Hello all, In attempting to create a one-sided formula from a two-sided formula, I discovered that the following syntax will successfully complete this operation:
> f <- y ~ x + z > f[2] <- NULL > f ~x + z > str(f) Class 'formula' language ~x + z ..- attr(*, ".Environment")=<environment: R_GlobalEnv> In searching through the formula documentation, I couldn't find this technique as documented and wondered whether or not it is expected and if it makes sense to develop a package against the behavior. I'm using R 4.1.0, but I see the same on R-devel (r81303). I asked on Twitter, but someone thought this list might be a better venue. Apologies if I missed some documentation and thanks in advance. Cheers, Matt ~~~~~~~~~~ Matthew Blackwell Associate Professor of Government Harvard University https://www.mattblackwell.org ______________________________________________ R-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel
