Mark Dickinson <dicki...@gmail.com> added the comment: nirinA: thanks for the erf patch. It's fine as far as it goes; the main technical issue is that the series development only converges at a sensible rate for smallish x; for larger x something more is needed.
Here's a prototype patch for the erf and erfc functions that uses a power series (not quite the same as the series nirinA used; by pulling out a factor of exp(-x*2) you can make all coefficients in the remaining series positive, which is good for the numerics) for small x, and a continued fraction expansion for larger x. The erf and erfc functions are currently written in Python. I'll do some more testing (and possibly tweaking) of this patch and then translate the Python to C. ---------- Added file: http://bugs.python.org/file15539/erf.patch _______________________________________ Python tracker <rep...@bugs.python.org> <http://bugs.python.org/issue3366> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
