[R] Subtle changes from 1.1 to 1.2

Alexander A. Morgan amorgan at linus.mitre.org
Tue Dec 19 14:06:18 CET 2000

	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

	In a library, I don't seem to be able to declare a global variable
and then use it in that same library.  

> blah <<- 0
> print(blah)

will fail in a library.  It will fail with the following message:

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.

> 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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