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<html>
<head>
<title>
TSP_IO - Read or Write Traveling Salesman Problem (TSP) Files
</title>
</head>
<body bgcolor="#EEEEEE" link="#CC0000" alink="#FF3300" vlink="#000055">
<h1 align = "center">
TSP_IO <br> Read or Write Traveling Salesman Problem (TSP) Files
</h1>
<hr>
<p>
<b>TSP_IO</b>
is a FORTRAN90 library which
is intended to be used to read or write some of the formats used
in TSPLIB, a collection of traveling salesman problems stored in
a particular format known as "TSP".
</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">
Related Data and Programs:
</h3>
<p>
<a href = "../../datasets/cities/cities.html">
CITIES</a>,
a dataset directory which
contains sets of information about cities and the distances between them;
</p>
<p>
<a href = "../../f_src/cities/cities.html">
CITIES</a>,
a FORTRAN90 library which
handles various problems associated with a set of "cities" on a map.
</p>
<p>
<a href = "../../datasets/tsp/tsp.html">
TSP</a>,
a dataset directory which
contains test data for the traveling salesperson problem;
</p>
<h3 align = "center">
Reference:
</h3>
<p>
<ol>
<li>
Gerhard Reinelt,<br>
TSPLIB - A Traveling Salesman Problem Library,<br>
ORSA Journal on Computing,<br>
Volume 3, Number 4, Fall 1991, pages 376-384.
</li>
</ol>
</p>
<h3 align = "center">
Source Code:
</h3>
<p>
<ul>
<li>
<a href = "tsp_io.f90">tsp_io.f90</a>, the source code.
</li>
<li>
<a href = "tsp_io.sh">tsp_io.sh</a>,
BASH commands to compile the source code.
</li>
</ul>
</p>
<h3 align = "center">
Examples and Tests:
</h3>
<p>
<ul>
<li>
<a href = "tsp_io_prb.f90">tsp_io_prb.f90</a>,
a sample calling program.
</li>
<li>
<a href = "tsp_io_prb.sh">tsp_io_prb.sh</a>,
BASH commands to compile and run the sample program.
</li>
<li>
<a href = "tsp_io_prb_output.txt">tsp_io_prb_output.txt</a>,
the output file.
</li>
</ul>
</p>
<p>
<b>P01</b> is a small example of 15 cities.
<ul>
<li>
<a href = "../../datasets/tsp/p01.tsp">p01.tsp</a>,
the TSP file.
</li>
<li>
<a href = "../../datasets/tsp/p01_d.txt">p01_d.txt</a>,
the distance table file created by TSP_IO_PRB.
</li>
</ul>
</p>
<p>
<b>ATT48</b> is a classic example of 48 cities.
<ul>
<li>
<a href = "../../datasets/tsp/att48.tsp">att48.tsp</a>,
the TSP file.
</li>
<li>
<a href = "../../datasets/tsp/att48_d.txt">att48_d.txt</a>,
the distance table file created by TSP_IO_PRB.
</li>
</ul>
</p>
<h3 align = "center">
List of Routines:
</h3>
<p>
<ul>
<li>
<b>CH_CAP</b> capitalizes a single character.
</li>
<li>
<b>GET_UNIT</b> returns a free FORTRAN unit number.
</li>
<li>
<b>I4MAT_PRINT</b> prints an I4MAT.
</li>
<li>
<b>I4MAT_PRINT_SOME</b> prints some of an I4MAT.
</li>
<li>
<b>I4MAT_WRITE</b> writes an I4MAT file.
</li>
<li>
<b>PSEUDO_EUCLIDEAN_DISTANCE</b> computes the distance used for the ATT example.
</li>
<li>
<b>S_EQI</b> is a case insensitive comparison of two strings for equality.
</li>
<li>
<b>S_TO_I4</b> reads an integer value from a string.
</li>
<li>
<b>S_WORD_EXTRACT_FIRST</b> extracts the first word from a string.
</li>
<li>
<b>TEXT_SPLIT</b> uses a colon to locate the keyword and field in a line of text.
</li>
<li>
<b>TIMESTAMP</b> prints the current YMDHMS date as a time stamp.
</li>
<li>
<b>TSP_EDGE_WEIGHT_READ</b> reads the edge weights of a TSP file.
</li>
<li>
<b>TSP_HEADER_READ</b> reads the header of a TSP file.
</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 01 November 2010.
</i>
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