[R] Comparing decimal numbers

[Stephan Kolassa]

Hi,

this is R FAQ 7.31.
http://cran.r-project.org/doc/FAQ/R-FAQ.html

HTH,
Stephan


Am 01.02.2011 14:49, schrieb mlancee:
>
> Hi,
>
> I have a seemingly easy question that has been keeping be busy for quite a
> while. The problem is the following:
>
> 0.1 + 0.1 + 0.1 == 0.3
> [1] FALSE
>
> Why is this false? Another example is
>
> 0.2 + 0.1 == 0.3
> [1] FALSE
>
> or
>
> 0.25 + 0.05 == 0.20 + 0.10
> [1] FALSE
>
> However, I do get TRUE if I use integers, or for example the following
>
> 0.1 + 0.1 == 0.2
> [1] TRUE
>
> It is probably something very basic, but I did not manage to find the
> answer.
>
> Thanks,
> Michael