It turns out that the behavior of starting just Tcl was actually a
bug. Apparently the intention was to attempt to start Tk regardless of
the DISPLAY variable, because some TclTk implementation such as Aqua
Tcl/Tk don't require DISPLAY and thus would not be loaded. Due to a
bug (HAVE_AQUA was not included in Rconfig.h before R 2.7.0), though,
this was not the case. I'll leave it to tcltk users/maintainers to
decide the right way forward. Essentially I see two options:
1) status quo: tcltk always attempts to load Tk and fails on an error
2) allow some (possibly cross-platform) way of specifying that it is
ok to not load Tk - essentially make failure to load Tk non-fatal.
Right now there is no (semantically correct) way to inhibit the
loading of Tk (DISPLAY is a sort of abuse and not a solution).
Cheers,
Simon
(CC to R-devel where this started...)
On May 5, 2008, at 9:12 AM, 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.
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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