How to make R more precise?

Question

When I plug these equations into R I get:

> 1/(1+exp(-18))
[1] 1
> 1/(1+exp(-16))
[1] 0.9999999

But when I plug the same equations into Chrome I get:

1/(1+exp(-18))
0.99999998477 

1/(1+exp(-16))
0.99999988746

So it seems like R is not very precise and rounds numbers up. Is it possible for me to get more digit precision with R? If so, how can I do that?

Helpful: https://stackoverflow.com/questions/2053397/long-bigint-decimal-equivalent-datatype-in-r — Tim Biegeleisen, May 07 '18 at 15:20
Type `options(digits= 11)` and recompute. R just does not display so many digits by default. — G5W, May 07 '18 at 15:24

score 1 · Answer 1 · answered May 07 '18 at 15:26

1

Thanks to user G5W, I realized I needed to do:

options(digits=11)

And rerun my exp() equations. B/c by default R does not display so many digits.

answered May 07 '18 at 15:26

14wml

1 Answers1