asa063, a FORTRAN90 code which evaluates the incomplete Beta function, by KL Majumder and G Bhattacharjee.
The code is Applied Statistics Algorithm 63.
The computer code and data files described and made available on this web page are distributed under the MIT license
asa063 is available in a C version and a C++ version and a FORTRAN90 version and a MATLAB version and a Python version.
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Original FORTRAN77 version by KL Majumder, GP Bhattacharjee; FORTRAN90 version by John Burkardt.