asa239, a FORTRAN90 code which evaluates the incomplete Gamma function, by Shea.
The code is 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 a Python version.
asa032, a FORTRAN90 code which evaluates the incomplete Gamma function.
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Original FORTRAN77 version by B Shea; FORTRAN90 version by John Burkardt.