[R-pkg-devel] RData files with identical objects in package

[Troels Ring]

Thanks a lot - I'm sure you are right that I could just use different names but I cannot understand why it could cause problem to have two different well formated .RData files in the /data directory both with an "x" - is that really illegal? I cannot see it stated in the official munual - but it is long (wrting r extensions)
-BW
Troels

-----Oprindelig meddelelse-----
Fra: Michael Dewey <lists using dewey.myzen.co.uk> 
Sendt: 13. januar 2019 12:56
Til: Troels Ring <tring using gvdnet.dk>; package-develop <r-package-devel using r-project.org>
Emne: Re: [R-pkg-devel] RData files with identical objects in package

Dear Troels

Perhaps I misunderstand what you are trying to do but would it be possible to put each x and y into a list or a dataframe with different names and then modify your usgae to pull them from there? Then there would be no danger of users getting the wrong x and y

Michael

On 13/01/2019 08:38, Troels Ring wrote:
> Dear friends - I have a package under creation making heavy 
> calculations on chemical/clinical data and I plan to include as 
> "examples" the use of some literature data used in my papers. To 
> illustrate what then occurs, I made two RData files consisting only of 
> x and y with different values for x and y like
> 
> X <- 100
> 
> Y <- 1000
> 
> save(x,y,file="first.RData")
> 
> and then a new x and y in "second" with x <- 45 and y <- 32
> 
> When I put these in a "data" directory of a new package without 
> further ado in RStudio
> 
> Ctrl-shift-L
> 
> Ctrl-shift-B
> 
>   
> 
> .there is a warning
> 
> * installing *source* package 'try' ...
> 
> ** R
> 
> ** data
> 
> *** moving datasets to lazyload DB
> 
> warning: objects 'x', 'y' are created by more than one data call
> 
> ** byte-compile and prepare package for lazy loading
> 
> ** help
> 
>    converting help for package 'try'
> 
> *** installing help indices
> 
>      finding HTML links ...    hello                                   html
> 
>   done
> 
>   
> 
> Now, when I clear the workspace:
> 
>> ls()
> character(0)
>> devtools::load_all(".")
> Loading try
>   
> Restarting R session...
>   
>> library(try)
>> ls()
> character(0)
>> x   #-- so even if workspace Is empty x is still kept
> [1] 45
>> data(first) # and "first" is not seen x
> [1] 45
> 
>   
> 
> x is still present - and y
> 
>   
> 
> I have been reading and searching in "Writing R extensions" but so far
> didn't find the clue.
> 
> Seemingly it is the file with the last name that is assessed - when I rename
> first.RData to "xfile.RData" we get 100 and 1000.
> 
> Now and then when running ctrl-shift-L and - B we see
> 
>   
> 
> Attaches package: 'try'
>   
> The following objects are masked _by_ '.GlobalEnv':
> x, y
> 
>   
> 
> Sorry for these problems -
> 
> BW
> Troels
> 
> 
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> 
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-- 
Michael
http://www.dewey.myzen.co.uk/home.html