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<html>
<head>
<title>
GRF_IO - Read and Write GRF Files
</title>
</head>
<body bgcolor="#EEEEEE" link="#CC0000" alink="#FF3300" vlink="#000055">
<h1 align = "center">
GRF_IO <br> GRF files <br> Read and Write Utilities
</h1>
<hr>
<p>
<b>GRF_IO</b>
is a FORTRAN90 library which
reads or writes a GRF file containing information about
an abstract graph.
</p>
<p>
The file includes information about
<ul>
<li>
<i>adjacency</i>, that is, which nodes are connected to a given node;
</li>
<li>
<i>embedding</i>, that is, how to place each node in the unit square so that
a drawing of the graph is visually pleasing and "readable".
</li>
</ul>
</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>GRF_IO</b> is available in
<a href = "../../cpp_src/grf_io/grf_io.html">a C++ version</a> and
<a href = "../../f_src/grf_io/grf_io.html">a FORTRAN90 version</a> and
<a href = "../../m_src/grf_io/grf_io.html">a MATLAB version</a>.
</p>
<h3 align = "center">
Related Data and Programs:
</h3>
<p>
<a href = "../../f_src/floyd/floyd.html">
FLOYD</a>,
a FORTRAN90 library which
implements Floyd's algorithm for finding the shortest distance between pairs of
nodes on a directed graph.
</p>
<p>
<a href = "../../datasets/graffiti/graffiti.html">
GRAFFITI</a>,
a dataset directory which
contains 195 abstract graphs, with adjacency and embedding information,
stored in the GRF format.
</p>
<p>
<a href = "../../data/graph_representation/graph_representation.html">
GRAPH_REPRESENTATION</a>,
a data directory which
contains examples of ways of representing abstract
mathematical graphs
</p>
<p>
<a href = "../../data/grf/grf.html">
GRF</a>,
a data directory which
contains a description of the GRF format and some examples.
</p>
<p>
<a href = "../../m_src/grf_display/grf_display.html">
GRF_DISPLAY</a>,
a MATLAB program which
reads a GRF file defining a mathematical graph and
displays it in the MATLAB graphics window.
</p>
<p>
<a href = "../../cpp_src/grf_display_opengl/grf_display_opengl.html">
GRF_DISPLAY_OPENGL</a>,
a C++ program which
reads a GRF file defining a mathematical graph and
displays it in an OpenGL graphics window.
</p>
<p>
<a href = "../../f_src/grf_to_eps/grf_to_eps.html">
GRF_TO_EPS</a>,
a FORTRAN90 program which
can make an encapsulated PostScript image of a GRF file.
</p>
<p>
<a href = "../../f_src/grf_to_xyl/grf_to_xyl.html">
GRF_TO_XYL</a>,
a FORTRAN90 program which
converts information describing the adjacency and embedding of an
abstract graph from GRF to XYL format.
</p>
<h3 align = "center">
Reference:
</h3>
<p>
<ol>
<li>
Peter Eades, Ian Fogg, David Kelly,<br>
SPREMB: A System for Developing Graph Algorithms,<br>
Congressus Numerantium,<br>
Volume 66, December 1988.
</li>
<li>
Stephen Skiena,<br>
Implementing Discrete Mathematics:
Combinatorics and Graph Theory in Mathematica,<br>
Addison Wesley, 1990.
</li>
<li>
<a href = "http://www.combinatorica.com/">
http://www.combinatorica.com/<a> <br>
the COMBINATORICA web page.
</li>
</ol>
</p>
<h3 align = "center">
Source Code:
</h3>
<p>
<ul>
<li>
<a href = "grf_io.f90">grf_io.f90</a>, the source code.
</li>
<li>
<a href = "grf_io.sh">grf_io.sh</a>,
commands to compile the source code.
</li>
</ul>
</p>
<h3 align = "center">
Examples and Tests:
</h3>
<p>
<ul>
<li>
<a href = "grf_io_prb.f90">grf_io_prb.f90</a>,
a sample calling program.
</li>
<li>
<a href = "grf_io_prb.sh">grf_io_prb.sh</a>,
commands to compile, link and run the sample calling program.
</li>
<li>
<a href = "grf_io_prb_output.txt">grf_io_prb_output.txt</a>,
the output file.
</li>
<li>
<a href = "coxeter.grf">coxeter.grf</a>,
a GRF file created by one test and read by another.
</li>
</ul>
</p>
<h3 align = "center">
List of Routines:
</h3>
<p>
<ul>
<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 ( kind = 4 ) value of a base 10 digit.
</li>
<li>
<b>DIGIT_TO_CH</b> returns the character representation of a decimal digit.
</li>
<li>
<b>GET_UNIT</b> returns a free FORTRAN unit number.
</li>
<li>
<b>GRF_DATA_PRINT</b> prints the data of a GRF file.
</li>
<li>
<b>GRF_DATA_READ</b> reads the data of a GRF file.
</li>
<li>
<b>GRF_DATA_WRITE</b> prints the data to a GRF file.
</li>
<li>
<b>GRF_EXAMPLE</b> sets up a GRF example.
</li>
<li>
<b>GRF_EXAMPLE_SIZE</b> sizes a GRF example.
</li>
<li>
<b>GRF_HEADER_PRINT</b> prints the header of a GRF file.
</li>
<li>
<b>GRF_HEADER_READ</b> reads the header of a GRF file.
</li>
<li>
<b>GRF_HEADER_WRITE</b> writes the header of a GRF file.
</li>
<li>
<b>GRF_WRITE</b> writes a GRF file.
</li>
<li>
<b>S_TO_I4</b> reads an integer value from a string.
</li>
<li>
<b>S_TO_R8</b> reads an R8 value from a string.
</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 12 January 2009.
</i>
<!-- John Burkardt -->
</body>
</html>