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 <stratm...@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
>
> --
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