It's called `rounding error'. Please look it up in an introductory
numerical analysis textbook.
Please also read the section on `what is a bug' in the R FAQ, and if you
do report a genuine bug please try to use an informative subject line.
On Fri, 5 Apr 2002 feng@tu-cottbus.de wrote:
> Full_Name: Jinsheng Feng
> Version: R141
> OS: Linux and Windows2000
> Submission from: (NULL) (141.43.226.235)
>
>
> I have installed R141 under Xteamlinux4.0 (Chinese) and MS Windows2000. By
run
> following I have two resalts:
> A <- matrix(c(1, 2, 7, 3), ncol=2, byrow=T)
> Ai <- solve(A)
> b <- c(2, 3)
> x <- Ai%*%b
>
> resalt under Windows
> >x
> [,1]
> [1,] -2.220446e-16
> [2,] 1.000000e-00
>
> resalt under Linux
> >x
> [,1]
> [1,] 1.110223e-16
> [2,] 1.000000e-00
>
>
>
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--
Brian D. Ripley, ripley@stats.ox.ac.uk
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 272860 (secr)
Oxford OX1 3TG, UK Fax: +44 1865 272595
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