[R] long integer handling

[Rui Barradas]

Hello,

I forgot to suggest package gmp. See the second example in

?gmp::bigz

Hope this helps,

Rui Barradas

Às 05:50 de 14/11/20, Rui Barradas escreveu:
> Hello,
> 
> You can compute the exact result with package Rmpfr.
> See ?mpfr and [1].
> 
> 
> library(Rmpfr)
> 
> two <- mpfr(2, precBits = 64)
> two^64 - 1
> #1 'mpfr' number of precision  64   bits
> #[1] 18446744073709551615
> 
> 
> 
> [1] https://www.mpfr.org/
> 
> Hope this helps,
> 
> Rui Barradas
> 
> Às 01:44 de 14/11/20, Yousri Fanous escreveu:
>> I want to calculate 2^64-1 which is
>> 18446744073709551615
>>
>> I set the following options to prevent scientific notation
>> options("scipen"=100, "digits"=4)
>>> x<-2^64 -1
>>> x
>> [1] 18446744073709551616
>>
>> This is not correct. There seem to be still some approximation happening.
>> How can I get the correct result?
>>
>> Yousri
>> IBM Canada ltd
>> Software developer
>>
>>     [[alternative HTML version deleted]]
>>
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>> http://www.R-project.org/posting-guide.html
>> and provide commented, minimal, self-contained, reproducible code.
>>
> 
> ______________________________________________
> R-help using r-project.org mailing list -- To UNSUBSCRIBE and more, see
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide 
> http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.