On Mon, Jun 18, 2018, 19:25 Chris Barker via Python-ideas < python-ideas@python.org> wrote:
> On Sat, Jun 16, 2018 at 10:57 PM, Tim Peters <tim.pet...@gmail.com> wrote: > > Ya, decimal fp doesn't really solve anything except the shallow surprise >> that decimal fractions generally aren't exactly representable as binary >> fractions. Which is worth a whole lot for casual users, but doesn't >> address any of the deep problems (to the contrary, it makes those a bit >> worse). >> > > It's my suspicion that the story is the same with "degree-based" trig :-) > > Which is why, if you want "nice-looking" results, it seems one could > simply accept a decimal digit or so less precision, and use the "regular" > FP trig functions, rounding to 14 or so decimal digits. > > Though if someone really wants to implement trig in native degrees -- more > power to 'em. > > However -- if this is really such a good idea -- wouldn't someone have > make a C lib that does it? Or has someone? Anyone looked? > quite a few in fact, including cos(n*pi) https://www.boost.org/doc/libs/1_52_0/boost/units/cmath.hpp > -CHB > > > -- > > Christopher Barker, Ph.D. > Oceanographer > > Emergency Response Division > NOAA/NOS/OR&R (206) 526-6959 voice > 7600 Sand Point Way NE (206) 526-6329 fax > Seattle, WA 98115 (206) 526-6317 main reception > > chris.bar...@noaa.gov > _______________________________________________ > Python-ideas mailing list > Python-ideas@python.org > https://mail.python.org/mailman/listinfo/python-ideas > Code of Conduct: http://python.org/psf/codeofconduct/ >
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