ASA032
the Incomplete Gamma Function

ASA032 is a C library which evaluates the incomplete Gamma function, by G Bhattacharjee.

ASA032 is Applied Statistics Algorithm 32. 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:

ASA032 is available in a C version and a C++ version and a FORTRAN90 version and a MATLAB version.

Related Data and Programs:

asa032_test

ASA147, a C library which evaluates the incomplete Gamma function.

ASA239, a C library which evaluates the incomplete Gamma function.

PROB, a C library which evaluates and inverts a number of probabilistic distributions.

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

Author:

Original FORTRAN77 version by G Bhattacharjee; C version by John Burkardt.

Reference:

1. G Bhattacharjee,
   Algorithm AS 32: The Incomplete Gamma Integral,
   Applied Statistics,
   Volume 19, Number 3, 1970, pages 285-287.

Source Code:

• asa032.h, the include file.
• gamain.c, computes the incomplete gamma ratio.
• gamma_inc_values.c, returns some values of the incomplete Gamma function.
• timestamp.c, prints out the current YMDHMS date as a timestamp.