[Rd] built-in NAMED(obj) from within R

[Hadley Wickham]

>> The goal is to ascertain whether a copy of an object has been made.
>
> Then :
>
>     ?tracemem
>
> One demonstration of using both together is here :
>
>     http://stackoverflow.com/a/10312843/403310

Note that tracemem detects duplications (in a technical R sense), not
copies - i.e.

x <- 1:10
tracemem(x)
x[11] <- 11L

although all the individual elements are copied, the vector is not
duplicated.  This confused me at first, so I thought I'd point it out.

Hadley

-- 
RStudio / Rice University
http://had.co.nz/