This is the behavior of the floating point number representation.
Decimal fractions do not come out even in binary notation.
Please see FAQ 7.31

On Tue, Jul 10, 2012 at 4:17 PM, ollestrat <stratman1@gmx.de> wrote:

> Hello,
>
> I fear its a stupid question,..but here it is:
>
> If I do this simple calculation with the R  console, I surprisingly do not
> get a zero. Why?
>
>  -1.1-0.1+1.2
> [1] -2.220446e-16
>
>
> greetings, Ole
>
> --
> View this message in context:
> http://r.789695.n4.nabble.com/1-1-0-1-1-2-is-NOT-null-Why-tp4636053.html
> Sent from the R help mailing list archive at Nabble.com.
>         [[alternative HTML version deleted]]
>
> ______________________________________________
> 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.
>

	[[alternative HTML version deleted]]

