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<html>
<head>
<title>
NEIGHBORS_TO_METIS_GRAPH - Reformat Tet Mesh Neighbor File
</title>
</head>
<body bgcolor="#EEEEEE" link="#CC0000" alink="#FF3300" vlink="#000055">
<h1 align = "center">
NEIGHBORS_TO_METIS_GRAPH <br> Reformat Tet Mesh Neighbor File
</h1>
<hr>
<p>
<b>NEIGHBORS_TO_METIS_GRAPH</b>
is a FORTRAN90 program which
reads a file describing
the graph-theoretic adjacency structure of the
elements in a mesh of triangles or tetrahedrons and writes out a similar file
that is suitable for input to the mesh partitioning
program METIS.
</p>
<p>
Since we know we are dealing with a triangle or tet mesh, each "node" of
the adjacency graph has 3 or 4 potential edges. If a potential
edge is not used (in other words, if a face is a boundary face),
then by convention we write out a "-1" for the neighbor value.
Otherwise, the adjacency information lists the index of the
element that is a neighbor on that face of the
element
</p>
<p>
Converting to a METIS GRAPH format is trivial. We include
an initial line that lists the number of "nodes" (elements)
and "edges" (interfaces between pairs of elements), followed by,
for each node (element), a list of the adjacent nodes (a list
of the adjacent elements, omitting the "-1" values). A cross-eyed
schoolboy sitting on a tack would be able to carry out this task!
</p>
<h3 align = "center">
Usage:
</h3>
<p>
<dl>
<dt>
<b>neighbors_to_metis_graph</b> <i>neighbor_file</i>
</dt>
<dd>
reads the data in <i>neighbor_file</i>, rearranges it to
suit <b>METIS</b>, and writes out the modified data to
<i>metis_graph_file</i>
</dd>
</dl>
</p>
<h3 align = "center">
Licensing:
</h3>
<p>
The computer code and data files described and made available on this web page
are distributed under
<a href = "../../txt/gnu_lgpl.txt">the GNU LGPL license.</a>
</p>
<h3 align = "center">
Languages:
</h3>
<p>
<b>NEIGHBORS_TO_METIS_GRAPH</b> is available in
<a href = "../../cpp_src/neighbors_to_metis_graph/neighbors_to_metis_graph.html">a C++ version</a> and
<a href = "../../f_src/neighbors_to_metis_graph/neighbors_to_metis_graph.html">a FORTRAN90 version</a> and
<a href = "../../m_src/neighbors_to_metis_graph/neighbors_to_metis_graph.html">a MATLAB version</a>.
</p>
<h3 align = "center">
Related Programs:
</h3>
<p>
<a href = "../../c_src/graphchk/graphchk.html">
GRAPHCHK</a>,
a C program which
uses the METIS library to check
that a METIS graph file has the proper format;
</p>
<p>
<a href = "../../c_src/kmetis/kmetis.html">
KMETIS</a>,
a C program which
uses the METIS library to partition
the nodes of a graph in a balanced way, useful for parallel
processing;
</p>
<p>
<a href = "../../c_src/metis/metis.html">
METIS</a>,
a C library which
partitions the nodes of a graph or the elements of a mesh, for division among
a number of parallel processes, or to reorder the variables in a sparse
matrix to minimize fillin;
</p>
<p>
<a href = "../../data/metis_graph/metis_graph.html">
METIS_GRAPH</a>,
a data directory which
contains examples of METIS GRAPH files,
the format for graphs to be read by METIS,
which can partition a graph;
</p>
<p>
<a href = "../../c_src/oemetis/oemetis.html">
OEMETIS</a>,
a C program which
uses the METIS library to reorder
the variables in a sparse matrix.
</p>
<p>
<a href = "../../c_src/onmetis/onmetis.html">
ONMETIS</a>,
a C program which
uses the METIS library to reorder
the variables in a sparse matrix.
</p>
<p>
<a href = "../../f_src/tet_mesh_tet_neighbors/tet_mesh_tet_neighbors.html">
TET_MESH_TET_NEIGHBORS</a>,
a FORTRAN90 program which
reads information about a tet mesh and writes out a list of the
tetrahedrons that are adjacent to a given tetrahedron;
</p>
<p>
<a href = "../../f_src/triangulation_triangle_neighbors/triangulation_triangle_neighbors.html">
TRIANGULATION_TRIANGLE_NEIGHBORS</a>,
a FORTRAN90 program which
reads data defining a triangulation, determines the neighboring
triangles of each triangle, and writes that information to a file.
