How about adding rational fraction to Python?
Mark Dickinson
dickinsm at gmail.com
Tue Mar 4 09:39:42 EST 2008
On Mar 4, 8:46 am, NickC <ncogh... at gmail.com> wrote:
> The increased number of inaccurate answers with Decimal (31% vs 10%)
> is probably due to the fact that it is actually more precise than
> float
I suspect it has more to do with the fact that 10 is bigger than 2,
though I'm not sure I could precisely articulate the reasons why
this matters. (A bigger base means a bigger 'wobble', the wobble
being the variation in the relationship between an error of 1ulp and
a relative error of base**-precision.)
Rerunning your example after a
getcontext().prec = 16
(i.e. with precision comparable to that of float) gives
>>> check_accuracy(Decimal)
310176
Mark
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