Le 15/08/2012 16:58, Sébastien Brisard a écrit : > Dear All, > I'm currently working on accuracy improvements of the incomplete beta > function, based on the NSWC library [1]. It's quite a long work, but it > looks promising, since the implementation of the Gamma function they > propose (I had to work first on Gamma before starting the actual work on > Beta) seems to be much more accurate than the current implementation in CM3 > (3-4 ulps, TBC). > > When I'm done, I think I will replace the current impl of Gamma with the > NSWC. The problem is that a few months ago, while working on MATH-753, I > exposed a few constants as well as the method lanczos, which will probably > no longer be necessary (NSWC does not use Lanczos, but minimax rational > approximations). My worry is that we are approaching the release of 3.1, > and I think it would be a shame if we froze the exposition of these > constants and methods. The trouble is that my current work on Gamma and > Beta is quite slow, I'm not sure I can finish it before the expected > release. > > So, should I revert the changes made for MATH-753, and reopen this issue? > This would allow the removal of method lanczos and constant LANCZOS_G, > which would lay out the path to the new implementation. Alternatively, I > can deprecate these fields.
If these fileds cannot be made private, then +1 to deprecate them and explain in the doc this implementation is a temporary one to solve the issue and will be replaced by a new one for 4.0. Luc > > What do you think? > > > [1] http://www.ualberta.ca/CNS/RESEARCH/Software/NumericalNSWC/site.html > [2] https://issues.apache.org/jira/browse/MATH-753 > --------------------------------------------------------------------- To unsubscribe, e-mail: dev-unsubscr...@commons.apache.org For additional commands, e-mail: dev-h...@commons.apache.org
