[R] Precision of values > 53 bits

[peter dalgaard]

This got revived by a long-standing bug in Mail.app on Mac: If you sort mails newest-last, it may unpredictably scroll back, often by several years. If you happen to have a large mailbox with some old unread mails in it, say from a mailing list, and don't pay attention to the date....

-pd
 
> On 25 Jul 2017, at 07:25 , Jeff Newmiller <jdnewmil at dcn.davis.ca.us> wrote:
> 
> What an impressively zombified thread. Though wondering how 53 bits were supposed to fit into 32 might just warrant revivification.
> -- 
> Sent from my phone. Please excuse my brevity.
> 
> On July 20, 2017 5:33:34 AM PDT, peter dalgaard <pdalgd at gmail.com> wrote:
>> 
>>> On 10 Jan 2013, at 15:56 , S Ellison <S.Ellison at lgcgroup.com> wrote:
>>> 
>>> 
>>> 
>>>> I am working with large numbers and identified that R looses 
>>>> precision for such high numbers.
>>> Yes. R uses standard 32-bit double precision.
>> 
>> 
>> Well, for large values of 32... such as 64.

-- 
Peter Dalgaard, Professor,
Center for Statistics, Copenhagen Business School
Solbjerg Plads 3, 2000 Frederiksberg, Denmark
Phone: (+45)38153501
Office: A 4.23
Email: pd.mes at cbs.dk  Priv: PDalgd at gmail.com