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<TITLE>PCCholesky</TITLE>
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<A NAME="PCCholesky"><H1>PCCholesky</H1></A>
Uses a direct solver, based on Cholesky 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_cholesky_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_cholesky_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_cholesky_fill <fill> </B></TD><TD>- Sets fill amount
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>-pc_cholesky_damping <damping> </B></TD><TD>- Sets damping amount
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>-pc_cholesky_shift </B></TD><TD>- Activates Manteuffel shift
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>-pc_cholesky_in_place </B></TD><TD>- Activates in-place factorization
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>-pc_cholesky_mat_ordering_type <nd,rcm,...> </B></TD><TD>- Sets ordering routine
</TD></TR></TABLE>
<P>
Notes: Not all options work for all matrix formats
<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>, <A HREF="../PC/PCLU.html#PCLU">PCLU</A>, <A HREF="../PC/PCICC.html#PCICC">PCICC</A>, <A HREF="../PC/PCCholeskySetReuseOrdering.html#PCCholeskySetReuseOrdering">PCCholeskySetReuseOrdering</A>(), <A HREF="../PC/PCCholeskySetReuseFill.html#PCCholeskySetReuseFill">PCCholeskySetReuseFill</A>(), <A HREF="../PC/PCGetFactoredMatrix.html#PCGetFactoredMatrix">PCGetFactoredMatrix</A>(),
<A HREF="../PC/PCCholeskySetFill.html#PCCholeskySetFill">PCCholeskySetFill</A>(), <A HREF="../PC/PCCholeskySetDamping.html#PCCholeskySetDamping">PCCholeskySetDamping</A>(), <A HREF="../PC/PCCholeskySetShift.html#PCCholeskySetShift">PCCholeskySetShift</A>(),
<A HREF="../PC/PCCholeskySetUseInPlace.html#PCCholeskySetUseInPlace">PCCholeskySetUseInPlace</A>(), <A HREF="../PC/PCCholeskySetMatOrdering.html#PCCholeskySetMatOrdering">PCCholeskySetMatOrdering</A>()
<P>
<P><B><P><B><FONT COLOR="#CC3333">Level:</FONT></B>beginner
<BR><FONT COLOR="#CC3333">Location:</FONT></B><A HREF="../../../src/ksp/pc/impls/cholesky/cholesky.c.html#PCCholesky">src/ksp/pc/impls/cholesky/cholesky.c</A>
<BR><A HREF="./index.html">Index of all PC routines</A>
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