Thank you! On Sat, Nov 14, 2020 at 12:54 AM Rui Barradas <ruipbarra...@sapo.pt> wrote:
> 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]] > >> > >> ______________________________________________ > >> R-help@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. > >> > > > > ______________________________________________ > > R-help@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. > [[alternative HTML version deleted]] ______________________________________________ R-help@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.
