[Rd] error in make.names docs (PR#6912)
Prof Brian Ripley
ripley at stats.ox.ac.uk
Mon May 24 18:04:23 CEST 2004
Example output in comment is now corrected in R-patched.
What has the rest to do with a bug report?
On Mon, 24 May 2004 mmiller3 at iupui.edu wrote:
> Full_Name: Mike Miller
> Version: 1.9.0
> OS: win2000
> Submission from: (NULL) (134.68.121.109)
>
>
> The docs for make.names imply that the result of
>
> make.names(c("a and b", "a_and_b"), unique=TRUE)
>
> should be
>
> "a.and.b" "a.and.b.1"
>
> when it is actually
>
> "a.and.b" "a_and_b"
>
> The docs do not reflect this very major change in behavior from 1.8.x to 1.9.0.
> This change causes numerous R codes to fail in senarios like the following.
> Suppose I have a data file, example.dat, like this:
>
> a b x some_factor
> 1 1 0.4 orange
> 2 1 0.3 blue
> 1 1 0.2 dog
> 2 1 0.1 orange
> 1 2 0.4 blue
> 2 2 0.3 dog
> 1 2 0.2 orange
> 2 2 0.1 blue
>
> To read and use this in a version independent way, I've tried to write
> version-aware code, but this is difficult as '_' is not syntactically valid
> prior to R 1.9.0. If it were, the following code might work. Of course, if '_'
> were allowed, this issue would not be be a problem.
>
> df <- read.table('example.dat',header=T)
> if ( version['minor'] == "9.0" ) {
> plot(x ~ some_factor, data=df)
> } else {
> plot(x ~ some.factor, data=df)
> }
>
> ______________________________________________
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> https://www.stat.math.ethz.ch/mailman/listinfo/r-devel
>
>
--
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 272866 (PA)
Oxford OX1 3TG, UK Fax: +44 1865 272595
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