</p>
<h3 align = "center">
Reference:
</h3>
<p>
<ol>
<li>
George Karypis, Vipin Kumar,<br>
METIS, a Software Package for Partitioning Unstructured Graphs
and Computing Fill-Reduced Orderings of Sparse Matrices;
</li>
</ol>
</p>
<h3 align = "center">
Source Code:
</h3>
<p>
<ul>
<li>
<a href = "neighbors_to_metis_graph.f90">neighbors_to_metis_graph.f90</a>,
the source code.
</li>
<li>
<a href = "neighbors_to_metis_graph.sh">neighbors_to_metis_graph.sh</a>,
commands to compile the source code.
</li>
</ul>
</p>
<h3 align = "center">
Examples and Tests:
</h3>
<p>
<ul>
<li>
<a href = "cube_tetra.neighbors">cube_tetra.neighbors</a>,
a sample tet mesh neighbor file that can be used as input
to the program.
</li>
<li>
<a href = "cube_tetra.metis_graph">cube_tetra.metis_graph</a>,
the modified tet mesh neighbor file created by the program,
suitable for input to <b>METIS</b>.
</li>
</ul>
</p>
<h3 align = "center">
List of Routines:
</h3>
<p>
<ul>
<li>
<b>MAIN</b> is the main program for NEIGHBORS_TO_METIS_GRAPH.
</li>
<li>
<b>CH_CAP</b> capitalizes a single character.
</li>
<li>
<b>CH_EQI</b> is a case insensitive comparison of two characters for equality.
</li>
<li>
<b>CH_TO_DIGIT</b> returns the integer value of a base 10 digit.
</li>
<li>
<b>FILE_COLUMN_COUNT</b> counts the number of columns in the first line of a file.
</li>
<li>
<b>FILE_NAME_EXT_GET</b> determines the "extension" of a file name.
</li>
<li>
<b>FILE_NAME_EXT_SWAP</b> replaces the current "extension" of a file name.
</li>
<li>
<b>FILE_ROW_COUNT</b> counts the number of row records in a file.
</li>
<li>
<b>GET_UNIT</b> returns a free FORTRAN unit number.
</li>
<li>
<b>I4COL_COMPARE</b> compares columns I and J of a integer array.
</li>
<li>
<b>I4COL_SORT_A</b> ascending sorts an integer array of columns.
</li>
<li>
<b>I4COL_SWAP</b> swaps columns J1 and J2 of a integer array of column data.
</li>
<li>
<b>I4I4I4_SORT_A</b> ascending sorts a triple of integers.
</li>
<li>
<b>I4MAT_TRANSPOSE_PRINT</b> prints an I4MAT, transposed.
</li>
<li>
<b>I4MAT_TRANSPOSE_PRINT_SOME</b> prints some of the transpose of an I4MAT.
</li>
<li>
<b>ITABLE_DATA_READ</b> reads data from an integer table file.
</li>
<li>
<b>ITABLE_HEADER_READ</b> reads the header from an integer table file.
</li>
<li>
<b>METIS_GRAPH_WRITE</b> writes the METIS graph file.
</li>
<li>
<b>S_BLANK_DELETE</b> removes blanks from a string, left justifying the remainder.
</li>
<li>
<b>S_INDEX_LAST_C</b> finds the LAST occurrence of a given character.
</li>
<li>
<b>S_TO_I4</b> reads an integer value from a string.
</li>
<li>
<b>S_TO_I4VEC</b> reads an I4VEC from a string.
</li>
<li>
<b>S_WORD_COUNT</b> counts the number of "words" in a string.
</li>
<li>
<b>SORT_HEAP_EXTERNAL</b> externally sorts a list of items into ascending order.
</li>
<li>
<b>TIMESTAMP</b> prints the current YMDHMS date as a time stamp.
</li>
</ul>
</p>
<p>
You can go up one level to <a href = "../f_src.html">
the FORTRAN90 source codes</a>.
</p>
<hr>
<i>
Last revised on 15 October 2008.
</i>
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