Re: [R] console from tcltk from Gabor Grothendieck on 2008-05-15 (R help archive)

From: Gabor Grothendieck <ggrothendieck_at_gmail.com>
Date: Wed, 14 May 2008 11:35:38 -0400

Thanks. I've updated to the latest R on the mirror I used and puts stdout 12
from tcl does indeed produce output from Rterm on Windows but gives an error message from Rgui on Windows (both on Windows Vista SP1).

this works

C:\tmp2>Rterm

R version 2.7.0 Patched (2008-05-11 r45672) [...deleted...]
> library(tcltk)

Loading Tcl/Tk interface ... done
> .Tcl("puts stdout 12")
12
<Tcl>
> xx <- .Tcl("puts stdout 12")
12

this gives an error message

C:\tmp2>Rgui

R version 2.7.0 Patched (2008-05-11 r45672) [...deleted...]
> library(tcltk)

Loading Tcl/Tk interface ... done
> xx <- .Tcl("puts stdout 12")
Error in structure(.External("dotTcl", ..., PACKAGE = "tcltk"), class = "tclObj") :
[tcl] can not find channel named "stdout".

On Wed, May 14, 2008 at 11:09 AM, Prof Brian Ripley <ripley_at_stats.ox.ac.uk> wrote:
> I assume by 'console' you mean the Rgui window. That is not where stdout is
> connected -- it is not a file. As the CHANGES file for 2.7.0 says

>


>    o   When Rgui is launched from a terminal, C output from ill-formed


>        packages that write to stdout or stderr rather than use

>        Rprintf will appear in the terminal rather than being lost.

>        (Only on XP or later.)  This can be very handy for debugging C

>        code in packages: just write debugging messages to stdout.

>

> And indeed that is what your example does. It also writes to the terminal
> from Rterm.

> Tcl is no different from any other C-based add-on in this respect.

> Note though that system() does provide a way to capture stdout to the Rgui
> window, so you can probably run tcl scripts via the tcl shell and capture
> their output.

> On Tue, 13 May 2008, Gabor Grothendieck wrote:

>
>> Is it possible to use the console from within tcltk?
>>
>>> library(tcltk)
>>> tcl("puts", "stdout", "Hello, World")
>>
>> Error in structure(.External("dotTclObjv", objv, PACKAGE = "tcltk"),
>> class = "tclObj") :
>>  [tcl] can not find channel named "stdout".
>>>
>>> .Tcl('puts stdout "Hello, World"')
>>
>> Error in structure(.External("dotTcl", ..., PACKAGE = "tcltk"), class
>> = "tclObj") :
>>  [tcl] can not find channel named "stdout".
>>>
>>> R.version.string  # Windows Vista
>>
>> [1] "R version 2.7.0 RC (2008-04-17 r45367)"
>

> Oh dear, not even the released version! Please update as the posting guide
> asked you to do before posting.

>
>> ______________________________________________
>> 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.
>>
>


> --

> Brian D. Ripley,                  ripley@stats.ox.ac.uk


> Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/

> University of Oxford,             Tel:  +44 1865 272861 (self)

> 1 South Parks Road,                     +44 1865 272866 (PA)

> Oxford OX1 3TG, UK                Fax:  +44 1865 272595

>

______________________________________________
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.

Received on Wed 14 May 2008 - 19:11:21 GMT