On Wed, 11 May 2005 [EMAIL PROTECTED] wrote: > Yes, you are correct. I had only checked one of my platforms. Linux > works as you suggest. But for me on Windows, > >> x <- 1 >> y <- 0.2 >> x %/% y > [1] 5 ## I get a 4 in Linux
I get 5 on Windows, but > (x %% y) + y * (x %/% y) [1] 1 so is there a problem particular to your Windows runtime? > > version > _ =20 > platform i386-pc-mingw32 > arch i386 =20 > os mingw32 =20 > system i386, mingw32 =20 > status =20 > major 2 =20 > minor 1.0 =20 > year 2005 =20 > month 04 =20 > day 18 =20 > language R =20 > > > -----Original Message----- > From: Peter Dalgaard [mailto:[EMAIL PROTECTED] > Sent: Wednesday, May 11, 2005 4:14 PM > To: McGehee, Robert > Cc: [EMAIL PROTECTED]; Peter Dalgaard; [EMAIL PROTECTED]; > [EMAIL PROTECTED]; r-devel@stat.math.ethz.ch > Subject: Re: [Rd] bug in modulus operator %% (PR#7852) > > > "McGehee, Robert" <[EMAIL PROTECTED]> writes: > >> Yes, but from ?"%%": >> "It is guaranteed that 'x =3D=3D (x %% y) + y * (x %/% y)' (up to = > rounding >> error) ..." >> =20 >> (R 2.1.0) >>> x <- 1 >>> y <- 0.2 >>> x %% y >> [1] 0.2 >>> (x %% y) + y * (x %/% y) >> [1] 1.2 >> =20 >> Certainly 1 does not equal 1.2 as the documentation would suggest, and >> these seem like large enough numbers to not be effected by rounding >> errors or lack of precision. > > Now that looks a bit odd, but it isn't universal: > >> x <- 1 >> y <- 0.2 >> x %% y > [1] 0.2 >> x %/% y > [1] 4 >> (x %% y) + y * (x %/% y) > [1] 1 > > So what platform was that happening on? > > --=20 > O__ ---- Peter Dalgaard Blegdamsvej 3 =20 > c/ /'_ --- Dept. of Biostatistics 2200 Cph. N =20 > (*) \(*) -- University of Copenhagen Denmark Ph: (+45) 35327918 > ~~~~~~~~~~ - ([EMAIL PROTECTED]) FAX: (+45) 35327907 > > ______________________________________________ > R-devel@stat.math.ethz.ch mailing list > https://stat.ethz.ch/mailman/listinfo/r-devel > > -- Brian D. Ripley, [EMAIL PROTECTED] Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/ University of Oxford, Tel: +44 1865 272861 (self) 1 South Parks Road, +44 1865 272866 (PA) Oxford OX1 3TG, UK Fax: +44 1865 272595 ______________________________________________ R-devel@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-devel
