asa245

asa245, a C++ code which evaluates the logarithm of the gamma function, by Allan McLeod.

This is a version of Applied Statistics Algorithm 245.

Licensing:

The information on this web page is distributed under the MIT license.

Languages:

asa245 is available in a C version and a C++ version and a Fortran90 version and a MATLAB version and an Octave version and a Python version.

Related Data and Programs:

asa245_test

fn, a C++ code which approximates elementary and special functions using Chebyshev polynomials, by Wayne Fullerton.

gsl_test, a C++ code which includes many routines for evaluating special functions.

test_values, a C++ code which contains sample values for a number of distributions.

toms291, a C++ code which evaluates the logarithm of the Gamma function.

Reference:

1. Cornelius Lanczos,
   A precision approximation of the gamma function,
   SIAM Journal on Numerical Analysis, B,
   Volume 1, 1964, pages 86-96.
2. Allan Mcleod,
   Algorithm AS 245: A Robust and Reliable Algorithm for the Logarithm of the Gamma Function,
   Applied Statistics,
   Volume 38, Number 2, 1989, pages 397-402.

Source Code:

• asa245.cpp, the source code.
• asa245.sh, compiles the source code.
• asa245.hpp, the include file.