asa147, a FORTRAN90 code which evaluates the incomplete Gamma function, by Chi Leung Lau.
The code is Applied Statistics Algorithm 147.
The computer code and data files described and made available on this web page are distributed under the GNU LGPL license.
asa147 is available in a C version and a C++ version and a FORTRAN90 version and a MATLAB version.
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Original FORTRAN77 version by Chi Leung Lau; FORTRAN90 version by John Burkardt.