On Tue, 19 Dec 2000, Alexander A. Morgan wrote:
> Hello:
> Is there any documentation dealing with the functional differences
> between R 1.1 and R 1.2. I have noticed some strange behavior in what is,
> I guess, the namespace of libraries as well as some changes in reading in
> tables.
>
> In a library, I don't seem to be able to declare a global variable
> and then use it in that same library.
>
> e.g.
> > blah <<- 0
> > print(blah)
>
> will fail in a library. It will fail with the following message:
I don't think you need to use <<- in this context. Why not just
blah<-0? This will create a variable in the environment of the package,
which is accessible from the rest of R. Alternatively, if you really want
a variable in the global environment, do
assign("blah",0,envir=.GlobalEnv)
rather than hoping <<- will put it where you want it. <<- is most
useful
for updating a variable that you know already exists.
The semantics of <<- have changed, but not that recently I think.
-thomas
Thomas Lumley Asst. Professor, Biostatistics
tlumley at u.washington.edu University of Washington, Seattle
>
> Error in print(blah) : Object "blah" not found
>
> It works fine on the command line, and the declaration of a global
> variable by itself in a library seems to work.
>
> i.e.
> > blah <<- 0
>
> will allow you to use blah.
>
> Also, it seems that R now converts the labels on columns to a form that
> works as an R object (or at least removes hyphen). For example, if I read
> in a table that has column headers such as "First-Data" it will
convert
> this to "First.Data". Is this intentional?
>
>
>
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>
Thomas Lumley Asst. Professor, Biostatistics
tlumley at u.washington.edu University of Washington, Seattle
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