Dear richard,
Bulls eye! thanks for your pointed reply...!
THanking you,
Yours sincerely,
AKSHAY M KULKARNI
From: Richard O'Keefe
Sent: Wednesday, April 5, 2023 10:30 AM
To: akshay kulkarni
Cc: R help Mailing list
Subject: Re: [R
: Re: [R] on lexical scoping
The following *might* be of use to you. If you can predict what the various
function invocations will do, I think you have a reasonable grasp of how
lexical scoping works in R (contrary or supplementary opinions welcome). It is
the sort of thing you will find
Hi Duncan. I read it a long time ago so it's probably best if
I read it again ALONG with your corrections. Every detail matters
with these concepts so thanks a lot.
Mark
On Wed, Apr 5, 2023 at 5:12 AM Duncan Murdoch
wrote:
> It seems mostly correct. Here are a few quibbles:
>
> - I don't
It seems mostly correct. Here are a few quibbles:
- I don't think "owner" is a good description of the parent environment.
Usually when I use owner in computing, there's an implication that the
owner controls what it owns, is responsible for allocating and
destroying it, etc. Parent
R *does* search the environment stack.
> search()
[1] ".GlobalEnv""package:stats" "package:graphics"
[4] "package:grDevices" "package:utils" "package:datasets"
[7] "package:methods" "Autoloads" "package:base
What you seem to be missing is that a package may contain
Leading off with you can only have two things in an environment definitely
indicates this should be read with a skeptical eye.
Although the title of "Advanced R" may be more scary than someone writing notes
on GitHub like a bro, IMHO Adv R is quite readable for anyone interested in
questions
obviously, everyone has different opinions on what's useful but I always
found this document quite
helpful. I think, in the past, someone said that there are some incorrect
statements in but I'm not sure
what they are.
The following *might* be of use to you. If you can predict what the various
function invocations will do, I think you have a reasonable grasp of how
lexical scoping works in R (contrary or supplementary opinions welcome).
It is the sort of thing you will find in the references also. If this is
all
Dear Duncan,
THanks a lot..!!
THanking you,
Yours sincerely,
AKSHAY M KULKARNI
From: Duncan Murdoch
Sent: Tuesday, April 4, 2023 8:49 PM
To: akshay kulkarni ; Deepayan Sarkar
Cc: R help Mailing list
Subject: Re: [R] on lexical scoping
-
*From:* Duncan Murdoch
*Sent:* Tuesday, April 4, 2023 8:21 PM
*To:* akshay kulkarni ; Deepayan Sarkar
*Cc:* R help Mailing list
*Subject:* Re: [R] on lexical scoping
You can't change the basic way R searches, but you can ask for a
different kind of search. For example, to see if &qu
To: akshay kulkarni ; Deepayan Sarkar
Cc: R help Mailing list
Subject: Re: [R] on lexical scoping
You can't change the basic way R searches, but you can ask for a
different kind of search. For example, to see if "x" exists, you can use
exists("x")
and it will d
g when x is not defined in the
global environment but takes on a value from one of the loaded packages? any
packages for that?
THanking you,
Yours sincerely,
AKSHAY M KULKARNI
From: Deepayan Sarkar
Sent: Tuesday, April 4, 2023 7:51 PM
To: akshay kulkarni
.1.10 in that manual for how R looks up variables.
Duncan Murdoch
THanking you,
Yours sincerely,
AKSHAY M KULKARNI
*From:* Duncan Murdoch
*Sent:* Tuesday, April 4, 2023 7:48 PM
*To:* akshay kulkarni ; R help Mailing list
Dear Ducan,
Very informative! THanks a lot!
THanking you,
Yours sincerely,
AKSHAY M KULKARNI
From: Duncan Murdoch
Sent: Tuesday, April 4, 2023 8:14 PM
To: akshay kulkarni ; R help Mailing list
Subject: Re: [R] on lexical scoping
Dear Jeff,
THanks a lot for the pithy reply...
Thanking you,
Yours sincerely,
AKSHAY M KULKARNI
From: Jeff Newmiller
Sent: Tuesday, April 4, 2023 7:43 PM
To: r-help@r-project.org ; akshay kulkarni
; R help Mailing list
Subject: Re: [R
Dear Bert,
THanks a lot. I will take a look at those...
THanking you,
Yours sincerely,
AKSHAY M KULKARNI
From: Bert Gunter
Sent: Tuesday, April 4, 2023 7:48 PM
To: akshay kulkarni
Cc: R help Mailing list
Subject: Re: [R] on lexical scoping
lkarni ; R help Mailing list
Subject: Re: [R] on lexical scoping
On 04/04/2023 9:56 a.m., akshay kulkarni wrote:
> Dear Members,
> I have the following code typed at the console
> prompt:
>
> y <- x*10
>
> X has not been defined a
KULKARNI
From: Deepayan Sarkar
Sent: Tuesday, April 4, 2023 7:51 PM
To: akshay kulkarni
Cc: R help Mailing list
Subject: Re: [R] on lexical scoping
On Tue, Apr 4, 2023 at 7:26 PM akshay kulkarni
mailto:akshay...@hotmail.com>> wrote:
Dear M
On Tue, Apr 4, 2023 at 7:26 PM akshay kulkarni
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
On 04/04/2023 9:56 a.m., akshay kulkarni 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. Why
?search and ?environment
See also "The R Language Definition" manual for similar such questions.
-- Bert
On Tue, Apr 4, 2023 at 6:56 AM akshay kulkarni wrote:
>
> Dear Members,
> I have the following code typed at the console
> prompt:
>
> y <- x*10
>
> X has
Namespaces. Packages only export specific object names from their namespaces.
But few instances of x would be found there.
Also, function argument lists are not added to the search path until the
functions are running, and then the search path only goes through the
environments in which the
22 matches
Mail list logo
