On Tue, Jul 15, 2008 at 3:27 AM, Mark Dickinson <[EMAIL PROTECTED]> wrote: > One reason is that they're probably not available on all platforms; > these functions > are part of the C99 standard, and not everyone has caught up with all the > little > details of C99 yet. In particular, I wouldn't be surprised to learn > that these functions > still weren't available on Windows. We had this problem when adding the > inverse hyperbolic trig functions to Python 2.6.
Indeed, they aren't available on Windows (I just tested it via ctypes). > Writing explicit code for these functions, for platforms whose libm doesn't > support them, would be a fairly major task. Stealing code (in an > appropriately > legal fashion) from somewhere else might work. This would be great. I need these functions pretty regularly (to compute the CDF of normal and beta distributions), and it'd be wonderful if I didn't have dive into C just to generate some values for a plot. I suggest using the versions from newlib's libm. They contain extensive comments explaining the math and have a generous license, e.g.,: http://sourceware.org/cgi-bin/cvsweb.cgi/~checkout~/src/newlib/libm/math/s_erf.c?rev=1.1.1.1&cvsroot=src -- Daniel Stutzbach, Ph.D. President, Stutzbach Enterprises LLC _______________________________________________ Python-3000 mailing list Python-3000@python.org http://mail.python.org/mailman/listinfo/python-3000 Unsubscribe: http://mail.python.org/mailman/options/python-3000/archive%40mail-archive.com
