ASA245
Logarithm of Gamma Function


ASA245, a C++ library which evaluates the logarithm of the gamma function.

ASA245 is Applied Statistics Algorithm 245.

Licensing:

The computer code and data files described and made available on this web page are distributed under the GNU LGPL license.

Languages:

ASA245 is available in a C version and a C++ version and a FORTRAN90 version and a MATLAB version.

Related Data and Programs:

asa245_test

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

GSL, a C++ library which includes many routines for evaluating special functions.

TEST_VALUES, a C++ library which contains sample values for a number of distributions.

TOMS291, a C++ library 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:


Last revised on 31 January 2020.