegionTolerance</A>()
<BR>
<P>
<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#SNESNEWTONTR">src/snes/impls/tr/tr.c</A>
<BR><A HREF="./index.html">Index of all SNES 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>
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