Hi Adrian, I had the same thought as Luke. It is possible that you can develop an ALTREP that carries around the tagging information you're looking for in a way that is more persistent (in some cases) than R-level attributes and more hidden than additional user-visible columns.
The downsides to this, of course, is that you'll in some sense be doing the same "extra vector for each vector you want tagged NA-s within" under the hood, and that only custom machinery you write will recognize things as something other than bog-standard NAs/NaNs. You'll also have some problems with the fact that data in ALTREPs isn't currently modifiable without losing ALTREPness. That said, ALTREPs are allowed to carry around arbitrary persistent information with them, so from that perspective making an ALTREP that carries around a "meaning of my NAs" vector of tags in its metadata would be pretty straightforward. Best, ~G On Mon, May 24, 2021 at 7:30 AM Adrian Dușa <dusa.adr...@gmail.com> wrote: > Hi Taras, > > On Mon, May 24, 2021 at 4:20 PM Taras Zakharko <taras.zakha...@uzh.ch> > wrote: > > > Hi Adrian, > > > > Have a look at vctrs package — they have low-level primitives that might > > simplify your life a bit. I think you can get quite far by creating a > > custom type that stores NAs in an attribute and utilizes vctrs proxy > > functionality to preserve these attributes across different operations. > > Going that route will likely to give you a much more flexible and robust > > solution. > > > > Yes I am well aware of the primitives from package vctrs, since package > haven itself uses the vctrs_vctr class. > They're doing a very interesting work, albeit not a solution for this > particular problem. > > A. > > [[alternative HTML version deleted]] > > ______________________________________________ > R-devel@r-project.org mailing list > https://stat.ethz.ch/mailman/listinfo/r-devel > [[alternative HTML version deleted]] ______________________________________________ R-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel
