[Rd] problem by calculation (PR#1435)

[ripley@stats.ox.ac.uk]

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
>
>
> -.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-
> r-devel mailing list -- Read http://www.ci.tuwien.ac.at/~hornik/R/R-FAQ.html
> Send "info", "help", or "[un]subscribe"
> (in the "body", not the subject !)  To: r-devel-request@stat.math.ethz.ch
> _._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._
>

-- 
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


-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-
r-devel mailing list -- Read http://www.ci.tuwien.ac.at/~hornik/R/R-FAQ.html
Send "info", "help", or "[un]subscribe"
(in the "body", not the subject !)  To: r-devel-request@stat.math.ethz.ch
_._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._