[R] operators %/% bug?

[jim holtman]

FAQ 7.31

a-b != 0.2

> a <- 1.2
>
> b <- 1.0
>
> a-b-.2
[1] -5.551115e-17
>



On 3/31/08, Lo, Ken <Ken.Lo at roswellpark.org> wrote:
> Dear  all,
>
>
>
> I have come across a strange behavior of the %/% operator, and I wasn't
> sure if this was intended.
>
>
>
> i.e.
>
> a <- 1.2
>
> b <- 1.0
>
> (a-b) %/% 0.1  results in 1?
>
> Whereas
>
> 0.2 %/% 0.1 results in 2.
>
>
>
> Am I missing something obvious here?  It seems to be consistent up to R
> 2.6.0 running in WinXP (haven't upgraded yet).
>
>
>
> Best,
>
>
>
> Ken
>
>
>
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-- 
Jim Holtman
Cincinnati, OH
+1 513 646 9390

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