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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="MatMeshToCellGraph"><H1>MatMeshToCellGraph</H1></A>
Uses the ParMETIS package to convert a <A HREF="../Mat/Mat.html#Mat">Mat</A> that represents a mesh to a <A HREF="../Mat/Mat.html#Mat">Mat</A> the represents the graph of the coupling between cells (the "dual" graph) and is suitable for partitioning with the <A HREF="../Mat/MatPartitioning.html#MatPartitioning">MatPartitioning</A> object. Use this to partition cells of a mesh.
<H3><FONT COLOR="#CC3333">Synopsis</FONT></H3>
<PRE>
#include "petscmat.h"
<A HREF="../Sys/PetscErrorCode.html#PetscErrorCode">PetscErrorCode</A> <A HREF="../MatOrderings/MatMeshToCellGraph.html#MatMeshToCellGraph">MatMeshToCellGraph</A>(<A HREF="../Mat/Mat.html#Mat">Mat</A> mesh,<A HREF="../Sys/PetscInt.html#PetscInt">PetscInt</A> ncommonnodes,<A HREF="../Mat/Mat.html#Mat">Mat</A> *dual)
</PRE>
Collective on <A HREF="../Mat/Mat.html#Mat">Mat</A>
<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>mesh </B></TD><TD>- the graph that represents the mesh
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>ncommonnodes </B></TD><TD>- mesh elements that share this number of common nodes are considered neighbors, use 2 for triangles and
quadrilaterials, 3 for tetrahedrals and 4 for hexahedrals
</TD></TR></TABLE>
<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>dual </B></TD><TD>- the dual graph
</TD></TR></TABLE>
<P>
<H3><FONT COLOR="#CC3333">Notes</FONT></H3>
Currently requires ParMetis to be installed and uses ParMETIS_V3_Mesh2Dual()
<P>
<pre>
Each row of the mesh object represents a single cell in the mesh. For triangles it has 3 entries, quadrilaterials 4 entries,
</pre>
<pre>
tetrahedrals 4 entries and hexahedrals 8 entries. You can mix triangles and quadrilaterals in the same mesh, but cannot
</pre>
<pre>
mix tetrahedrals and hexahedrals
</pre>
<pre>
The columns of each row of the <A HREF="../Mat/Mat.html#Mat">Mat</A> mesh are the global vertex numbers of the vertices of that row's cell.
</pre>
<pre>
The number of rows in mesh is number of cells, the number of columns is the number of vertices.
</pre>
<P>
<P>
<P>
<H3><FONT COLOR="#CC3333">See Also</FONT></H3>
<A HREF="../MatOrderings/MatMeshToVertexGraph.html#MatMeshToVertexGraph">MatMeshToVertexGraph</A>(), <A HREF="../Mat/MatCreateMPIAdj.html#MatCreateMPIAdj">MatCreateMPIAdj</A>(), <A HREF="../MatOrderings/MatPartitioningCreate.html#MatPartitioningCreate">MatPartitioningCreate</A>()
<BR>
<P>
<P>
<P><B></B><H3><FONT COLOR="#CC3333">Level</FONT></H3>advanced<BR>
<H3><FONT COLOR="#CC3333">Location</FONT></H3>
</B><A HREF="../../../src/mat/partition/impls/pmetis/pmetis.c.html#MatMeshToCellGraph">src/mat/partition/impls/pmetis/pmetis.c</A>
<P><H3><FONT COLOR="#CC3333">Examples</FONT></H3>
<A HREF="../../../src/mat/tutorials/ex11.c.html">src/mat/tutorials/ex11.c.html</A><BR>
<BR><A HREF="./index.html">Index of all MatOrderings routines</A>
<BR><A HREF="../../index.html">Table of Contents for all manual pages</A>
<BR><A HREF="../singleindex.html">Index of all manual pages</A>
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