asa310, a FORTRAN90 code which computes the cumulative density function (CDF) of the noncentral Beta distribution, by Chattamvelli and Shanmugam.
The code is Applied Statistics Algorithm 310.
Note: I could not get this algorithm to perform properly until I had made a number of modifications.
Note that the printed text of the algorithm, and the online version distributed by APSTAT, omit a crucial initialization of the variable S to zero.
Moreover, there are two typographical errors introduced into the online version distributed by APSTAT; in both cases a multiplication symbol became a minus sign.
Finally, note that the authors of AS310 invoke AS226, but specifically recommend that the changes submitted by Frick NOT be included. The version of AS226 distributed by APSTAT includes the Frick changes; the version of AS310 distributed by APSTAT includes this copy of AS226, and hence the changes suggested by Frick.
The computer code and data files described and made available on this web page are distributed under the GNU LGPL license.
asa310 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 R Chattamvelli, R Shanmugam; FORTRAN90 version by John Burkardt.