From ripley@stats.ox.ac.uk  Fri Apr  5 10:03:03 2002
From: ripley@stats.ox.ac.uk (ripley@stats.ox.ac.uk)
Date: Fri, 5 Apr 2002 11:03:03 +0200 (MET DST)
Subject: [Rd] problem by calculation (PR#1435)
Message-ID: <200204050903.LAA05622@pubhealth.ku.dk>

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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[Rd] problem by calculation (PR#1435)
ripley@stats.ox.ac.uk