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

From: Gabor Grothendieck <ggrothendieck_at_gmail.com>
Date: Tue, 05 Apr 2011 15:01:26 -0400

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.

-- 
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email: ggrothendieck at gmail.com

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