From Achim.Zeileis at wu-wien.ac.at  Mon Aug  3 09:45:09 2009
From: Achim.Zeileis at wu-wien.ac.at (Achim Zeileis)
Date: Mon, 3 Aug 2009 09:45:09 +0200 (CEST)
Subject: [Rd] incorrect result (41/10-1/10)%%1 (PR#13863)
In-Reply-To: <20090801200513.EC2A8282EF3D@mail.pubhealth.ku.dk>
References: <20090801200513.EC2A8282EF3D@mail.pubhealth.ku.dk>
Message-ID: <Pine.LNX.4.64.0908030944140.19820@paninaro.stat-math.wu-wien.ac.at>

Not a bug, just a FAQ (7.31).
http://CRAN.R-project.org/doc/FAQ/R-FAQ.html#Why-doesn_0027t-R-think-these-numbers-are-equal_003f

On Sat, 1 Aug 2009, jan.hattendorf at unibas.ch wrote:

> Full_Name: jan hattendorf
> Version: 2.9.0
> OS: XP
> Submission from: (NULL) (213.3.108.185)
>
>
> I get an incorrect result for
>
> (41/10-1/10)%%1
>
> [1] 1
>
> The error did not occur with other numbers than 41 (1, 11, 21, 31, 51, ...)
>
>
> test <- rep(NA, 1000)
> for(i in 1:1000){
>  test[i] <- i/10-1/10
> }
> test[test%%1==0]
>
> ______________________________________________
> R-devel at r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-devel
>
>



[Rd] incorrect result (41/10-1/10)%%1 (PR#13863)
Achim Zeileis