Re: [R] Precision of values > 53 bits

2017-07-25 Thread 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 >

Re: [R] Precision of values > 53 bits

2017-07-24 Thread Jeff Newmiller
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 wrote: > >> On 10 Jan 2013, at 15:56 , S

Re: [R] Precision of values > 53 bits

2017-07-20 Thread Ted Harding
On Thu, 2017-07-20 at 14:33 +0200, peter dalgaard wrote: > > On 10 Jan 2013, at 15:56 , S Ellison wrote: > > > > > > > >> I am working with large numbers and identified that R looses > >> precision for such high numbers. > > Yes. R uses standard 32-bit double

Re: [R] Precision of values > 53 bits

2017-07-20 Thread peter dalgaard
> On 10 Jan 2013, at 15:56 , S Ellison 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,

[R] Precision of values 53 bits

2013-01-10 Thread Stephan Mueller
Hi, I am working with large numbers and identified that R looses precision for such high numbers. The precision is lost exactly when the number is equal or larger than 53 bits. See the following output which shows that the numbers below 53 bit have proper precision: 2^53 [1] 9007199254740992

[R] Precision of values 53 bits

2013-01-10 Thread Stephan Mueller
Hi, I am working with large numbers and identified that R looses precision for such high numbers. The precision is lost exactly when the number is equal or larger than 53 bits. See the following output which shows that the numbers below 53 bit have proper precision: 2^53 [1] 9007199254740992

Re: [R] Precision of values 53 bits

2013-01-10 Thread R. Michael Weylandt
Perhaps here?: https://r-forge.r-project.org/projects/rmpfr/ M On Thu, Jan 10, 2013 at 10:58 AM, Stephan Mueller stephan.muel...@atsec.com wrote: I am working with large numbers and identified that R looses precision for such high numbers. The precision is lost exactly when the number is

Re: [R] Precision of values 53 bits

2013-01-10 Thread S Ellison
I am working with large numbers and identified that R looses precision for such high numbers. Yes. R uses standard 32-bit double precision. See ?double in your R help system. And welcome to finite precision arithmetic, which is a very widely known issue in digital comuting ever since it

Re: [R] Precision of values 53 bits

2013-01-10 Thread Duncan Murdoch
On 13-01-10 6:01 AM, Stephan Mueller wrote: Hi, I am working with large numbers and identified that R looses precision for such high numbers. The precision is lost exactly when the number is equal or larger than 53 bits. See the following output which shows that the numbers below 53 bit have

Re: [R] Precision of values 53 bits

2013-01-10 Thread jim holtman
FAQ 7.31 On Thursday, January 10, 2013, Stephan Mueller smuel...@atsec.com wrote: Hi, I am working with large numbers and identified that R looses precision for such high numbers. The precision is lost exactly when the number is equal or larger than 53 bits. See the following output which