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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="DMPlexGetOrdering"><H1>DMPlexGetOrdering</H1></A>
Calculate a reordering of the mesh
<H3><FONT COLOR="#CC3333">Synopsis</FONT></H3>
<PRE>
#include "petscdmplex.h"
#include "petscmat.h"
<A HREF="../Sys/PetscErrorCode.html#PetscErrorCode">PetscErrorCode</A> <A HREF="../DMPLEX/DMPlexGetOrdering.html#DMPlexGetOrdering">DMPlexGetOrdering</A>(<A HREF="../DM/DM.html#DM">DM</A> dm, <A HREF="../Mat/MatOrderingType.html#MatOrderingType">MatOrderingType</A> otype, <A HREF="../DM/DMLabel.html#DMLabel">DMLabel</A> label, <A HREF="../IS/IS.html#IS">IS</A> *perm)
</PRE>
Collective on dm
<P>
<H3><FONT COLOR="#CC3333">Input Parameter</FONT></H3>
<TABLE border="0" cellpadding="0" cellspacing="0">
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>dm </B></TD><TD>- The DMPlex object
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>otype </B></TD><TD>- type of reordering, one of the following:
</TD></TR>
<pre>
MATORDERINGNATURAL - Natural
</pre>
<pre>
MATORDERINGND - Nested Dissection
</pre>
<pre>
MATORDERING1WD - One-way Dissection
</pre>
<pre>
MATORDERINGRCM - Reverse Cuthill-McKee
</pre>
<pre>
MATORDERINGQMD - Quotient Minimum Degree
</pre>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>label </B></TD><TD>- [Optional] Label used to segregate ordering into sets, or NULL
</TD></TR></TABLE>
<P>
<P>
<H3><FONT COLOR="#CC3333">Output Parameter</FONT></H3>
<TABLE border="0" cellpadding="0" cellspacing="0">
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>perm </B></TD><TD>- The point permutation as an <A HREF="../IS/IS.html#IS">IS</A>, perm[old point number] = new point number
</TD></TR></TABLE>
<P>
Note: The label is used to group sets of points together by label value. This makes it easy to reorder a mesh which
has different types of cells, and then loop over each set of reordered cells for assembly.
<P>
<P>
<H3><FONT COLOR="#CC3333">See Also</FONT></H3>
<A HREF="../MatOrderings/MatGetOrdering.html#MatGetOrdering">MatGetOrdering</A>()
<BR><P><B></B><H3><FONT COLOR="#CC3333">Level</FONT></H3>intermediate<BR>
<H3><FONT COLOR="#CC3333">Location</FONT></H3>
</B><A HREF="../../../src/dm/impls/plex/plexreorder.c.html#DMPlexGetOrdering">src/dm/impls/plex/plexreorder.c</A>
<BR><A HREF="./index.html">Index of all DMPLEX routines</A>
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