I'm trying to learn about the tcltk package and its uses. Floundering
around a bit ... Have discovered Peter Dalgaard's articles in R-News,
which should help. Also James Wettenhall's suite of examples look like
they might be enlightening, even though the indications are that they
are
Windoze oriented.
Be that as it were, I decided to fool around a bit with Tcl/Tk *outside*
of R to see if I could get the hang of just what Tcl/Tk actually is.
(As I said I am floundering; I can't seem to get a conceptual grip on
what it's all about.) I discovered a Tcl/Tk ``Cookbook'' by Sastry
and Sastry that looked promising. URL:
http://www.dci.clrc.ac.uk/Publications/Cookbook/
Tried the first couple of (ultra-simple) examples and they seemed to
work.
(Amazing, for me.)
Then I tried the example on creating an executable file for invoking
the Tcl/Tk commands. The instructions said to create a file
``button.tcl'' with a first line
#!/usr/bin/wish
and succeeding lines
button .b -text "Press Me" -command exit
pack .b
I did this, did a chmod to make the file executable, and then typed
button.tcl
at the command line prompt. I got the error messages
tcsh: button: Command not found.
tcsh: pack: Command not found.
So the code at the beginning of the script telling the machine
to use the ``wi'' shell (rather than tcsh) is being ignored.
Why?
The Tcl/Tk executables really are in /usr/bin.
If I invoke ``wish'' interactively, and then type in the ``succeeding
lines''
interactively the ``Press Me'' button pops up as it should. (And
goes away
when I click on it.)
Also if I type ``wish button.tcl'' then it seems to work; i.e. the
button
pops up and goes away when clicked.
Can anyone give me a hint as to why it doesn't work when the the
executable
script is invoked directly (from tcsh)? Other than the fact that I'm
using a Mac :-) .
[Invoking unname -a gives ``Darwin TURNER-ROLF.local 8.11.1 Darwin
Kernel
Version 8.11.1: Wed Oct 10 18:23:28 PDT 2007; root:xnu-792.25.20~1/
RELEASE_I386 i386 i386''.]
The Tcl/Tk software, from what I can glean, appears to be version 8.4
(???).
Thanks for any insights.
cheers,
Rolf Turner
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