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<A NAME="PCLU"><H1>PCLU</H1></A>
Uses a direct solver, based on LU factorization, as a preconditioner
<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>-pc_lu_reuse_ordering </B></TD><TD>- Activate <A HREF="../PC/PCLUSetReuseOrdering.html#PCLUSetReuseOrdering">PCLUSetReuseOrdering</A>()
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>-pc_lu_reuse_fill </B></TD><TD>- Activates <A HREF="../PC/PCLUSetReuseFill.html#PCLUSetReuseFill">PCLUSetReuseFill</A>()
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>-pc_lu_fill <fill> </B></TD><TD>- Sets fill amount
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>-pc_lu_damping <damping> </B></TD><TD>- Sets damping amount
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>-pc_lu_in_place </B></TD><TD>- Activates in-place factorization
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>-pc_lu_mat_ordering_type <nd,rcm,...> </B></TD><TD>- Sets ordering routine
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>-pc_lu_pivoting <dtcol></B></TD><TD>- - -pc_lu_pivot_in_blocks <true,false> - allow pivoting within the small blocks during factorization (may increase
stability of factorization.
</TD></TR>
<P>
Notes: Not all options work for all matrix formats
Run with -help to see additional options for particular matrix formats or factorization
algorithms
<P>
<P>
<P>
Notes: Usually this will compute an "exact" solution in one iteration and does
not need a Krylov method (i.e. you can use -ksp_type preonly, or
<A HREF="../KSP/KSPSetType.html#KSPSetType">KSPSetType</A>(ksp,KSPPREONLY) for the Krylov method
<P>
<H3><FONT COLOR="#CC3333">See Also</FONT></H3>
<A HREF="../PC/PCCreate.html#PCCreate">PCCreate</A>(), <A HREF="../PC/PCSetType.html#PCSetType">PCSetType</A>(), <A HREF="../PC/PCType.html#PCType">PCType</A> (for list of available types), <A HREF="../PC/PC.html#PC">PC</A>,
<BR><A HREF="../PC/PCILU.html#PCILU">PCILU</A>, PCCHOLESKY, <A HREF="../PC/PCICC.html#PCICC">PCICC</A>, <A HREF="../PC/PCLUSetReuseOrdering.html#PCLUSetReuseOrdering">PCLUSetReuseOrdering</A>(), <A HREF="../PC/PCLUSetReuseFill.html#PCLUSetReuseFill">PCLUSetReuseFill</A>(), <A HREF="../PC/PCGetFactoredMatrix.html#PCGetFactoredMatrix">PCGetFactoredMatrix</A>(),
<A HREF="../PC/PCLUSetFill.html#PCLUSetFill">PCLUSetFill</A>(), <A HREF="../PC/PCLUSetDamping.html#PCLUSetDamping">PCLUSetDamping</A>(), <A HREF="../PC/PCLUSetUseInPlace.html#PCLUSetUseInPlace">PCLUSetUseInPlace</A>(), <A HREF="../PC/PCLUSetMatOrdering.html#PCLUSetMatOrdering">PCLUSetMatOrdering</A>(), <A HREF="../PC/PCLUSetPivoting.html#PCLUSetPivoting">PCLUSetPivoting</A>(),
PCLUSetPivotingInBlocks()
<P><B><P><B><FONT COLOR="#CC3333">Level:</FONT></B>beginner
<BR><FONT COLOR="#CC3333">Location:</FONT></B><A HREF="../../../src/ksp/pc/impls/lu/lu.c.html#PCLU">src/ksp/pc/impls/lu/lu.c</A>
<BR><A HREF="./index.html">Index of all PC 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>
<P><H3><FONT COLOR="#CC3333">Examples</FONT></H3>
<A HREF="../../../src/mat/examples/tutorials/ex3.c.html">src/mat/examples/tutorials/ex3.c.html</A><BR>
<A HREF="../../../src/ksp/examples/tutorials/ex13.c.html">src/ksp/examples/tutorials/ex13.c.html</A><BR>
<A HREF="../../../src/ksp/examples/tutorials/ex13f90.F.html">src/ksp/examples/tutorials/ex13f90.F.html</A><BR>
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