ASA245
Logarithm of Gamma Function


ASA245 is a C library which evaluates the logarithm of the gamma function, by Allan Mcleod;

ASA245 is Applied Statistics Algorithm 245. Source code for many Applied Statistics Algorithms is available through STATLIB.

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 FORTRAN77 version and a FORTRAN90 version and a MATLAB version.

Related Data and Programs:

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

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.

Author:

Original FORTRAN77 version by Allan Mcleod; C version by John Burkardt.

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:

Examples and Tests:

List of Routines:

You can go up one level to the C source codes.


Last revised on 20 November 2010.