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<TITLE>DMPlexSetClosurePermutationTensor</TITLE>
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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="DMPlexSetClosurePermutationTensor"><H1>DMPlexSetClosurePermutationTensor</H1></A>
Create a permutation from the default (BFS) point ordering in the closure, to a lexicographic ordering over the tensor product cell (i.e., line, quad, hex, etc.), and set this permutation in the section provided (or the section of the <A HREF="../DM/DM.html#DM">DM</A>).
<H3><FONT COLOR="#CC3333">Synopsis</FONT></H3>
<PRE>
#include "petscdmplex.h"
<A HREF="../Sys/PetscErrorCode.html#PetscErrorCode">PetscErrorCode</A> <A HREF="../DMPLEX/DMPlexSetClosurePermutationTensor.html#DMPlexSetClosurePermutationTensor">DMPlexSetClosurePermutationTensor</A>(<A HREF="../DM/DM.html#DM">DM</A> dm, <A HREF="../Sys/PetscInt.html#PetscInt">PetscInt</A> point, <A HREF="../PetscSection/PetscSection.html#PetscSection">PetscSection</A> section)
</PRE>
<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>dm </B></TD><TD>- The <A HREF="../DM/DM.html#DM">DM</A>
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>point </B></TD><TD>- Either a cell (highest dim point) or an edge (dim 1 point), or <A HREF="../Sys/PETSC_DETERMINE.html#PETSC_DETERMINE">PETSC_DETERMINE</A>
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>section </B></TD><TD>- The <A HREF="../PetscSection/PetscSection.html#PetscSection">PetscSection</A> to reorder, or NULL for the default section
</TD></TR></TABLE>
<P>
Note: The point is used to determine the number of dofs/field on an edge. For SEM, this is related to the polynomial
degree of the basis.
<P>
<H3><FONT COLOR="#CC3333">Example</FONT></H3>
A typical interpolated single-quad mesh might order points as
<PRE>
[c0, v1, v2, v3, v4, e5, e6, e7, e8]
v4 -- e6 -- v3
| |
e7 c0 e8
| |
v1 -- e5 -- v2
</PRE>
<P>
(There is no significance to the ordering described here.) The default section for a Q3 quad might typically assign
dofs in the order of points, e.g.,
<PRE>
c0 -> [0,1,2,3]
v1 -> [4]
...
e5 -> [8, 9]
</PRE>
<P>
which corresponds to the dofs
<PRE>
6 10 11 7
13 2 3 15
12 0 1 14
4 8 9 5
</PRE>
<P>
The closure in BFS ordering works through height strata (cells, edges, vertices) to produce the ordering
<PRE>
0 1 2 3 8 9 14 15 11 10 13 12 4 5 7 6
</PRE>
<P>
After calling <A HREF="../DMPLEX/DMPlexSetClosurePermutationTensor.html#DMPlexSetClosurePermutationTensor">DMPlexSetClosurePermutationTensor</A>(), the closure will be ordered lexicographically,
<PRE>
4 8 9 5 12 0 1 14 13 2 3 15 6 10 11 7
</PRE>
<P>
<P>
<H3><FONT COLOR="#CC3333">See Also</FONT></H3>
<A HREF="../DM/DMGetLocalSection.html#DMGetLocalSection">DMGetLocalSection</A>(), <A HREF="../PetscSection/PetscSectionSetClosurePermutation.html#PetscSectionSetClosurePermutation">PetscSectionSetClosurePermutation</A>(), <A HREF="../DM/DMSetGlobalSection.html#DMSetGlobalSection">DMSetGlobalSection</A>()
<BR><P><B></B><H3><FONT COLOR="#CC3333">Level</FONT></H3>developer<BR>
<H3><FONT COLOR="#CC3333">Location</FONT></H3>
</B><A HREF="../../../src/dm/impls/plex/plex.c.html#DMPlexSetClosurePermutationTensor">src/dm/impls/plex/plex.c</A>
<P><H3><FONT COLOR="#CC3333">Examples</FONT></H3>
<A HREF="../../../src/dm/impls/plex/tutorials/ex6.c.html">src/dm/impls/plex/tutorials/ex6.c.html</A><BR>
<A HREF="../../../src/dm/impls/plex/tutorials/ex8.c.html">src/dm/impls/plex/tutorials/ex8.c.html</A><BR>
<BR><A HREF="./index.html">Index of all DMPLEX routines</A>
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