Seems like there are at least two packages for multiple assignment, maybe one of them solves your needs, zeallot and dub.
https://r-pkg.org/search.html?q=multiple+assignment Gabor On Tue, Oct 16, 2018 at 12:03 AM Abs Spurdle <spurdl...@gmail.com> wrote: > > Kia Ora > > > Although I'm not sure what problem it would solve... > > Given that you asked, I was interested in writing a multiple assignment > function as a replacement function, so something like: > massign (x, y, z) = construct.some list () > > Obviously, that's not possible. > > Probably the best example I can think of is converting cartesian > coordinates to polar coordinates. > Then we might have something like (note, untested, written in my email): > cart2polar = function (x, y) > list (theta=atan (y / x), r=sqrt (x * x + y * y) ) > > massign (r, theta) = cart2polar (x, y) > > Now, I'm considering a multiple assignment operator, so something like: > c (theta, r) $<-$ cart2polar (x, y) > > And while we're on the topic, I'm also considering an attribute operator > (to access object attributes), something like: > myobject%$%myattribute > > This would be similar to . in C++/Java or @ in S4. > And seems like something obvious that's missing from R. > > Implementing an attribute read this way is easy, however, implementing an > attribute assignment this way (without language level support) is difficult. > > > kind regards > Abs > > [[alternative HTML version deleted]] > > ______________________________________________ > R-devel@r-project.org mailing list > https://stat.ethz.ch/mailman/listinfo/r-devel ______________________________________________ R-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel
