[R] What does the "<<-" operator mean?

[Liviu Andronic]

On Thu, Apr 21, 2011 at 9:59 PM, Thomas Lumley <tlumley at uw.edu> wrote:
> The Evil and Wrong use is to modify variables in the global environment.
>
I'm a bit at a loss. Why is it so wrong and evil? In other words, how
should one modify variables in the global environment? Through the use
of return()?

Regards
Liviu