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   <div id="version" align=right><b>petsc-3.4.2 2013-07-02</b></div>
<A NAME="PCFactorSetMatOrderingType"><H1>PCFactorSetMatOrderingType</H1></A>
Sets the ordering routine (to reduce fill) to be used in the LU factorization. 
<H3><FONT COLOR="#CC3333">Synopsis</FONT></H3>
<PRE>
#include "petscpc.h" 
PetscErrorCode  PCFactorSetMatOrderingType(PC pc,MatOrderingType ordering)
</PRE>
Logically Collective on <A HREF="../PC/PC.html#PC">PC</A>
<P>
<H3><FONT COLOR="#CC3333">Input Parameters</FONT></H3>
<TABLE border="0" cellpadding="0" cellspacing="0">
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>pc </B></TD><TD>- the preconditioner context
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>ordering </B></TD><TD>- the matrix ordering name, for example, MATORDERINGND or MATORDERINGRCM
</TD></TR></TABLE>
<P>
<H3><FONT COLOR="#CC3333">Options Database Key</FONT></H3>
<DT><B>-pc_factor_mat_ordering_type &lt;nd,rcm,...&gt; </B> -Sets ordering routine
<br>
<P>

<P>
Notes: nested dissection is used by default
<P>
For Cholesky and ICC and the SBAIJ format reorderings are not available,
since only the upper triangular part of the matrix is stored. You can use the
SeqAIJ format in this case to get reorderings.
<P>
<P><B><P><B><FONT COLOR="#CC3333">Level:</FONT></B>intermediate
<BR><FONT COLOR="#CC3333">Location:</FONT></B><A HREF="../../../src/ksp/pc/impls/factor/factor.c.html#PCFactorSetMatOrderingType">src/ksp/pc/impls/factor/factor.c</A>
<BR><A HREF="./index.html">Index of all PC routines</A>
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