[R] Trouble with data dim

[Prof Brian Ripley]

> Date: Wed, 8 Mar 2000 09:02:13 -0800
> From: Clayton Springer <csprin at brandybuck.ca.sandia.gov>
> To: r-help at stat.math.ethz.ch
> Subject: [R] Trouble with data dim
> 
> Dear R users,
> 
> I am a novice user working through V & R. My first question stems
> from p20 of the second edition.:
> 
> I perform the following actions:
> 
> > mydata <- c(2.9,3.4,3.4,3.7,3.7,2.8,2.8,2.5,2.4,2.4)
> > names(mydata) <- c('c','j','b','e','i','h','g','d','f','a')
> > mydata
>   c   j   b   e   i   h   g   d   f   a 
> 2.9 3.4 3.4 3.7 3.7 2.8 2.8 2.5 2.4 2.4 
> 
> This is good and as V & R says it should be. Then I ...
> 
> > dim (mydata) <- c(2,5)
> > mydata
>      [,1] [,2] [,3] [,4] [,5]
> [1,]  2.9  3.4  3.7  2.8  2.4
> [2,]  3.4  3.7  2.8  2.5  2.4
> >
> The book says I should get the additional lines:
> 
> attr(,"names")
> [1] "c" "j" "b" "e" "i" "h" "g" "d" "f" "a"
> 
> What haven't I done?

Used an up-to-date edition!  V&R2 describes S-PLUS 3.x: see its preface.
V&R3 attempts to cover later versions of S-PLUS, and as far as possible R
(although R has changed a lot since Jan 1999 when that went to the
publishers).

Incidentally, S-PLUS 5.x acts differently here too.

-- 
Brian D. Ripley,                  ripley at 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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