[Rd] logical operator and addition (PR#10665)

[ripley at stats.ox.ac.uk]

This seems another instance of FAQ Q7.31

> 0.6 - (0.4 + 0.2)
[1] -1.110223e-16


On Wed, 30 Jan 2008, nicolas_simonis at dfci.harvard.edu wrote:

> Full_Name: Nicolas Simonis
> Version: 2.6.1
> OS: windows
> Submission from: (NULL) (155.52.10.223)
>
>
> Very funny bug :

(rather a very common FAQ, when asked as a question)

>> 0.6<0.6
> [1] FALSE
>> 0.6<0.4+0.2
> [1] TRUE
>
> control :
>
>> 0.7<0.7
> [1] FALSE
>> 0.7<0.4+0.3
> [1] FALSE
>
> With R 2.6.1 windows. it's not doing it with R 2.3.1 linux...

It depends on the compiler and optimization settings: it is doing it on 
2.3.1 Linux for me (and 2.6.2 RC).

>
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-- 
Brian D. Ripley,                  ripley at stats.ox.ac.uk
Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
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