R help - Apr 2010 - source(,echo=T) doesn't echo final comments

Hi,

source(file,echo=T) will not echo the last comment in "file" if it is
the last line in the file.
For instance, when sourcing a file containing the following lines

#comment 1
a<-1
#comment 2

R will echo
> #comment 1
> a<-1
What is the solution to have R echo all of the comment lines?

Specific context:
This problem arises e.g. in the context of help files (.Rd) whose example
section contains only code that is not to be run (\dontrun markup). Running the
function example() (that itself calls source(,echo=TRUE)) on such a file will
not display anything (because the code is commented out in the corersponding
files in R-ex). Is that the desired behavior of example() or is there a
workaround (i.e. to be able write help files with only dontrun code but that
will nevertheless echo the examples)?

Thank you,
Alexandre Kuhn


> sessionInfo()
R version 2.10.1 (2009-12-14) 
i386-apple-darwin9.8.0 

locale:
[1] en_US.UTF-8/en_US.UTF-8/C/C/en_US.UTF-8/en_US.UTF-8

attached base packages:
[1] stats     graphics  grDevices utils     datasets  methods   base

On 12/04/2010 7:14 PM, Kuhn, Alexandre (NIH/NIA/IRP) [V]
wrote:
> Hi,
>
> source(file,echo=T) will not echo the last comment in "file" if
it is the last line in the file.
> For instance, when sourcing a file containing the following lines
>
> #comment 1
> a<-1
> #comment 2
>
> R will echo
>
> > #comment 1
> > a<-1
>
> What is the solution to have R echo all of the comment lines?
>   
I think the only current solution is to have all the comment lines ahead 
of code lines.  R doesn't specifically echo the comments, it only echoes 
the code, but comments that happen to precede the end of the code line 
are echoed as part of that line.
> Specific context:
> This problem arises e.g. in the context of help files (.Rd) whose example
section contains only code that is not to be run (\dontrun markup). Running the
function example() (that itself calls source(,echo=TRUE)) on such a file will
not display anything (because the code is commented out in the corersponding
files in R-ex). Is that the desired behavior of example() or is there a
workaround (i.e. to be able write help files with only dontrun code but that
will nevertheless echo the examples)?
>
>   
I'm not sure we really want to show all the \dontrun examples, but I'll 
look into this, because as documented, they should be shown. (My 
preference would be to completely hide the \dontrun lines in example(), 
but that's not what is documented to happen, and that's not what happens
when they are followed by code.)

Duncan Murdoch
> Thank you,
> Alexandre Kuhn
>
>
>
> > sessionInfo()
> R version 2.10.1 (2009-12-14) 
> i386-apple-darwin9.8.0 
>
> locale:
> [1] en_US.UTF-8/en_US.UTF-8/C/C/en_US.UTF-8/en_US.UTF-8
>
> attached base packages:
> [1] stats     graphics  grDevices utils     datasets  methods   base 
> ______________________________________________
> R-help at r-project.org mailing list
> 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.
>

On 13/04/2010 8:50 AM, Duncan Murdoch wrote:
> On 12/04/2010 7:14 PM, Kuhn, Alexandre (NIH/NIA/IRP) [V] wrote:
>> Hi,
>>
>> source(file,echo=T) will not echo the last comment in "file"
if it is the
last line in the file.
>> For instance, when sourcing a file containing the following lines
>>
>> #comment 1
>> a<-1
>> #comment 2
>>
>> R will echo
>>
>>> #comment 1
>>> a<-1
>> What is the solution to have R echo all of the comment lines?
>>
> I think the only current solution is to have all the comment lines ahead
> of code lines.  R doesn't specifically echo the comments, it only
echoes
> the code, but comments that happen to precede the end of the code line
> are echoed as part of that line.
>> Specific context:
>> This problem arises e.g. in the context of help files (.Rd) whose
example
section contains only code that is not to be run (\dontrun markup). Running
the function example() (that itself calls source(,echo=TRUE)) on such a file
will not display anything (because the code is commented out in the
corersponding files in R-ex). Is that the desired behavior of example() or
is there a workaround (i.e. to be able write help files with only dontrun
code but that will nevertheless echo the examples)?
>>
>>
> I'm not sure we really want to show all the \dontrun examples, but
I'll
> look into this, because as documented, they should be shown. (My
> preference would be to completely hide the \dontrun lines in example(),
> but that's not what is documented to happen, and that's not what
happens
> when they are followed by code.)
I've fixed this now in R-devel (to become 2.12.0 in the fall).  It's too
late to make it into 2.11.0, but I may put it into R-patched after the
release.

Duncan Murdoch

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