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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="SNESNEWTONLS"><H1>SNESNEWTONLS</H1></A>
Newton based nonlinear solver that uses a line search 
<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_linesearch_type &lt;bt&gt; </B></TD><TD>- bt,basic.  Select line search type
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>-snes_linesearch_order &lt;3&gt; </B></TD><TD>- 2, 3. Selects the order of the line search for bt
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>-snes_linesearch_norms &lt;true&gt; </B></TD><TD>- Turns on/off computation of the norms for basic linesearch
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>-snes_linesearch_alpha &lt;alpha&gt; </B></TD><TD>- Sets alpha used in determining if reduction in function norm is sufficient
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>-snes_linesearch_maxstep &lt;maxstep&gt; </B></TD><TD>- Sets the maximum stepsize the line search will use (if the 2-norm(y) &gt; maxstep then scale y to be y = (maxstep/2-norm(y)) *y)
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>-snes_linesearch_minlambda &lt;minlambda&gt;  </B></TD><TD>- Sets the minimum lambda the line search will tolerate
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>-snes_linesearch_monitor </B></TD><TD>- print information about progress of line searches
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>-snes_linesearch_damping </B></TD><TD>- damping factor used for basic line search
</TD></TR></TABLE>
<P>
Notes: This is the default nonlinear solver in <A HREF="../SNES/SNES.html#SNES">SNES</A>
<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/SNESNEWTONTR.html#SNESNEWTONTR">SNESNEWTONTR</A>, <A HREF="../SNES/SNESQN.html#SNESQN">SNESQN</A>, <A HREF="../SNES/SNESLineSearchSetType.html#SNESLineSearchSetType">SNESLineSearchSetType</A>(), <A HREF="../SNES/SNESLineSearchSetOrder.html#SNESLineSearchSetOrder">SNESLineSearchSetOrder</A>()
<BR><A HREF="../SNES/SNESLineSearchSetPostCheck.html#SNESLineSearchSetPostCheck">SNESLineSearchSetPostCheck</A>(), <A HREF="../SNES/SNESLineSearchSetPreCheck.html#SNESLineSearchSetPreCheck">SNESLineSearchSetPreCheck</A>() <A HREF="../SNES/SNESLineSearchSetComputeNorms.html#SNESLineSearchSetComputeNorms">SNESLineSearchSetComputeNorms</A>()
<P>
<P><B><P><B><FONT COLOR="#CC3333">Level:</FONT></B>beginner
<BR><FONT COLOR="#CC3333">Location:</FONT></B><A HREF="../../../src/snes/impls/ls/ls.c.html#SNESNEWTONLS">src/snes/impls/ls/ls.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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