How do you use “<<-” (scoping assignment) in R?

Question

I just finished reading about scoping in the R intro, and am very curious about the <<- assignment.

The manual showed one (very interesting) examp

Answer 1

One place where I used <<- was in simple GUIs using tcl/tk. Some of the initial examples have it -- as you need to make a distinction between local and global variables for statefullness. See for example

 library(tcltk)
 demo(tkdensity)

which uses <<-. Otherwise I concur with Marek :) -- a Google search can help.