[R] tcltk package functionality

Peter Dalgaard BSA p.dalgaard at biostat.ku.dk
Thu Sep 28 20:38:47 CEST 2000

"Anantha Prasad/NE/USDAFS" <aprasad at fs.fed.us> writes:

> Hello,
> I wrote a function in R which uses tcltk package .... essentially I wanted
> to give within that function, a widget with 2 radiobuttons to choose
> between plotting Precip and Temperature plots. After the user has chosen
> one of the radiobuttons there is another widget that asking him to identify
> outliers. However, I am having a lot of problems...what R does is evaluate
> the whole function without pausing...if I introduce a while() loop as I
> have in the example below, R does nothing until I hit cntrl-c upon which it
> shows the widget and comes out of the function......I could use a while
> loop in S-PLUS using the dialog.create() dialog.display() functions, but I
> cannot seem to implement that functionality in R.....what am I doing wrong?
> I enclose below the sample function...Any help will be greatly
> appreciated....

Did you take a look at the tkttest demo? (esp. the tkwait.variable

The tcltk event loop runs off of the input handler and is not happy if
R gets caught in a tight loop (this might change later on, and the
Windows port already has some code to avoid this).

   O__  ---- Peter Dalgaard             Blegdamsvej 3  
  c/ /'_ --- Dept. of Biostatistics     2200 Cph. N   
 (*) \(*) -- University of Copenhagen   Denmark      Ph: (+45) 35327918
~~~~~~~~~~ - (p.dalgaard at biostat.ku.dk)             FAX: (+45) 35327907
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