Dear Jeff,
Thanks a lot...
Thanking you,
Yours sincerely,
Akshay m kulkarni
________________________________
From: Jeff Newmiller <jdnew...@dcn.davis.ca.us>
Sent: Monday, March 20, 2023 1:47 AM
To: akshay kulkarni <akshay...@hotmail.com>; r-help@r-project.org
<r-help@r-project.org>; Duncan Murdoch <murdoch.dun...@gmail.com>
Subject: Re: [R] lexical scoping for scripts......
Again, the answer is "interactivity does not matter".
On March 19, 2023 12:54:28 PM PDT, akshay kulkarni <akshay...@hotmail.com>
wrote:
>Dear Jeff,
> I will not be running R command in the shell prompt. So there
> is no banner, no > prompt. Just running "myscript.R" from the shell prompt.
> or from crontab in Linux. I think you get the context.....
>
>thanking you,
>yours sincerely
>AKSHAY M KULKARNI
>
>________________________________
>From: Jeff Newmiller <jdnew...@dcn.davis.ca.us>
>Sent: Monday, March 20, 2023 1:01 AM
>To: r-help@r-project.org <r-help@r-project.org>; akshay kulkarni
><akshay...@hotmail.com>; Duncan Murdoch <murdoch.dun...@gmail.com>; R help
>Mailing list <r-help@r-project.org>
>Subject: Re: [R] lexical scoping for scripts......
>
>What do _you_ mean when you use the term "interactive"? Because R
>distinguishes between executing code in a function and executing code from the
>global environment, but it does not care whether a person is doing the typing
>or not.
>
>I get the feeling that you think of your R code in terms of "scripts" when you
>should be thinking of your code in terms of functions. What parameters do you
>give to them, and what values do they return. Where you put those return
>values is up to you... how do you save them now? (Depending on auto-saving to
>.Rdata files is not a good idea in any case, but if you choose to use save()
>to specific filename.Rdata files works the same whether you type it
>interactively or use R CMD BATCH.
>
>On March 19, 2023 11:55:37 AM PDT, akshay kulkarni <akshay...@hotmail.com>
>wrote:
>>Dear Duncun,
>> What if there is no interactive "session" running? I
>> will be running my scripts automatically from crontab in Linux.
>>
>>THanking you,
>>Yours sincerely,
>>AKSHAY M KULKARNI
>>
>>________________________________
>>From: Duncan Murdoch <murdoch.dun...@gmail.com>
>>Sent: Monday, March 20, 2023 12:20 AM
>>To: akshay kulkarni <akshay...@hotmail.com>; R help Mailing list
>><r-help@r-project.org>
>>Subject: Re: [R] lexical scoping for scripts......
>>
>>On 19/03/2023 2:33 p.m., akshay kulkarni wrote:
>>> Dear Duncun,
>>> thanks for the reply....
>>>
>>> So when I run a script in the system command line by R CMD BATCH, the
>>> objects created in the script cannot be stored in the workspace ,right?
>>> If yes, how to save them? Moreover, the only way to save the objects
>>> CREATED from the script permanently is to save them to the disk, right?
>>
>>The objects you create *will* appear in the workspace of the session
>>that's running. They won't be saved to disk automatically so they'll
>>disappear at the end of the BATCH run. You can use various functions
>>(save(), save.image(), saveRDS(), writeLines(), etc.) to write them to
>>disk if you don't want them to disappear.
>>
>>Duncan Murdoch
>>
>>
>>>
>>> THanking you,
>>> yours sincerely,
>>> AKSHAY M KULKARNI
>>> ------------------------------------------------------------------------
>>> *From:* Duncan Murdoch <murdoch.dun...@gmail.com>
>>> *Sent:* Saturday, March 18, 2023 11:49 PM
>>> *To:* akshay kulkarni <akshay...@hotmail.com>; R help Mailing list
>>> <r-help@r-project.org>
>>> *Subject:* Re: [R] lexical scoping for scripts......
>>> On 18/03/2023 1:57 p.m., akshay kulkarni wrote:
>>>> Dear members,
>>>> The documentation for source() says:
>>>>
>>>> Input is read and parsed from that file until the end of the file is
>>>> reached, then the parsed expressions are evaluated sequentially in the
>>>> chosen environment.
>>>>
>>>> What does this mean? I presume that any objects that are CREATED by the
>>>> script are stored in the Global environment (if local = FALSE), but the
>>>> rules for lexical scoping are the same as for functions, right?
>>>
>>> No, assignments will happen in the "chosen environment" as well.
>>>
>>> I'm not sure exactly what you mean about the rules for lexical scoping,
>>> but I think the answer is yes. So if you do the following:
>>>
>>> Put this code in a file named "f.R":
>>>
>>> x <- 123
>>> f <- function() x
>>>
>>> and you run this code in your global environment:
>>>
>>> x <- 456
>>> e <- new.env()
>>> source("f.R", local = e)
>>>
>>> Then you'll find that x retains the value 456, and e$f() returns 123.
>>>
>>>>
>>>> Does the same apply for running the same script from the system command
>>>> line by R CMD BATCH?
>>>
>>> I don't think R CMD BATCH has any equivalent to the local argument.
>>> Everything is evaluated in the global environment.
>>>
>>> Duncan Murdoch
>>
>>
>> [[alternative HTML version deleted]]
>>
>>______________________________________________
>>R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see
>>https://stat.ethz.ch/mailman/listinfo/r-help
>>PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
>>and provide commented, minimal, self-contained, reproducible code.
>
>--
>Sent from my phone. Please excuse my brevity.
--
Sent from my phone. Please excuse my brevity.
[[alternative HTML version deleted]]
______________________________________________
R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see
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PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
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