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<div id="version" align=right><b>petsc-3.14.5 2021-03-03</b></div>
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<A NAME="PCFactorSetMatOrderingType"><H1>PCFactorSetMatOrderingType</H1></A>
Sets the ordering routine (to reduce fill) to be used in the LU, ILU, Cholesky, and ICC factorizations.
<H3><FONT COLOR="#CC3333">Synopsis</FONT></H3>
<PRE>
#include "petscpc.h"
<A HREF="../Sys/PetscErrorCode.html#PetscErrorCode">PetscErrorCode</A> <A HREF="../PC/PCFactorSetMatOrderingType.html#PCFactorSetMatOrderingType">PCFactorSetMatOrderingType</A>(<A HREF="../PC/PC.html#PC">PC</A> pc,<A HREF="../Mat/MatOrderingType.html#MatOrderingType">MatOrderingType</A> 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>
<TABLE border="0" cellpadding="0" cellspacing="0">
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>-pc_factor_mat_ordering_type <nd,rcm,...,external> </B></TD><TD>- Sets ordering routine
</TD></TR></TABLE>
<P>
<P>
<H3><FONT COLOR="#CC3333">Notes</FONT></H3>
nested dissection is used by default
<P>
For Cholesky and ICC and the SBAIJ format the only reordering available is natural since only the upper half of the matrix is stored
and reordering this matrix is very expensive.
<P>
You can use SeqAIJ matrix with Cholesky and ICC and use any ordering
<P>
external means PETSc will not compute an ordering and the package will use its own ordering, for <A HREF="../Mat/MATSOLVERCHOLMOD.html#MATSOLVERCHOLMOD">MATSOLVERCHOLMOD</A> and <A HREF="../Mat/MATSOLVERUMFPACK.html#MATSOLVERUMFPACK">MATSOLVERUMFPACK</A>
<P>
<H3><FONT COLOR="#CC3333">See Also</FONT></H3>
<A HREF="../Mat/MatOrderingType.html#MatOrderingType">MatOrderingType</A>
<BR>
<P>
<P><B></B><H3><FONT COLOR="#CC3333">Level</FONT></H3>intermediate<BR>
<H3><FONT COLOR="#CC3333">Location</FONT></H3>
</B><A HREF="../../../src/ksp/pc/impls/factor/factor.c.html#PCFactorSetMatOrderingType">src/ksp/pc/impls/factor/factor.c</A>
<P><H3><FONT COLOR="CC3333">Implementations</FONT></H3><A HREF="../../../src/ksp/pc/impls/factor/factimpl.c.html#PCFactorSetMatOrderingType_Factor">PCFactorSetMatOrderingType_Factor in src/ksp/pc/impls/factor/factimpl.c</A><BR>
<BR><A HREF="./index.html">Index of all PC routines</A>
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