Re: [Rd] Names of a data set in a package

From: Göran Broström <gb_at_stat.umu.se>
Date: Tue, 05 Apr 2011 20:50:00 +0200

5 apr 2011 kl. 18.25 skrev Gabor Grothendieck:

> 2011/4/5 Göran Broström <gb@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
>
Thanks Gabor, but where do I put this in my package? To clarify, I want

> data(B, package = "A")

and

> data(C, package = "A")

refer to the same data set.

Göran
>
> --
> Statistics & Software Consulting
> GKX Group, GKX Associates Inc.
> tel: 1-877-GKX-GROUP
> email: ggrothendieck at gmail.com



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