[R] RWin 1.2.1: Can't access sample datasets, e.g. MASS

Thomas Lumley tlumley at u.washington.edu
Tue Feb 6 01:43:31 CET 2001

On Mon, 5 Feb 2001, peter denisevich wrote:

> I'm pretty sure I'll feel like [more of] an idiot but...
> Using Rgui working in a fresh, blank directory.
>  > require(MASS)
> Loading required package: MASS
> [1] TRUE
>  > data(cabbages)
> Warning message:
> ======> Data set `cabbages' not found in: data(cabbages)  <=====
> Same result for any other dataset.

I get this for MASS only, not for other packages

> All packages were installed in RW1021/library/<pkg>, some by manual 
> download/rinst some by install.packages().
> Note that after installation, the library/MASS/data directory contained 
> ONLY RData.zip, so I unzipped it; the same for the other data (and R-ex) 
> directories in the tree.  Is this new behavior?

Yes, RData.zip is deliberate. It saves space (particularly with a FAT16
disk, where little files are very inefficient). In general, if the
installer puts it there you should leave it there.

However, there does seem to be a bug in the packaging of the current MASS
version. The data/filelist file, which is supposed to give the contents of
RData.zip actually has the contents of the data/ directory. 
As a workaround If you edit this file to list the contents of RData.zip
(or just the files you want to load), data() will work.	


Thomas Lumley			Asst. Professor, Biostatistics
tlumley at u.washington.edu	University of Washington, Seattle

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