On 13/01/2019 3:38 a.m., 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
Does that every happen when ls() returns character(0)? It seems likely
that you have copies of them in the global workspace, and the message is
correct.
In the earlier situation (ls() *does* return character(0), but x is
still found), you can find where it was found using
getAnywhere("x")
For example,
> x <- 2
> getAnywhere("x")
A single object matching ‘x’ was found
It was found in the following places
.GlobalEnv
with value
[1] 2
Duncan Murdoch
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