R devel - Apr 2011 - Names of a data set in a package

For some reason I want to let one data set in a package be known under 
two different names.  Is that possible, and if so, how? I do not want to 
have two copies of the data set in the package.

Thanks,

G?ran
-- 
G?ran Brostr?m
Department of Statistics
Ume? University
SE-90187 Ume?, Sweden

2011/4/5 G?ran Brostr?m <gb at stat.umu.se>:
> For some reason I want to let one data set in a package be known under two
> different names. ?Is that possible, and if so, how? I do not want to have
> two copies of the data set in the package.
>
This will allow you to read the data frame under a different name but
you won't be able to modify it under the different name.  We make use
of the built in data frame BOD and create the alternate name BOD2:
> makeActiveBinding("BOD2", function() BOD, .GlobalEnv)
> BOD$Time
[1] 1 2 3 4 5 7
> BOD2$Time
[1] 1 2 3 4 5 7
> # changing BOD also changes BOD2
> BOD$Time[1] <- 99
> BOD2$Time
[1] 99  2  3  4  5  7


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