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<div id="version" align=right><b>petsc-3.10.3 2018-12-18</b></div>
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<A NAME="SNESNCG"><H1>SNESNCG</H1></A>
Nonlinear Conjugate-Gradient method for the solution of general nonlinear systems.
<P>
<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_ncg_type <fr, prp, dy, hs, cd> </B></TD><TD>- Choice of conjugate-gradient update parameter, default is prp.
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>-snes_linesearch_type <cp,l2,basic> </B></TD><TD>- Line search type.
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>-snes_ncg_monitor </B></TD><TD>- Print relevant information about the ncg iteration.
</TD></TR></TABLE>
<P>
<H3><FONT COLOR="#CC3333">Notes</FONT></H3>
This solves the nonlinear system of equations F(x) = 0 using the nonlinear generalization of the conjugate
gradient method. This may be used with a nonlinear preconditioner used to pick the new search directions, but otherwise
chooses the initial search direction as F(x) for the initial guess x.
<P>
Only supports left non-linear preconditioning.
<P>
<H3><FONT COLOR="#CC3333">References</FONT></H3>
<DT><B>1. </B> -Peter R. Brune, Matthew G. Knepley, Barry F. Smith, and Xuemin Tu,"Composing Scalable Nonlinear Algebraic Solvers",
SIAM Review, 57(4), 2015
<br>
<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/SNESNEWTONTR.html#SNESNEWTONTR">SNESNEWTONTR</A>, <A HREF="../SNES/SNESNGMRES.html#SNESNGMRES">SNESNGMRES</A>, <A HREF="../SNES/SNESQN.html#SNESQN">SNESQN</A>
<BR><P><B></B><H3><FONT COLOR="#CC3333">Level</FONT></H3>beginner<BR>
<H3><FONT COLOR="#CC3333">Location</FONT></H3>
</B><A HREF="../../../src/snes/impls/ncg/snesncg.c.html#SNESNCG">src/snes/impls/ncg/snesncg.c</A>
<BR><A HREF="./index.html">Index of all SNES routines</A>
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