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

From: Göran Broström <gb_at_stat.umu.se>
Date: Wed, 06 Apr 2011 00:23:01 +0200

5 apr 2011 kl. 21.01 skrev Gabor Grothendieck:

> 2011/4/5 Göran Broström <gb_at_stat.umu.se>:

>>
>> 5 apr 2011 kl. 18.25 skrev Gabor Grothendieck:
>>
>>> 2011/4/5 Göran Broström <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
>>> 

>> 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.
>>
> 
> Implement your datasets as .R files.  See ?data and the source to the
> quantreg package, say, as it uses .R files for its data.

Gabor, thanks again, I got it! Note though that quantreg nowadays uses .rda files for its data. But in an old version I found the way to do it.

Göran

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

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