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<html>
<head>
<title>
ASA147 - the Incomplete Gamma Function
</title>
</head>
<body bgcolor="#EEEEEE" link="#CC0000" alink="#FF3300" vlink="#000055">
<h1 align = "center">
ASA147 <br> the Incomplete Gamma Function
</h1>
<hr>
<p>
<b>ASA147</b>
is a C++ library which
evaluates the incomplete Gamma function.
</p>
<p>
<b>ASA147</b> is Applied Statistics Algorithm 147. Source code for many
Applied Statistics Algorithms is available through
<a href = "http://lib.stat.cmu.edu/apstat">STATLIB</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>ASA147</b> is available in
<a href = "../../c_src/asa147/asa147.html">a C version</a> and
<a href = "../../cpp_src/asa147/asa147.html">a C++ version</a> and
<a href = "../../f77_src/asa147/asa147.html">a FORTRAN77 version</a> and
<a href = "../../f_src/asa147/asa147.html">a FORTRAN90 version</a> and
<a href = "../../m_src/asa147/asa147.html">a MATLAB version</a>.
</p>
<h3 align = "center">
Related Data and Programs:
</h3>
<p>
<a href = "../../cpp_src/asa032/asa032.html">
ASA032</a>,
a C++ library which
evaluates the incomplete Gamma function.
</p>
<p>
<a href = "../../cpp_src/asa239/asa239.html">
ASA239</a>,
a C++ library which
evaluates the incomplete Gamma function.
</p>
<p>
<a href = "../../cpp_src/dcdflib/dcdflib.html">
DCDFLIB</a>,
a C++ library which
evaluates and inverts a number of statistical distributions.
</p>
<p>
<a href = "../../cpp_src/gsl/gsl.html">
GSL</a>,
a C++ library which
includes many routines for evaluating
probability distributions.
</p>
<p>
<a href = "../../cpp_src/prob/prob.html">
PROB</a>,
a C++ library which
evaluates and inverts a number of probabilistic distributions.
</p>
<p>
<a href = "../../cpp_src/test_values/test_values.html">
TEST_VALUES</a>,
a C++ library which
contains sample values for a number of distributions.
</p>
<p>
<a href = "../../f77_src/toms435/toms435.html">
TOMS435</a>,
a FORTRAN77 library which
evaluates the modified incomplete Gamma function.
</p>
<p>
<a href = "../../f_src/toms708/toms708.html">
TOMS708</a>,
a FORTRAN90 library which
includes routines to evaluate the incomplete Gamma function.
</p>
<h3 align = "center">
Reference:
</h3>
<p>
<ol>
<li>
Chi Leung Lau,<br>
Algorithm AS 147:
A Simple Series for the Incomplete Gamma Integral,<br>
Applied Statistics,<br>
Volume 29, Number 1, 1980, pages 113-114.
</li>
</ol>
</p>
<h3 align = "center">
Source Code:
</h3>
<p>
<ul>
<li>
<a href = "asa147.cpp">asa147.cpp</a>, the source code.
</li>
<li>
<a href = "asa147.hpp">asa147.hpp</a>, the include file.
</li>
<li>
<a href = "asa147.sh">asa147.sh</a>,
commands to compile the source code.
</li>
</ul>
</p>
<h3 align = "center">
Examples and Tests:
</h3>
<p>
<ul>
<li>
<a href = "asa147_prb.cpp">asa147_prb.cpp</a>,
a sample calling program.
</li>
<li>
<a href = "asa147_prb.sh">asa147_prb.sh</a>,
commands to compile and run the sample program.
</li>
<li>
<a href = "asa147_prb_output.txt">asa147_prb_output.txt</a>,
the output file.
</li>
</ul>
</p>
<h3 align = "center">
List of Routines:
</h3>
<p>
<ul>
<li>
<b>ALNGAM</b> computes the logarithm of the gamma function.
</li>
<li>
<b>GAMMA_INC_VALUES</b> returns some values of the incomplete Gamma function.
</li>
<li>
<b>GAMMDS</b> computes the incomplete Gamma integral.
</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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