For more details about floating-point:
http://docs.oracle.com/cd/E19957-01/806-3568/ncg_goldberg.html


2013/1/5 peter dalgaard <pdalgd@gmail.com>

>
> On Jan 5, 2013, at 20:30 , Rolf Turner wrote:
>
> > On 01/06/2013 07:42 AM, David Arnold wrote:
> >> Hi,
> >>
> >> Can someone explain this:
> >>
> >>> options(digits=20)
> >>> 1/3
> >> [1] 0.33333333333333331483
> >>
> >> Why the 1483 at the end?
> >
> > There are 10 sorts of people; those who understand binary
> > arithmetic and those who don't.  See also FAQ 7.31.
>
> Actually, it seems there are 11 sorts; those who understand binary, those
> who understand floating point binary, and those who do neither. The first
> 0.010101010101010101... of these would seem to the the issue here.
>
> (Or 1.0101010101...e-10 if you want to split hairs.)
>
> --
> Peter Dalgaard, Professor,
> Center for Statistics, Copenhagen Business School
> Solbjerg Plads 3, 2000 Frederiksberg, Denmark
> Phone: (+45)38153501
> Email: pd.mes@cbs.dk  Priv: PDalgd@gmail.com
>
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