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   <div id="version" align=right><b>petsc-3.4.2 2013-07-02</b></div>
<A NAME="SNESLINESEARCHL2"><H1>SNESLINESEARCHL2</H1></A>
Secant search in the L2 norm of the function. The function norm is evaluated at points in [0, damping] to construct
a polynomial fitting.  This fitting is used to construct a new lambda
based upon secant descent.  The process is repeated on the new
interval, [lambda, lambda_old], max_it - 1 times.
<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>-snes_linesearch_max_it&lt;1&gt; </B></TD><TD>- maximum number of iterations
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>-snes_linesearch_damping&lt;1.0&gt; </B></TD><TD>- initial steplength
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>-snes_linesearch_minlambda </B></TD><TD>- minimum allowable lambda
</TD></TR></TABLE>
<P>

<P>
<H3><FONT COLOR="#CC3333">Keywords</FONT></H3>
 <A HREF="../SNES/SNES.html#SNES">SNES</A>, nonlinear, line search, norm, secant
<BR>
<P>
<H3><FONT COLOR="#CC3333">See Also</FONT></H3>
 SNESLineSearchBT, SNESLineSearchCP, <A HREF="../SNES/SNESLineSearch.html#SNESLineSearch">SNESLineSearch</A>
<BR><P><B><P><B><FONT COLOR="#CC3333">Level:</FONT></B>advanced
<BR><FONT COLOR="#CC3333">Location:</FONT></B><A HREF="../../../src/snes/linesearch/impls/l2/linesearchl2.c.html#SNESLINESEARCHL2">src/snes/linesearch/impls/l2/linesearchl2.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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