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<html>
<head>
<title>
TOMS291 - Approximate Log(Gamma(X))
</title>
</head>
<body bgcolor="#EEEEEE" link="#CC0000" alink="#FF3300" vlink="#000055">
<h1 align = "center">
TOMS291 <br> Approximate Log(Gamma(X))
</h1>
<hr>
<p>
<b>TOMS291</b>
is a C++ program which
approximates the logarithm of the Gamma function.
</p>
<p>
The text of many ACM TOMS algorithms is available online
through ACM:
<a href = "http://www.acm.org/pubs/calgo/">
http://www.acm.org/pubs/calgo</a>
or NETLIB:
<a href = "http://www.netlib.org/toms/index.html">
http://www.netlib.org/toms/index.html</a>.
</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>TOMS291</b> is available in
<a href = "../../c_src/toms291/toms291.html">a C version</a> and
<a href = "../../cpp_src/toms291/toms291.html">a C++ version</a> and
<a href = "../../f77_src/toms291/toms291.html">a FORTRAN77 version</a> and
<a href = "../../f_src/toms291/toms291.html">a FORTRAN90 version</a> and
<a href = "../../m_src/toms291/toms291.html">a MATLAB version</a>.
</p>
<h3 align = "center">
Related Data and Programs:
</h3>
<p>
<a href = "../../cpp_src/asa245/asa245.html">
ASA245</a>,
a C++ library which
evaluates the logarithm of the Gamma function.
</p>
<p>
<a href = "../../cpp_src/gsl/gsl.html">
GSL</a>,
a C++ library which
evaluates many special functions, including the logarithm of the Gamma function.
</p>
<p>
<a href = "../../cpp_src/polpak/polpak.html">
POLPAK</a>,
a C++ library which
evaluates a variety of special functions.
</p>
<p>
<a href = "../../f77_src/specfun/specfun.html">
SPECFUN</a>,
a FORTRAN77 library which
evaluates a variety of special functions.
</p>
<p>
<a href = "../../cpp_src/test_values/test_values.html">
TEST_VALUES</a>,
a C++ library which
tabulates several values of a variety of special functions.
</p>
<p>
<a href = "../../f_src/toms708/toms708.html">
TOMS708</a>,
a FORTRAN90 library which
evaluates several special functions, including the logarithm of the Gamma function.
</p>
<h3 align = "center">
Reference:
</h3>
<p>
<ol>
<li>
Malcolm Pike, David Hill,<br>
Algorithm 291:
Logarithm of Gamma Function,<br>
Communications of the ACM,<br>
Volume 9, Number 9, September 1966, page 684.
</li>
</ol>
</p>
<h3 align = "center">
Source Code:
</h3>
<p>
<ul>
<li>
<a href = "toms291.cpp">toms291.cpp</a>, the source code.
</li>
<li>
<a href = "toms291.hpp">toms291.hpp</a>, the include file.
</li>
<li>
<a href = "toms291.sh">toms291.sh</a>,
commands to compile the source code.
</li>
</ul>
</p>
<h3 align = "center">
Examples and Tests:
</h3>
<p>
<ul>
<li>
<a href = "toms291_prb.cpp">toms291_prb.cpp</a>,
a sample calling program.
</li>
<li>
<a href = "toms291_prb.sh">toms291_prb.sh</a>,
commands to compile and run the sample program.
</li>
<li>
<a href = "toms291_prb_output.txt">toms291_prb_output.txt</a>,
the output file.
</li>
</ul>
</p>
<h3 align = "center">
List of Routines:
</h3>
<p>
<ul>
<li>
<b>ALOGAM</b> computes the logarithm of the Gamma function.
</li>
<li>
<b>GAMMA_LOG_VALUES</b> returns some values of the Log Gamma function.
</li>
<li>
<b>TIMESTAMP</b> prints out the current YMDHMS date as a timestamp.
</li>
</ul>
</p>
<p>
You can go up one level to <a href = "../cpp_src.html">
the C++ source codes</a>.
</p>
<hr>
<i>
Last revised on 22 January 2008.
</i>
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