Hello, Is there a way to get the current line number in an R script? As a silly example, if I have the following script and a function called getLineNumber (suppose one exists!), then the result would be 3. 1 # This is start of script 2 3 print( getLineNumber() ) 4 5 # End of script Thanks for any ideas! [[alternative HTML version deleted]]
I believe the answer is: No. "Line number" is an ambiguous concept. Does it mean physical line on a display of a given width? a line of code demarcated by e.g. <CR> ; a step in the execution of script (that might display over several physical lines?) However, various IDE's have and display "line numbers," so you might try researching whichever one that you use. (Note: Correction/clarification requested if I am wrong on this). -- Bert Bert Gunter "The trouble with having an open mind is that people keep coming along and sticking things into it." -- Opus (aka Berkeley Breathed in his "Bloom County" comic strip ) On Thu, Apr 6, 2017 at 11:59 AM, Brad P <bpschn01 at gmail.com> wrote:> Hello, > > Is there a way to get the current line number in an R script? > > As a silly example, if I have the following script and a function called > getLineNumber (suppose one exists!), then the result would be 3. > > 1 # This is start of script > 2 > 3 print( getLineNumber() ) > 4 > 5 # End of script > > Thanks for any ideas! > > [[alternative HTML version deleted]] > > ______________________________________________ > R-help at 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.
Hi Brad, Some of the debugging functions may be of use. You can look at trace() or setBreakpoint(). But I believe Bert is correct in saying your concept of a "Line Number" and R's concept of a "Line Number" will differ. Finally, you can look at the function findLineNum(), which can be called external to your source code file (not embedded as in your example).>?debugHTH, Bill William J. Michels, Ph.D. On Thu, Apr 6, 2017 at 12:30 PM, Bert Gunter <bgunter.4567 at gmail.com> wrote:> I believe the answer is: No. "Line number" is an ambiguous concept. > Does it mean physical line on a display of a given width? a line of > code demarcated by e.g. <CR> ; a step in the execution of script (that > might display over several physical lines?) > > However, various IDE's have and display "line numbers," so you might > try researching whichever one that you use. > > (Note: Correction/clarification requested if I am wrong on this). > > -- Bert > > > Bert Gunter > > "The trouble with having an open mind is that people keep coming along > and sticking things into it." > -- Opus (aka Berkeley Breathed in his "Bloom County" comic strip ) > > > On Thu, Apr 6, 2017 at 11:59 AM, Brad P <bpschn01 at gmail.com> wrote: >> Hello, >> >> Is there a way to get the current line number in an R script? >> >> As a silly example, if I have the following script and a function called >> getLineNumber (suppose one exists!), then the result would be 3. >> >> 1 # This is start of script >> 2 >> 3 print( getLineNumber() ) >> 4 >> 5 # End of script >> >> Thanks for any ideas! >> >> [[alternative HTML version deleted]] >> >> ______________________________________________ >> R-help at 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. > > ______________________________________________ > R-help at 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.
Possible clarification/correction...(apologies in advance if I'm being
redundant)
If I put the following four lines in a script whose file name is
"junk.r":
log(3)
log(4)
log('a')
log(5)
then it generates an error message, as expected:
> source('junk.r')
Error in log("a") (from junk.r#3) : non-numeric argument to
mathematical function
Note that the error message references the line number (correctly).
So there must be something somewhere that keeps track of the script's line
numbers. Finding it, however, is more than I'm ready to tackle.
-Don
--
Don MacQueen
Lawrence Livermore National Laboratory
7000 East Ave., L-627
Livermore, CA 94550
925-423-1062
On 4/6/17, 12:30 PM, "R-help on behalf of Bert Gunter"
<r-help-bounces at r-project.org on behalf of bgunter.4567 at gmail.com>
wrote:
I believe the answer is: No. "Line number" is an ambiguous
concept.
Does it mean physical line on a display of a given width? a line of
code demarcated by e.g. <CR> ; a step in the execution of script (that
might display over several physical lines?)
However, various IDE's have and display "line numbers," so you
might
try researching whichever one that you use.
(Note: Correction/clarification requested if I am wrong on this).
-- Bert
Bert Gunter
"The trouble with having an open mind is that people keep coming along
and sticking things into it."
-- Opus (aka Berkeley Breathed in his "Bloom County" comic strip )
On Thu, Apr 6, 2017 at 11:59 AM, Brad P <bpschn01 at gmail.com> wrote:
> Hello,
>
> Is there a way to get the current line number in an R script?
>
> As a silly example, if I have the following script and a function
called
> getLineNumber (suppose one exists!), then the result would be 3.
>
> 1 # This is start of script
> 2
> 3 print( getLineNumber() )
> 4
> 5 # End of script
>
> Thanks for any ideas!
>
> [[alternative HTML version deleted]]
>
> ______________________________________________
> R-help at 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.
______________________________________________
R-help at 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.