[R-SIG-Mac] Starting tcltk without Tk

[Prof Brian Ripley]

On Mon, 5 May 2008, Simon Urbanek wrote:

> Philippe,
>
> I'm not quite sure why you are asking on a Mac list, but the error comes from 
> Tcl/Tk. I'd suggest asking on R-devel, the Tcl/Tk used in the R binary is the 
> same for R 2.6.x and 2.7.0 so it must be a change in tcltk.

That's my fault. Only a --with-aqua build of R tries to call Tk_Init if 
there is no DISPLAY set, so what he wants to do is MacOS-specific, AFAICS.

I had already told him (on R-devel) I think his 2.6.2 is a 
non-CRAN-binary.

Brian

>
> Cheers,
> Simon
>
>
> On May 4, 2008, at 7:01 AM, Philippe Grosjean wrote:
>
>> Hello,
>> 
>> Up to R 2.6.2, I used to start Tcl *without Tk* (I need only Tcl for some 
>> part of my work, like a socket server written in Tcl only, for instance) 
>> with this code under Mac OS X (particularly on this system, because I don't 
>> want to start X11 just to use Tcl code, which is required for Tk!):
>> 
>>> Sys.unsetenv("DISPLAY")
>>> library(tcltk)
>> 
>> I got then the message "no DISPLAY variable so Tk is not available", but 
>> could work with Tcl without problems.
>> 
>> Now, with R 2.7.0, I got the following and Tcl failed to load:
>> Loading Tcl/Tk interface ... Error in fun(...) : no display name and no 
>> $DISPLAY environment variable
>> Error : .onLoad failed in 'loadNamespace' for 'tcltk'
>> Error: package/namespace load failed for 'tcltk'
>> 
>> I try to locate the message "no display name and no $DISPLAY environment 
>> variable" in the code but I cannot find it. Could someone help me please?
>> 
>> I understand that starting Tcl without Tk from R is not an intended 
>> behaviour, but would it be possible to include an option to do so?
>> 
>>> sessionInfo()
>> R version 2.7.0 Patched (2008-04-22 r45460)
>> i386-apple-darwin8.10.1
>> 
>> locale:
>> 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
>> 
>> Many thanks,
>> 
>> Philippe Grosjean
>> -- 
>> ..............................................<°}))><........
>> ) ) ) ) )
>> ( ( ( ( (    Prof. Philippe Grosjean
>> ) ) ) ) )
>> ( ( ( ( (    Numerical Ecology of Aquatic Systems
>> ) ) ) ) )   Mons-Hainaut University, Belgium
>> ( ( ( ( (
>> ..............................................................
>> 
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>
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-- 
Brian D. Ripley,                  ripley at 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