On Nov 9, 2012, at 9:46 PM, Hadley Wickham wrote: > On Friday, November 9, 2012, Simon Urbanek wrote: > > On Nov 9, 2012, at 8:00 AM, Hadley Wickham wrote: > > >>> 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, > > No elements are copied - this is a subassignment and it is done in place > hence there is neither duplication nor copying - simply the value of the 11th > element is changed. > > But there was no 11th element - it was only 10 long. >
Ah, I see what you mean - the misleading part is rather that x is now a new object that is no longer traced - this is not about duplication or copying. Cheers, Simon ______________________________________________ R-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel
