asa239, a FORTRAN77 code which evaluates the incomplete Gamma function, by Shea.
This is a version of Applied Statistics Algorithm 239.
The computer code and data files described and made available on this web page are distributed under the MIT license
asa239 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.
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Original FORTRAN77 version by B Shea; This version by John Burkardt.