[R] on lexical scoping....

[Deepayan Sarkar]

On Tue, Apr 4, 2023 at 7:26 PM akshay kulkarni <akshay_e4 using hotmail.com>
wrote:

> Dear Members,
>                              I have the following code typed at the
> console prompt:
>
> y   <-   x*10
>
> X has not been defined and the above code throws an object not found
> error. That is, the global environment does not contain x.


That is not the correct interpretation of the error. R will happily evaluate

y   <-   pi*10

even if the global environment does not contain pi. The "environments"
where R will look is given by

search()

If you manage to find a package that defines 'x' (and exports it),
attaching it will put the package on the search path, and then your call
will indeed no longer give an error.

-Deepayan

Why doesn't it look further in the environment stack, like that of
> packages? There are thousands of packages that contain the variable named
> x. Of course, that happens if the above code is in a function (or does it?).
>
> What concept of R is at work in this dichotomy?
>
> THanking you,
> Yours sincerely,
> AKSHAY M KULKARNI
>
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>
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