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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="KSPFCG"><H1>KSPFCG</H1></A>
Implements the Flexible Conjugate Gradient method (FCG)
<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>-ksp_fcg_mmax <N> </B></TD><TD>- maximum number of search directions
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>-ksp_fcg_nprealloc <N> </B></TD><TD>- number of directions to preallocate
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>-ksp_fcg_truncation_type <standard,notay> </B></TD><TD>- truncation approach for directions
</TD></TR></TABLE>
<P>
Contributed by Patrick Sanan
<P>
<H3><FONT COLOR="#CC3333">Notes</FONT></H3>
Supports left preconditioning only.
<P>
<P>
<H3><FONT COLOR="#CC3333">References</FONT></H3>
<TABLE border="0" cellpadding="0" cellspacing="0">
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>1. </B></TD><TD>- Notay, Y."Flexible Conjugate Gradients", SIAM J. Sci. Comput. 22:4, 2000
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>2. </B></TD><TD>- Axelsson, O. and Vassilevski, P. S. "A Black Box Generalized Conjugate Gradient Solver with Inner Iterations and Variable step Preconditioning",
SIAM J. Matrix Anal. Appl. 12:4, 1991
</TD></TR></TABLE>
<P>
.seealso : <A HREF="../KSP/KSPGCR.html#KSPGCR">KSPGCR</A>, <A HREF="../KSP/KSPFGMRES.html#KSPFGMRES">KSPFGMRES</A>, <A HREF="../KSP/KSPCG.html#KSPCG">KSPCG</A>, <A HREF="../KSP/KSPFCGSetMmax.html#KSPFCGSetMmax">KSPFCGSetMmax</A>(), <A HREF="../KSP/KSPFCGGetMmax.html#KSPFCGGetMmax">KSPFCGGetMmax</A>(), <A HREF="../KSP/KSPFCGSetNprealloc.html#KSPFCGSetNprealloc">KSPFCGSetNprealloc</A>(), <A HREF="../KSP/KSPFCGGetNprealloc.html#KSPFCGGetNprealloc">KSPFCGGetNprealloc</A>(), <A HREF="../KSP/KSPFCGSetTruncationType.html#KSPFCGSetTruncationType">KSPFCGSetTruncationType</A>(), <A HREF="../KSP/KSPFCGGetTruncationType.html#KSPFCGGetTruncationType">KSPFCGGetTruncationType</A>()
<P>
<P><B><P><B><FONT COLOR="#CC3333">Level:</FONT></B>beginner
<BR><FONT COLOR="#CC3333">Location:</FONT></B><A HREF="../../../src/ksp/ksp/impls/fcg/fcg.c.html#KSPFCG">src/ksp/ksp/impls/fcg/fcg.c</A>
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