As a hack you could do this... assign("=", assign2)
Michael On 11 November 2010 21:30, Barry Rowlingson <b.rowling...@lancaster.ac.uk> wrote: > On Thu, Nov 11, 2010 at 9:37 AM, Tal Galili <tal.gal...@gmail.com> wrote: > >> 4) My real intention is to somehow change the "<-" operator (not simply the >> assign). I am unsure as to how to do that. >> 5) Are there any major pros/cons to the adding of such meta-data to objects? >> (for example, excessive overhead on memory/performance) > > I had a go at doing (4) a few years back. The major problem I had was > that if you do: > > y <- 1:10 > x <- y > > with a <- operator that sets a timestamp then: > > identical(x,y) is FALSE. > > I implemented timestamping by adding an attribute to objects during > assigment by modifying the C source, and then lots and lots of R's > tests failed during build because identical things were no longer > identical. > > Might be better to store your metadata in a separate object, .metadata > in the global env perhaps? Then just do: > > .metadata[[name_of_thing]] = list(modified=Sys.time()) > > in your modified assign. > > Performance will only be a problem if your program is doing nothing > else except fiddle with metadata, I reckon. Your program does do > something useful, doesn't it? > > Barry > > ______________________________________________ > R-help@r-project.org mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide http://www.R-project.org/posting-guide.html > and provide commented, minimal, self-contained, reproducible code. > ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.