[Rd] Sharing variables in seperate workspace

Philip philip at sctkjeld.dk
Tue Apr 21 23:47:50 CEST 2009

Hi Martin

Thank you very much. That solved my problem, and the package is now working!

Best regards. Philip.

Martin Morgan wrote:
> Philip <philip at sctkjeld.dk> writes:
>> Hi all.
> Hi Philip -- I think this thread
>   https://stat.ethz.ch/pipermail/r-devel/2009-March/052867.html
> addresses your issue. Basically, create an environment or closure in
> which you can modify variables.
> HTH,
> Martin
>> I'm for the first time trying to make a library in R 2.8.1 on Ubuntu
>> Linux. The library is very simple, R functions just need to share a
>> variable (that is defined in the R code) and maybe functions and export
>> functions for the user to .GlobalEnv. This variable should only be
>> directly accessible from the global workspace (without change of
>> environment) via a hereto dedicated function. It only consists of R
>> code. I'm not sure if I should rather ask R-help. If so, just tell me.
>> The package source is available at
>> http://www.delff.dk/~philip/bdplot/
>> the check output at
>> http://www.delff.dk/~philip/bdplot.Rcheck/
>> The package code was checked and stopped because of lack of examples.
>> Until that, everything is OK.
>>> ### ** Examples
>>> ~~ simple examples of the most important functions ~~
>> Error: unexpected symbol in "~~ simple examples"
>> Execution halted
>> I would like to get the code issue solved before moving the
>> documentation from the R scripts and have proceeded the to building and
>> installation. These two last steps gave no warnings or errors.
>> My problem is that I cannot change the mentioned variable (from now on
>> called .FOO) that belongs to the namespace of the package. I think it is
>> because .FOO variable in some locked state, maybe by default created as
>> read-only. It is called .FOO because I use exportPattern("^[[:alpha:]]+")
>> as NAMESPACE file. I don't import anything.
>> I have a function (bar) that, like par does with .Pars from the graphics
>> namespace, modifies the contents of a list. This function has in the
>> bottom (when the function name is called without () from the R command
>> line) a line
>> <environment: namespace:"mypackage">
>> This is like par() has the graphics namespace mentioned, and therefore,
>> as I would expect. I can via this function read the contents of the
>> variable just by print(.FOO). This cannot be done from .GlobalEnv which
>> is as intended. The surprise is that I cannot write to it. If I do
>> .FOO$x <<- "value"
>> (names and values are arguments to the function, like with par().), I
>> get the error:
>> cannot change value of locked binding for '.FOO'
>> The double arrow, I use because <- does not affect the contents of .FOO
>> after the function has run. I don't know how I can use assign in this
>> case. I don't know a name for my package's environment. I have tried
>> with my package's name in both assign() and unlockBinding(), but my
>> package's name is not recognized as an environment (neither beginning
>> with a dot.). I also tryed unlockBinding() in the NAMESPACE file.
>> I don't know if this is normal, but I get
>> <environment: R_GlobalEnv>
>> from print(parent.frame()) and things like
>> <environment: 0x8df2ad0>
>> from print(environment())
>> This is surprising to me. I would expect
>> <environment: bdplot>
>> from environment().
>> How can I get to write to .FOO via bar()?
>> Thank you very much
>> Philip.
>> ______________________________________________
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