> Where the value of exp(1) as computed by R is concerned, you have
> been deceived by what R displays ("prints") on screen. The default
> is to display any number to 7 digits of accuracy, but that is not
> the accuracy of the number held internally by R:
>
> exp(1)
> # [1] 2.718282
> exp(1) - 2.718282
> # [1] -1.715410e-07
I encourage anyone confused about this issue to study
http://en.wikipedia.org/wiki/The_Treachery_of_Images
And to watch
http://www.youtube.com/watch?v=ejweI0EQpX8
Hadley
--
Assistant Professor / Dobelman Family Junior Chair
Department of Statistics / Rice University
http://had.co.nz/
______________________________________________
R-help@r-project.org mailing list
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.
