[R] Problem with global variable building a package

[Greg Snow]

Probably the best thing to do is create an environment within the
package that you can assign to and read from.

Somewhere in the source code for the package include a line like:

my.env <- new.env()

then within any functions defined after that line you can set
variables within the environment with code like:

  my.env$paramA <- 3

and other functions can then read my.env$paramA.  This way you don't
need to worry about assign or <<- and all your functions will have
access to the same set of variables (but they won't interfere with the
users workspace).

On Tue, Aug 7, 2012 at 1:09 AM, Eva Prieto Castro <evapcastro at yahoo.es> wrote:
>
>
> Hi,
>
>
>
> My name is
> Eva and this is my first message here. My English is not very good, but I hope
> you can understand my question, in the context of an academic project.
>
>
>
> I have
> developed several functions in R and the
> idea is that the user can access functions in order to:
>
>
>
> 1)
> Alter
> parameters in relation with data and type of analysis.
>
> 2)
> Run
> statistical analysis (Text and pdf files with results will be generated).
>
> 3)
> View
> the value of the most important parameters.
>
>
>
> All the
> parameters I need are stored in a list object, and this list is used in all the
> functions along the cycle performed by the user, but I would like the user does
> not need to pass the name of the list as argument when he/she runs the different
> functions, so I think I need to treat the list as a global variable.
>
>
>
> Firstly, I
> used the global assignment operator (“<<-“); secondly, I used “get” and “assign”
> functions and even I used a new.env() in order to use a new environment
> exclusively for my list. However, when I try to build a package with all my
> functions I don’t reach this end, because of an error in parse process.
>
>
>
> My question
> for you is the following: taking into account that my end is to build a
> package, what can I do with this “global” list?. How can I treat it?.
>
>
>
> Thanks in
> advance.
>
>
>
> Regards,
>
> Eva
>
>
>
>
>         [[alternative HTML version deleted]]
>
>
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>



-- 
Gregory (Greg) L. Snow Ph.D.
538280 at gmail.com