Simon Urbanek wrote:
It turns out that the behavior of starting just Tcl was actually a bug.
Not completely. At least, loading of tcltk was correct when the "bug"
was there, but I totally agree that the mechanism used (according to the
presence or not of the DISPLAY variable is not the best one). It is not
true that there was no intention to allow loading tcltk without Tk.
Otherwise, why would you have this (tcltk.c, tcltk_init(), line 643 in
the R 2.7.0 source):
warning(_("no DISPLAY variable so Tk is not available"));
This message strongly suggests that starting tcltk without Tk is
allowed, and it also suggests the mechanism: by eliminating the DISPLAY
environment variable before starting tcltk. It is certainly
undocumented, most probably underused, and certainly requires a better
way to specify that the user does want to load Tk,... but at least, it
worked for me up to now.
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.
I vote for the second option.
Many thanks,
Philippe
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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