First, this does depend on what build of R you use. The 'HAVE_AQUA'
define matters, and is only defined on some Mac OS X builds (e.g. not the
default one, but the one used for the CRAN binary).
Second, there are several possible versions of Tcl/Tk and X11 on MacOS X,
and as I suspect one of your R versions was not a CRAN build, I am not
willing to make assumptions here. (E.g. I do run a self-compiled
command-line version of R using ActiveTcl's 8.5.2 code.)
Finally, I see no evidence that this is not specific to Mac OS X, and your
desired behaviour is still present on other Unix-alikes.
If you want the ability to start Tcl and not Tk on a CRAN build of R for
Mac OS X, I think you need to negotiate a way to do it as I believe it is
not intended to be available. But that's definitely an R-sig-mac topic.
On Sun, 4 May 2008, 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.
That message is only given if (src/library/tcltk/src/tcltk.c in both 2.6.2
and 2.7.0)
#if !defined(Win32) && !defined(HAVE_AQUA)
so your 2.6.x build appears not to have been defining HAVE_AQUA, which a
CRAN build would.
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 think it is coming from Tk_Init, at
code = Tk_Init(RTcl_interp); /* Load Tk into interpreter */
if (code != TCL_OK)
error(Tcl_GetStringResult(RTcl_interp));
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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