R help - Mar 2013 - How to start console output with a comment sign (as in knitr)

Dear all,
knitr writes a comment sign in front of each line of console output.  This
extremely useful, especially for beginners who are starting to write scripts. 
One could just compose their script in the console (getting immediate output)
and then copy the whole chunk into their .r-file.
I have been able to configure the options such that the prompt and the
continuing line labels are replaced by blanks.  However, I do not know how to
automatically comment out each line of output.  Ideally, my console would behave
exactly like knitr.

At my work place I only have access to the R console that is included the
standard download for windows.  I cannot replace it by an editor that may have
additional features.

Would there be a way to achieve the knitr-look in the standard console?

Many thanks,  Marcus

?options

Change the "prompt" option:
options(prompt = "# ")   ## is I think what you want.

-- Bert

On Sat, Mar 2, 2013 at 5:35 AM, Marcus Kriele <mkriele at me.com>
wrote:
> Dear all,
> knitr writes a comment sign in front of each line of console output.  This
extremely useful, especially for beginners who are starting to write scripts. 
One could just compose their script in the console (getting immediate output)
and then copy the whole chunk into their .r-file.
> I have been able to configure the options such that the prompt and the
continuing line labels are replaced by blanks.  However, I do not know how to
automatically comment out each line of output.  Ideally, my console would behave
exactly like knitr.
>
> At my work place I only have access to the R console that is included the
standard download for windows.  I cannot replace it by an editor that may have
additional features.
>
> Would there be a way to achieve the knitr-look in the standard console?
>
> Many thanks,  Marcus
> ______________________________________________
> 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.


-- 

Bert Gunter
Genentech Nonclinical Biostatistics

Internal Contact Info:
Phone: 467-7374
Website:
http://pharmadevelopment.roche.com/index/pdb/pdb-functional-groups/pdb-biostatistics/pdb-ncb-home.htm

Try the following to see if it does what you want:

## init
con <- textConnection("output", "w")
options(echo=FALSE)
sink(con)

addTaskCallback( function(expr, out, err, vis) {
sink()
close(con)
if(vis) {
cat(paste("#", output, collapse="\n"), "\n")
}
con <- textConnection("output", "w")
sink(con)
TRUE
})

3+4
5*6
tmp <- 7-8
ls()


### clean up when finished
removeTaskCallback(1)
sink()
options(echo=TRUE)


This misses errors and warnings, but should do what you want for everything
else.


On Sat, Mar 2, 2013 at 6:35 AM, Marcus Kriele <mkriele@me.com> wrote:
> Dear all,
> knitr writes a comment sign in front of each line of console output.  This
> extremely useful, especially for beginners who are starting to write
> scripts.  One could just compose their script in the console (getting
> immediate output) and then copy the whole chunk into their .r-file.
> I have been able to configure the options such that the prompt and the
> continuing line labels are replaced by blanks.  However, I do not know how
> to automatically comment out each line of output.  Ideally, my console
> would behave exactly like knitr.
>
> At my work place I only have access to the R console that is included the
> standard download for windows.  I cannot replace it by an editor that may
> have additional features.
>
> Would there be a way to achieve the knitr-look in the standard console?
>
> Many thanks,  Marcus
> ______________________________________________
> R-help@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.
>


-- 
Gregory (Greg) L. Snow Ph.D.
538280@gmail.com

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