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
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