[R] Controlling visibility of top-level functions

Greg Snow 538280 at gmail.com
Mon Feb 3 23:29:06 CET 2014

One option that I have not seen mentioned yet, and may be the most
similar to the Python approach is to name the "Invisible" function
starting with a "." (the period).  Then the function will not appear
when you do `ls()` but is still accessible.  It however is not limited
in scope and it is still callable by anyone (and `ls(all=TRUE)` will
show it).  This does not give the control that packages or local
environments do, but it is a quick and easy way to have something that

On Fri, Jan 31, 2014 at 11:46 AM, Paul A. Steckler <steck at stecksoft.com> wrote:
> I'm fairly new to R, and have checked the R FAQ and done an RSiteSearch for help
> on this topic, to no avail.
> I want to write some R code that has functions at the top-level that
> are not visible when
> the code is loaded. So in
>   fun1 <- function(...)  { ... }
>   fun2 <- function(...)  { ... fun1 ...}
> I'd like fun2 to be callable, but have fun1 be invisible. That is, the
> scope of fun1 is
> limited to the file in which it's defined.
> In Python, I believe that prepending an underscore to a variable name
> limits its scope in this way.
> Is there a similar mechanism in R?
> -- Paul
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Gregory (Greg) L. Snow Ph.D.
538280 at gmail.com

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