NAs produced by integer overflow + R on linux

Question

I\'m running an R script on UNIX based system , the script contain multiplication of large numbers , so the results where NAs by integer overflow , but when i run the same s

Answer 1

Given your comments, I guess that you seriously misunderstand the "correctness" of numbers in R. You say the outcome you get on Windows is something like -30598395869593930593. Now, on both 32bit and 64bit that precision is even not possible using a double, let alone using an integer :

> x <- -30598395869593930593
> format(x,scientific=F)
[1] "-30598395869593931776"
> all.equal(x,as.numeric(format(x,scientific=F)))
[1] TRUE
> as.integer(x)
[1] NA

You have 16 digits you can trust, all the rest is bollocks. Then again, an accuracy of 16 digits is already pretty strong. Most measurement tools don't even come close to that.