On 6/18/18 19:23, Chris Barker via Python-ideas wrote:
On Sat, Jun 16, 2018 at 10:57 PM, Tim Peters
<tim.pet...@gmail.com
<mailto: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?
Certainly! scipy.special uses the functions implemented in the Cephes C library.
--
Robert Kern
"I have come to believe that the whole world is an enigma, a harmless enigma
that is made terrible by our own mad attempt to interpret it as though it had
an underlying truth."
-- Umberto Eco
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