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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML3.2 EN">
<HTML>
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<META NAME="GENERATOR" CONTENT="DOCTEXT">
<TITLE>SNESTR</TITLE>
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<BODY BGCOLOR="FFFFFF">
<A NAME="SNESTR"><H1>SNESTR</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>- .    -snes_tr_delta1 &lt;delta1&gt;
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>-snes_tr_delta2 &lt;delta2&gt;</B></TD><TD>- -    -snes_tr_delta3 &lt;delta3&gt;
</TD></TR>
<P>
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.
<P>
This is intended as a model implementation, since it does not
necessarily have many of the bells and whistles of other
implementations.
<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/SNESLS.html#SNESLS">SNESLS</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#SNESTR">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>
</BODY></HTML>