Tcl/Tk GUI Example with Variable Input by User

August 11, 2012

(This article was first published on theBioBucket*, and kindly contributed to R-bloggers)

I recently used R with GUI-elements for the first time and browsed through the available online resources, but I didn’t quite find what I was searching for: The user should be able to put in some variables and call a function with a button. In the end I did it with a little help from SO. Here is the working example that I eventually plugged together:


mydialog <- function(){

       xvar <- tclVar("")
       yvar <- tclVar("")
       zvar <- tclVar("")

       tt <- tktoplevel()
       x.entry <- tkentry(tt, textvariable=xvar)
       y.entry <- tkentry(tt, textvariable=yvar)
       z.entry <- tkentry(tt, textvariable=zvar)

       reset <- function() {

       reset.but <- tkbutton(tt, text="Reset", command=reset)

       submit <- function() {
         x <- as.numeric(tclvalue(xvar))
         y <- as.numeric(tclvalue(yvar))
         z <- as.numeric(tclvalue(zvar))
         tkmessageBox(message=paste("x + y + z = ", x+y+z, ""))
       submit.but <- tkbutton(tt, text="submit", command=submit)
       quit.but <- tkbutton(tt, text = "Close Session",
           command = function() {
           q(save = "no")

       tkgrid(tklabel(tt,text="Put your variables.."),columnspan=3, pady = 10)
       tkgrid(tklabel(tt,text="x variable"), x.entry, pady= 10, padx= 10)
       tkgrid(tklabel(tt,text="y variable"), y.entry, pady= 10, padx= 10)
       tkgrid(tklabel(tt,text="z variable"), z.entry, pady= 10, padx= 10)
       tkgrid(submit.but, reset.but, quit.but, pady= 10, padx= 10)



To leave a comment for the author, please follow the link and comment on their blog: theBioBucket*. offers daily e-mail updates about R news and tutorials on topics such as: Data science, Big Data, R jobs, visualization (ggplot2, Boxplots, maps, animation), programming (RStudio, Sweave, LaTeX, SQL, Eclipse, git, hadoop, Web Scraping) statistics (regression, PCA, time series, trading) and more...

If you got this far, why not subscribe for updates from the site? Choose your flavor: e-mail, twitter, RSS, or facebook...

Comments are closed.


Mango solutions

plotly webpage

dominolab webpage

Zero Inflated Models and Generalized Linear Mixed Models with R

Quantide: statistical consulting and training




CRC R books series

Six Sigma Online Training

Contact us if you wish to help support R-bloggers, and place your banner here.

Never miss an update!
Subscribe to R-bloggers to receive
e-mails with the latest R posts.
(You will not see this message again.)

Click here to close (This popup will not appear again)