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

Hadley Wickham h.wickham at gmail.com
Fri Nov 9 14:00:46 CET 2012

>> 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
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.


RStudio / Rice University

More information about the R-devel mailing list